40 files changed, 1715 insertions, 748 deletions

diff --git a/.github/release.yaml b/.github/release.yaml
new file mode 100644
index 0000000000..0f4884c944
--- /dev/null
+++ b/.github/release.yaml
@@ -0,0 +1,18 @@
+changelog:

+  exclude:

+    labels:

+      - ignore-for-release

+    authors:

+      - dependabot 

+  categories:

+    - title: Breaking Changes 🛠

+      labels:

+        - semver-major

+        - breaking-change

+    - title: New Features 🎉

+      labels:

+        - semver-minor

+        - enhancement

+    - title: Other Changes

+      labels:

+        - '*'

diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index a110c018ec..69a7e4b6a6 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -4,35 +4,67 @@ on:
   workflow_dispatch:
   pull_request:
   push:
-    branches: [main, contribute]
+    branches: [main, "actions*"]
     tags: ["*"]
 
 jobs:
   build:
     strategy:
       matrix:
-        runner: [windows-large]
-        configuration: [ReleaseOS]
-        addrsize: [64]
+        runner: [windows-large, macos-12-xl]
+        configuration: [Release, ReleaseOS]
+        python-version: ["3.11"]
         include:
-          - runner: windows-large
+          - runner: macos-12-xl
+            developer_dir: "/Applications/Xcode_14.0.1.app/Contents/Developer"
+        exclude:
+          - runner: macos-12-xl
             configuration: ReleaseOS
-            addrsize: 32
     runs-on: ${{ matrix.runner }}
+    outputs:
+      viewer_channel: ${{ steps.build.outputs.viewer_channel }}
+      viewer_version: ${{ steps.build.outputs.viewer_version }}
     env:
+      AUTOBUILD_ADDRSIZE: 64
+      AUTOBUILD_BUILD_ID: ${{ github.run_id }}
       AUTOBUILD_CONFIGURATION: ${{ matrix.configuration }}
-      AUTOBUILD_ADDRSIZE: ${{ matrix.addrsize }}
+      # authorizes fetching private constituent packages
+      AUTOBUILD_GITHUB_TOKEN: ${{ secrets.SHARED_AUTOBUILD_GITHUB_TOKEN }}
       AUTOBUILD_INSTALLABLE_CACHE: ${{ github.workspace }}/.autobuild-installables
       AUTOBUILD_VARIABLES_FILE: ${{ github.workspace }}/.build-variables/variables
-      AUTOBUILD_VSVER: "170" # vs2k22
-      LOGFAIL: debug # Show details when tests fail
+      AUTOBUILD_VSVER: "170"
+      DEVELOPER_DIR: ${{ matrix.developer_dir }}
+      # Ensure that viewer builds engage Bugsplat.
+      BUGSPLAT_DB: "SecondLife_Viewer_2018"
+      BUGSPLAT_PASS: ${{ secrets.BUGSPLAT_PASS }}
+      BUGSPLAT_USER: ${{ secrets.BUGSPLAT_USER }}
+      build_coverity: false
+      build_log_dir: ${{ github.workspace }}/.logs
+      build_viewer: true
+      BUILDSCRIPTS_SHARED: ${{ github.workspace }}/.shared
+      # extracted and committed to viewer repo
+      BUILDSCRIPTS_SUPPORT_FUNCTIONS: ${{ github.workspace }}/buildscripts_support_functions
       GIT_REF: ${{ github.head_ref || github.ref }}
+      LL_SKIP_REQUIRE_SYSROOT: 1
+      # Setting this variable directs Linden's TUT test driver code to capture
+      # test-program log output at the specified level, but to display it only if
+      # the individual test fails.
+      LOGFAIL: DEBUG
+      master_message_template_checkout: ${{ github.workspace }}/.master-message-template
+      # Only set variants to the one configuration: don't let build.sh loop
+      # over variants, let GitHub distribute variants over multiple hosts.
+      variants: ${{ matrix.configuration }}
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
         with:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
 
+      - name: Setup python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+
       - name: Checkout build variables
         uses: actions/checkout@v3
         with:
@@ -40,8 +72,14 @@ jobs:
           ref: viewer
           path: .build-variables
 
+      - name: Checkout master-message-template
+        uses: actions/checkout@v3
+        with:
+          repository: secondlife/master-message-template
+          path: .master-message-template
+
       - name: Install autobuild and python dependencies
-        run: pip3 install autobuild llbase
+        run: pip3 install autobuild llsd
 
       - name: Cache autobuild packages
         uses: actions/cache@v3
@@ -63,31 +101,224 @@ jobs:
         env:
           RUNNER_OS: ${{ runner.os }}
         run: |
+          # set up things the viewer's build.sh script expects
+          set -x
+          mkdir -p "$build_log_dir"
+          mkdir -p "$BUILDSCRIPTS_SHARED/packages/lib/python"
+          source "$BUILDSCRIPTS_SUPPORT_FUNCTIONS"
+          if [[ "$OSTYPE" =~ cygwin|msys ]]
+          then
+            native_path() { cygpath --windows "$1"; }
+            shell_path()  { cygpath --unix "$1"; }
+          else
+            native_path() { echo "$1"; }
+            shell_path()  { echo "$1"; }
+          fi
+          finalize()
+          {
+            case "$1" in
+              true|0)
+                record_success "Build Succeeded"
+                ;;
+              *)
+                record_failure "Build Failed with $1"
+                ;;
+            esac
+          }
+          initialize_build()
+          {
+            echo "initialize_build"
+          }
+          initialize_version()
+          {
+            export revision="$AUTOBUILD_BUILD_ID"
+          }
+          python_cmd()
+          {
+              if [[ "x${1:0:1}" == "x-" ]]    # -m, -c, etc.
+              then # if $1 is a switch, don't try to twiddle paths
+                   "$(shell_path "$PYTHON_COMMAND")" "$@"
+              elif [[ "$(basename "$1")" == "codeticket.py" ]]
+              then # ignore any attempt to contact codeticket
+                   echo "## $@"
+              else # running a script at an explicit path: fix path for Python
+                   local script="$1"
+                   shift
+                   "$(shell_path "$PYTHON_COMMAND")" "$(native_path "$script")" "$@"
+              fi
+          }
+          repo_branch()
+          {
+            git -C "$1" branch | grep '^* ' | cut -c 3-
+          }
+          record_dependencies_graph()
+          {
+            echo "TODO: generate and post dependency graph"
+          }
+          # Since we're not uploading to codeticket, DO NOT sleep for minutes.
+          sleep()
+          {
+            echo "Not sleeping for $1 seconds"
+          }
+          export -f native_path shell_path finalize initialize_build initialize_version
+          export -f python_cmd repo_branch record_dependencies_graph sleep
+          ## Useful for diagnosing Windows LLProcess/LLLeap test failures
+          ##export APR_LOG="${RUNNER_TEMP}/apr.log"
+          export arch=$(uname | cut -b-6)
+          # Surprise! GH Windows runner's MINGW6 is a $arch value we've never
+          # seen before, so numerous tests don't know about it.
+          [[ "$arch" == "MINGW6" ]] && arch=CYGWIN
+          export AUTOBUILD="$(which autobuild)"
+          # Build with a tag like "Second_Life_Project_Shiny#abcdef0" to get a
+          # viewer channel "Second Life Project Shiny" (ignoring "#hash",
+          # needed to disambiguate tags).
+          if [[ "$GITHUB_REF_TYPE" == "tag" && "${GITHUB_REF_NAME:0:12}" == "Second_Life_" ]]
+          then viewer_channel="${GITHUB_REF_NAME%#*}"
+               export viewer_channel="${viewer_channel//_/ }"
+          else export viewer_channel="Second Life Test"
+          fi
+          echo "viewer_channel=$viewer_channel" >> "$GITHUB_OUTPUT"
+
           # On windows we need to point the build to the correct python
           # as neither CMake's FindPython nor our custom Python.cmake module
           # will resolve the correct interpreter location.
           if [[ "$RUNNER_OS" == "Windows" ]]; then
-            export PYTHON="$(cygpath -m "$(which python)")"
+            export PYTHON="$(native_path "$(which python)")"
             echo "Python location: $PYTHON"
+            export PYTHON_COMMAND="$PYTHON"
+          else
+            export PYTHON_COMMAND="python3"
           fi
-          
-          autobuild configure -- -DVIEWER_CHANNEL="Second Life Test ${GIT_REF##*/}"
-          autobuild  build --no-configure
+          export PYTHON_COMMAND_NATIVE="$(native_path "$PYTHON_COMMAND")"
 
-          # Find artifacts
-          if [[ "$RUNNER_OS" == "Windows" ]]; then
-            installer_path=$(find ./build-*/newview/ | grep '_Setup\.exe')
-            installer_name="$(basename $installer_path)"
-          elif [[ "$RUNNER_OS" == "macOS" ]]; then
-            installer_path=$(find ./build-*/newview/ | grep '\.dmg')
-            installer_name="$(basename $installer_path)"
-          fi
+          ./build.sh
+
+          # Each artifact is downloaded as a distinct .zip file. Multiple jobs
+          # (per the matrix above) writing the same filepath to the same
+          # artifact name will *overwrite* that file. Moreover, they can
+          # interfere with each other, causing the upload to fail.
+          # https://github.com/actions/upload-artifact#uploading-to-the-same-artifact
+          # Given the size of our installers, and the fact that we typically
+          # only want to download just one instead of a single zip containing
+          # several, generate a distinct artifact name for each installer.
+          # If the matrix above can run multiple builds on the same
+          # platform, we must disambiguate on more than the platform name.
+          # e.g. if we were still running Windows 32-bit builds, we'd need to
+          # qualify the artifact with bit width.
+          echo "artifact=$RUNNER_OS" >> $GITHUB_OUTPUT
 
-          echo "installer_path=$installer_path" >> $GITHUB_OUTPUT
-          echo "installer_name=$installer_name" >> $GITHUB_OUTPUT
-      
       - name: Upload installer
         uses: actions/upload-artifact@v3
         with:
-          name: ${{ steps.build.outputs.installer_name }}
-          path: ${{ steps.build.outputs.installer_path }}
+          name: "${{ steps.build.outputs.artifact }}-installer"
+          # emitted by build.sh, possibly multiple lines
+          path: |
+            ${{ steps.build.outputs.installer }}
+
+      - name: Upload executable
+        if: steps.build.outputs.viewer_exe
+        uses: actions/upload-artifact@v3
+        with:
+          name: "${{ steps.build.outputs.artifact }}-exe"
+          path: ${{ steps.build.outputs.viewer_exe }}
+
+      # The other upload of nontrivial size is the symbol file. Use a distinct
+      # artifact for that too.
+      - name: Upload symbol file
+        uses: actions/upload-artifact@v3
+        with:
+          name: "${{ steps.build.outputs.artifact }}-symbols"
+          path: |
+            ${{ steps.build.outputs.symbolfile }}
+
+      - name: Upload metadata
+        uses: actions/upload-artifact@v3
+        with:
+          # Call this artifact just "Windows" or "macOS" because it's the only
+          # artifact in which we expect files from both platforms with
+          # colliding names (e.g. autobuild-package.xml). Our flatten_files.py
+          # (see release step) resolves collisions by prepending the artifact
+          # name, so when we anticipate collisions, it's good to keep the
+          # artifact name short and sweet.
+          name: "${{ steps.build.outputs.artifact }}"
+          # emitted by build.sh, possibly multiple lines
+          path: |
+            ${{ steps.build.outputs.metadata }}
+
+      - name: Upload physics package
+        uses: actions/upload-artifact@v3
+        # should only be set for viewer-private
+        if: steps.build.outputs.physicstpv
+        with:
+          name: "${{ steps.build.outputs.artifact }}-physics"
+          # emitted by build.sh, zero or one lines
+          path: |
+            ${{ steps.build.outputs.physicstpv }}
+
+  post-windows-symbols:
+    needs: build
+    runs-on: windows
+    steps:
+      - name: Post Windows symbols
+        uses: secondlife/viewer-post-bugsplat-windows@main
+        with:
+          username: ${{ secrets.BUGSPLAT_USER }}
+          password: ${{ secrets.BUGSPLAT_PASS }}
+          database: "SecondLife_Viewer_2018"
+          channel: ${{ needs.build.outputs.viewer_channel }}
+          version: ${{ needs.build.outputs.viewer_version }}
+
+  post-mac-symbols:
+    needs: build
+    runs-on: macos-latest
+    steps:
+      - name: Post Mac symbols
+        uses: secondlife/viewer-post-bugsplat-mac@main
+        with:
+          username: ${{ secrets.BUGSPLAT_USER }}
+          password: ${{ secrets.BUGSPLAT_PASS }}
+          database: "SecondLife_Viewer_2018"
+          channel: ${{ needs.build.outputs.viewer_channel }}
+          version: ${{ needs.build.outputs.viewer_version }}
+
+  release:
+    needs: build
+    runs-on: ubuntu-latest
+    if: github.ref_type == 'tag' && startsWith(github.ref_name, 'Second_Life_')
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ github.sha }}
+
+      - name: Setup python
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.11"
+
+##    - name: Install PyGithub
+##      run: pip3 install PyGithub
+##
+##    - name: Unpack artifacts
+##      env:
+##        BUILD: ${{ toJSON(needs.build) }}
+##      run: .github/workflows/post_artifacts.py
+
+      - uses: actions/download-artifact@v3
+        with:
+          path: artifacts
+
+      - name: Show what we downloaded
+        run: ls -R artifacts
+
+      - name: Reshuffle artifact files
+        run: .github/workflows/flatten_files.py assets artifacts
+
+      # forked from softprops/action-gh-release
+      - uses: secondlife-3p/action-gh-release@v1
+        with:
+          prerelease: true
+          generate_release_notes: true
+          # the only reason we generate a GH release is to post build products
+          fail_on_unmatched_files: true
+          files: "assets/*"
diff --git a/.github/workflows/flatten_files.py b/.github/workflows/flatten_files.py
new file mode 100755
index 0000000000..542fa0206b
--- /dev/null
+++ b/.github/workflows/flatten_files.py
@@ -0,0 +1,180 @@
+#!/usr/bin/env python3
+"""\
+@file   flatten_files.py
+@author Nat Goodspeed
+@date   2023-08-18
+@brief  From an input directory tree, populate a single flat output directory.
+
+$LicenseInfo:firstyear=2023&license=viewerlgpl$
+Copyright (c) 2023, Linden Research, Inc.
+$/LicenseInfo$
+"""
+
+DESCRIPTION = """\
+From an input directory tree, populate a single flat output directory.
+
+For files with colliding names, rename them to unambiguous names derived from
+their relative pathname within the input tree.
+
+This is useful when downloading GitHub build artifacts from multiple platforms
+to post them all as release assets without collisions.
+"""
+
+from collections import defaultdict
+from contextlib import suppress
+import filecmp
+import os
+from pathlib import Path
+import sys
+
+class Error(Exception):
+    pass
+
+def flatten(output, input='.', dry_run=False):
+    try:
+        in_stat = os.stat(input)
+    except FileNotFoundError as err:
+        raise Error(f'{input} does not exist') from err
+
+    try:
+        out_stat = os.stat(output)
+    except FileNotFoundError:
+        # output doesn't yet exist - at this point that's okay
+        out_stat = None
+
+    # use samestat() to avoid being fooled by different ways of expressing the
+    # same path
+    if out_stat and os.path.samestat(out_stat, in_stat):
+        # output directory same as input: in this case, don't prune output
+        # directory from input tree walk because we'd prune everything
+        out_stat = None
+    elif out_stat:
+        # distinct existing output directory (potentially containing, or
+        # contained by, the input directory)
+        outfiles = [f for f in Path(output).rglob('*') if f.is_file()]
+        if outfiles:
+            print(f'Warning: {output} already contains {len(outfiles)} files:', file=sys.stderr)
+            for f in sorted(outfiles):
+                print('  ', f.relative_to(output), file=sys.stderr)
+
+    # Use os.walk() instead of Path.rglob() so we can prune unwanted
+    # directories.
+    infiles = []
+    for parent, dirs, files in os.walk(input):
+        infiles.extend(Path(parent, f) for f in files)
+        # Prune directories: because we must modify the dirs list in-place,
+        # and because we're using indexes, traverse backwards so deletion
+        # won't affect subsequent iterations. Yes we really must subtract 1
+        # that many times.
+        for idx in range(len(dirs)-1, -1, -1):
+            if dirs[idx].startswith('.'):
+                # skip dot-named directories
+                print(f'ignoring {dirs[idx]}', file=sys.stderr)
+                del dirs[idx]
+            elif out_stat and os.path.samestat(os.stat(os.path.join(parent, dirs[idx])), out_stat):
+                # output directory lives under input directory: ignore any
+                # previous contents
+                print(f'ignoring nested output directory {os.path.join(parent, dirs[idx])}',
+                      file=sys.stderr)
+                del dirs[idx]
+
+    # Now that we've traversed the input tree, create the output directory if
+    # needed.
+    output = Path(output)
+    output.mkdir(parents=True, exist_ok=True)
+
+    # group files by basename to identify collisions
+    basenames = defaultdict(list)
+    for f in infiles:
+        basenames[f.name].append(f)
+
+    # output names: populate it right away with unique basenames
+    outnames = { name: files[0] for name, files in basenames.items()
+                 if len(files) == 1 }
+
+    # now focus on the collisions
+    for name, files in basenames.items():
+        if len(files) <= 1:
+            continue
+
+        # Special case: are these colliding files equal? e.g. viewer_version.txt
+        # Pass shallow=False so we actually read the files in question. Even
+        # if they're identical, they've been downloaded from different
+        # artifacts and have different timestamps (which would fool the default
+        # shallow=True). This could be time-consuming if we were comparing two
+        # of our very large files, but (a) our very large files already have
+        # distinct names and so don't reach this call and (b) if we somehow do
+        # wind up in that situation, it would be even more important to post
+        # only a single copy.
+        if all(filecmp.cmp(files[0], f, shallow=False) for f in files[1:]):
+            # pick only one of them and use its simple basename
+            outnames[name] = files[0]
+            continue
+
+        # Because of our intended use for GitHub Actions build artifacts, we
+        # assume the top-level artifact names are descriptive. We'd still like
+        # to eliminate mid-level directory names that don't help disambiguate,
+        # so for instance, given:
+        # Windows metadata/newview/viewer_version.txt
+        # macOS metadata/newview/viewer_version.txt
+        # we see no reason to retain the 'newview' pathname component. Try
+        # longer and longer prefixes of the pathname parents. (But don't
+        # forget to trim off the original input directory pathname.)
+        filepairs = [(f, f.relative_to(input)) for f in files]
+        partslen = max(len(rel.parts) for f, rel in filepairs)
+        # skip the basename itself, we'll append that explicitly
+        for prefixlen in range(partslen - 1):
+            # Consider these relative names (shouldn't occur, but...):
+            # parent/autobuild-package.xml
+            # parent/newview/autobuild-package.xml
+            # Unless these are in fact identical, they'll collide, meaning
+            # we'll see them here. But beware their unequal numbers of parts.
+            # partslen will be 3, so prefixlen will be 0, 1 -- but unless we
+            # constrain it with min(), for prefixlen == 1 we'd construct:
+            # ('parent', 'autobuild-package.xml', 'autobuild-package.xml')
+            # ('parent', 'newview', 'autobuild-package.xml')
+            # whereas of course the correct answer would be:
+            # ('parent', 'autobuild-package.xml')
+            # ('parent', 'newview', 'autobuild-package.xml')
+            # Since we already know the basename is identical for every f in
+            # files, though, we can omit it from our uniqueness testing.
+            trynames = { rel.parts[:min(prefixlen+1, len(rel.parts)-1)]: f
+                         for f, rel in filepairs }
+            if len(trynames) == len(files):
+                # Found a prefix without collisions -- note that we're
+                # guaranteed to get here eventually since the full paths are
+                # distinct in the filesystem, we just want to try to shorten.
+                # Path.parts is specifically documented to be a tuple. Join
+                # the key tuple with some delimiter acceptable to the
+                # filesystem.
+                outnames.update(('-'.join(nametuple + (name,)), f)
+                                for nametuple, f in trynames.items())
+                # stop considering longer prefixlens
+                break
+
+    # at this point outnames should have distinct keys -- move to the output
+    # directory
+    for name, f in outnames.items():
+        newname = output / name
+        if (not dry_run) and newname != f:
+            newname = f.rename(newname)
+        print(f'{f} => {newname}')
+
+def main(*raw_args):
+    from argparse import ArgumentParser
+    parser = ArgumentParser(description=DESCRIPTION)
+    parser.add_argument('-n', '--dry-run', action='store_true', default=False,
+                        help="""show what would happen without moving files""")
+    parser.add_argument('output', metavar='OUTDIR',
+                        help="""populate OUTDIR with (possibly renamed) files""")
+    parser.add_argument('input', metavar='INDIR', nargs='?', default='.',
+                        help="""recursively read files under INDIR tree""")
+
+    args = parser.parse_args(raw_args)
+    flatten(args.output, args.input, dry_run=args.dry_run)
+
+if __name__ == "__main__":
+    try:
+        sys.exit(main(*sys.argv[1:]))
+    except Error as err:
+        sys.exit(str(err))
diff --git a/.gitignore b/.gitignore
index 80eca667df..f0b5f86211 100755
--- a/.gitignore
+++ b/.gitignore
@@ -73,4 +73,6 @@ tarfile_tmp
 trivial_change_force_build
 web/config.*
 web/locale.*
-web/secondlife.com.*
\ No newline at end of file
+web/secondlife.com.*
+
+.env
diff --git a/autobuild.xml b/autobuild.xml
index 9785884a40..9f6913c9de 100644
--- a/autobuild.xml
+++ b/autobuild.xml
@@ -52,9 +52,11 @@
             <key>archive</key>
             <map>
               <key>hash</key>
-              <string>178b16ee9ff67986c8c14413ee68218e</string>
+              <string>dc4a38439f90325b406ec3f7cc4fa66edf0eeec8</string>
+              <key>hash_algorithm</key>
+              <string>sha1</string>
               <key>url</key>
-              <string>https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/107593/938535/apr_suite-1.4.5.576669-darwin64-576669.tar.bz2</string>
+              <string>https://github.com/secondlife/3p-apr_suite/releases/download/v1.7.2-e935465/apr_suite-1.7.2-e935465-darwin64-e935465.tar.zst</string>
             </map>
             <key>name</key>
             <string>darwin64</string>
@@ -76,9 +78,11 @@
             <key>archive</key>
             <map>
               <key>hash</key>
-              <string>d2997cad03dbd0d70a060276b5671480</string>
+              <string>abb48e031b4bbab5fa48d2872ef2db065f33d8ac</string>
+              <key>hash_algorithm</key>
+              <string>sha1</string>
               <key>url</key>
-              <string>https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/107594/938548/apr_suite-1.4.5.576669-windows-576669.tar.bz2</string>
+              <string>https://github.com/secondlife/3p-apr_suite/releases/download/v1.7.2-e935465/apr_suite-1.7.2-e935465-windows-e935465.tar.zst</string>
             </map>
             <key>name</key>
             <string>windows</string>
@@ -88,16 +92,18 @@
             <key>archive</key>
             <map>
               <key>hash</key>
-              <string>ec24f5945faa8f13807b83eeaeb994f8</string>
+              <string>8233de9a11f323a03d569db1043ba5198176457b</string>
+              <key>hash_algorithm</key>
+              <string>sha1</string>
               <key>url</key>
-              <string>https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/107592/938547/apr_suite-1.4.5.576669-windows64-576669.tar.bz2</string>
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-              <string>https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/87776/805857/boost-1.72-darwin64-563847.tar.bz2</string>
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-              <string>https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/87784/805850/boost-1.72-windows-563847.tar.bz2</string>
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-              <string>https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/87783/805851/boost-1.72-windows64-563847.tar.bz2</string>
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-        <string>1.538984</string>
+        <string>None</string>
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@@ -769,6 +845,20 @@
         <string>glext</string>
         <key>platforms</key>
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-        <string>0.0.0</string>
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       <key>gstreamer</key>
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@@ -1027,10 +1133,14 @@
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             <string>darwin64</string>
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@@ -2015,7 +2255,7 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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         <string>hg</string>
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@@ -2048,16 +2290,18 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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+              <string>https://github.com/secondlife/3p-ogg_vorbis/releases/download/v1.3.3-1.3.6.e4101b6/ogg_vorbis-1.3.3-1.3.6.e4101b6-darwin64-e4101b6.tar.zst</string>
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-              <string>d4b8ed3fd679a2b484d2d1a66c063908</string>
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+              <string>https://github.com/secondlife/3p-ogg_vorbis/releases/download/v1.3.3-1.3.6.e4101b6/ogg_vorbis-1.3.3-1.3.6.e4101b6-windows-e4101b6.tar.zst</string>
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@@ -2114,16 +2362,18 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
             <key>archive</key>
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               <key>hash</key>
-              <string>ec4a657fe639bb458ee5132062146a7a</string>
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+              <string>https://github.com/secondlife/3p-ogg_vorbis/releases/download/v1.3.3-1.3.6.e4101b6/ogg_vorbis-1.3.3-1.3.6.e4101b6-windows64-e4101b6.tar.zst</string>
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@@ -2215,9 +2465,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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@@ -2227,9 +2479,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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-              <string>ac66f3197010b1549a5e4467aebbc27d</string>
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@@ -2239,9 +2493,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
             <key>archive</key>
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@@ -2251,16 +2507,18 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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               <key>hash</key>
-              <string>b95f0732f2388ebb0ddf33d4a30e0ff1</string>
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-        <string>2.5.0.575496</string>
+        <string>2.5.0.ea12248</string>
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@@ -2281,9 +2539,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
             <key>archive</key>
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@@ -2305,9 +2567,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
             <key>archive</key>
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               <key>hash</key>
-              <string>55bd833166d03f1467e2c7f24fa9143e</string>
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+              <string>https://github.com/secondlife/3p-openssl/releases/download/v1.1.1q.de53f55/openssl-1.1.1q.de53f55-windows-de53f55.tar.zst</string>
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@@ -2317,16 +2581,18 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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+              <string>https://github.com/secondlife/3p-openssl/releases/download/v1.1.1q.de53f55/openssl-1.1.1q.de53f55-windows64-de53f55.tar.zst</string>
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@@ -2347,9 +2613,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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+              <string>https://github.com/secondlife/3p-pcre/releases/download/v8.35.979fd86/pcre-8.35.979fd86-darwin64-979fd86.tar.zst</string>
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@@ -2371,9 +2639,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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-              <string>3660db45793df3050b63920bfb7d8479</string>
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@@ -2412,10 +2684,14 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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@@ -2436,10 +2712,14 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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@@ -2448,10 +2728,14 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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@@ -2477,9 +2761,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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@@ -2647,9 +2943,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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@@ -2659,9 +2957,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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@@ -2671,9 +2971,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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@@ -2701,13 +3003,29 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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             <string>darwin64</string>
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@@ -2720,13 +3038,27 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
             <key>name</key>
             <string>windows</string>
           </map>
+          <key>windows64</key>
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         <key>source</key>
         <string>https://bitbucket.org/lindenlab/vmp-standalone</string>
         <key>source_type</key>
         <string>hg</string>
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-        <string>3.0.580913</string>
+        <string>3.0.cc7ea1e</string>
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@@ -2745,9 +3077,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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+              <string>https://github.com/secondlife/3p-vlc-bin/releases/download/v3.0.16.c219a5d/vlc_bin-3.0.16.c219a5d-darwin64-c219a5d.tar.zst</string>
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@@ -2757,9 +3091,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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@@ -2769,16 +3105,18 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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         <key>copyright</key>
-        <string>Copyright 2012-2020 Yann Collet</string>
+        <string>Copyright (c) 2012-2021 Yann Collet</string>
         <key>description</key>
-        <string>xxHash Extremely fast hash algorithm</string>
+        <string>xxHash Library</string>
         <key>license</key>
-        <string>bsd</string>
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         <key>license_file</key>
         <string>LICENSES/xxhash.txt</string>
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@@ -2872,9 +3218,65 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
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             <string>common</string>
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+            <key>name</key>
+            <string>darwin64</string>
+          </map>
+          <key>linux64</key>
+          <map>
+            <key>archive</key>
+            <map>
+              <key>hash</key>
+              <string>7acb3f94a549fbb9bd7bc16604e34f33c5365a9b</string>
+              <key>hash_algorithm</key>
+              <string>sha1</string>
+              <key>url</key>
+              <string>https://github.com/secondlife/3p-xxhash/releases/download/v0.8.1.7501c90/xxhash-0.8.1.7501c90-linux64-7501c90.tar.zst</string>
+            </map>
+            <key>name</key>
+            <string>linux64</string>
+          </map>
+          <key>windows</key>
+          <map>
+            <key>archive</key>
+            <map>
+              <key>hash</key>
+              <string>8ac856ef69a7395c3b70c3fcc1edb7f3f4194f92</string>
+              <key>hash_algorithm</key>
+              <string>sha1</string>
+              <key>url</key>
+              <string>https://github.com/secondlife/3p-xxhash/releases/download/v0.8.1.7501c90/xxhash-0.8.1.7501c90-windows-7501c90.tar.zst</string>
+            </map>
+            <key>name</key>
+            <string>windows</string>
+          </map>
+          <key>windows64</key>
+          <map>
+            <key>archive</key>
+            <map>
+              <key>hash</key>
+              <string>4522d075ea4703ef4b527c3039864ef735ea7953</string>
+              <key>hash_algorithm</key>
+              <string>sha1</string>
+              <key>url</key>
+              <string>https://github.com/secondlife/3p-xxhash/releases/download/v0.8.1.7501c90/xxhash-0.8.1.7501c90-windows64-7501c90.tar.zst</string>
+            </map>
+            <key>name</key>
+            <string>windows64</string>
+          </map>
         </map>
         <key>version</key>
-        <string>0.8.1</string>
+        <string>0.8.1.7501c90</string>
       </map>
       <key>zlib-ng</key>
       <map>
@@ -2897,9 +3299,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
             <key>archive</key>
             <map>
               <key>hash</key>
-              <string>bf306e38bf81c6095e0967bdef6a2445</string>
+              <string>dacc5f3fb307c4d1292ed1ffb1d595d83599062d</string>
+              <key>hash_algorithm</key>
+              <string>sha1</string>
               <key>url</key>
-              <string>https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/87759/805718/zlib_ng-2.0.5.563838-darwin64-563838.tar.bz2</string>
+              <string>https://github.com/secondlife/3p-zlib-ng/releases/download/v1.2.11.zlib-ng.32fd361/zlib_ng-1.2.11.zlib-ng.32fd361-darwin64-32fd361.tar.zst</string>
             </map>
             <key>name</key>
             <string>darwin64</string>
@@ -2909,9 +3313,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
             <key>archive</key>
             <map>
               <key>hash</key>
-              <string>dab6be8b0596c1e3354f2b6d41335131</string>
+              <string>fba88375e12454ae19f4528e11ffc7ddf7d879ec</string>
+              <key>hash_algorithm</key>
+              <string>sha1</string>
               <key>url</key>
-              <string>http://automated-builds-secondlife-com.s3.amazonaws.com/ct2/866/1898/zlib-1.2.8.500857-linux64-500857.tar.bz2</string>
+              <string>https://github.com/secondlife/3p-zlib-ng/releases/download/v1.2.11.zlib-ng.32fd361/zlib_ng-1.2.11.zlib-ng.32fd361-linux64-32fd361.tar.zst</string>
             </map>
             <key>name</key>
             <string>linux64</string>
@@ -2921,9 +3327,11 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
             <key>archive</key>
             <map>
               <key>hash</key>
-              <string>8ffce5bd00e3d5afa8cb39b855237c4a</string>
+              <string>2b5a50b0a3d31a07bc74cb77871ad195eb97c550</string>
+              <key>hash_algorithm</key>
+              <string>sha1</string>
               <key>url</key>
-              <string>https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/87761/805730/zlib_ng-2.0.5.563838-windows-563838.tar.bz2</string>
+              <string>https://github.com/secondlife/3p-zlib-ng/releases/download/v1.2.11.zlib-ng.32fd361/zlib_ng-1.2.11.zlib-ng.32fd361-windows-32fd361.tar.zst</string>
             </map>
             <key>name</key>
             <string>windows</string>
@@ -2933,16 +3341,18 @@ Copyright (c) 2012, 2014, 2015, 2016 nghttp2 contributors</string>
             <key>archive</key>
             <map>
               <key>hash</key>
-              <string>bd103a9129e57f7ea35886bc7750f8a6</string>
+              <string>ccfca9451063e2d0e95baa73b1ad2054d3e38907</string>
+              <key>hash_algorithm</key>
+              <string>sha1</string>
               <key>url</key>
-              <string>https://automated-builds-secondlife-com.s3.amazonaws.com/ct2/87760/805729/zlib_ng-2.0.5.563838-windows64-563838.tar.bz2</string>
+              <string>https://github.com/secondlife/3p-zlib-ng/releases/download/v1.2.11.zlib-ng.32fd361/zlib_ng-1.2.11.zlib-ng.32fd361-windows64-32fd361.tar.zst</string>
             </map>
             <key>name</key>
             <string>windows64</string>
           </map>
         </map>
         <key>version</key>
-        <string>2.0.5.563838</string>
+        <string>1.2.11.zlib-ng.32fd361</string>
       </map>
     </map>
     <key>package_description</key>
diff --git a/build.sh b/build.sh
index 89609a9ffd..6f74c64a39 100755
--- a/build.sh
+++ b/build.sh
@@ -16,6 +16,8 @@
 # * The special style in which python is invoked is intentional to permit
 #   use of a native python install on windows - which requires paths in DOS form
 
+cleanup="true"
+
 retry_cmd()
 {
     max_attempts="$1"; shift
@@ -110,6 +112,36 @@ installer_CYGWIN()
   fi
 }
 
+[[ -n "$GITHUB_OUTPUT" ]] || fatal "Need to export GITHUB_OUTPUT"
+# The following is based on the Warning for GitHub multiline output strings:
+# https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#multiline-strings
+EOF=$(dd if=/dev/urandom bs=15 count=1 status=none | base64)
+
+# Build up these arrays as we go
+installer=()
+metadata=()
+symbolfile=()
+physicstpv=()
+# and dump them to GITHUB_OUTPUT when done
+cleanup="$cleanup ; \
+arrayoutput installer ; \
+arrayoutput metadata ; \
+arrayoutput symbolfile ; \
+arrayoutput physicstpv"
+trap "$cleanup" EXIT
+
+arrayoutput()
+{
+    local outputname="$1"
+    # append "[*]" to the array name so array indirection works
+    local array="$1[*]"
+    local IFS='
+'
+    echo "$outputname<<$EOF
+${!array}
+$EOF" >> "$GITHUB_OUTPUT"
+}
+
 pre_build()
 {
   local variant="$1"
@@ -121,7 +153,7 @@ pre_build()
     RELEASE_CRASH_REPORTING=ON
     HAVOK=ON
     SIGNING=()
-    if [ "$arch" == "Darwin" -a "$variant" == "Release" ]
+    if [[ "$arch" == "Darwin" && "$variant" == "Release" ]]
     then SIGNING=("-DENABLE_SIGNING:BOOL=YES" \
                   "-DSIGNING_IDENTITY:STRING=Developer ID Application: Linden Research, Inc.")
     fi
@@ -145,15 +177,27 @@ pre_build()
         VIEWER_SYMBOL_FILE="$(native_path "$abs_build_dir/newview/$variant/secondlife-symbols-$symplat-${AUTOBUILD_ADDRSIZE}.tar.bz2")"
     fi
 
-    # don't spew credentials into build log
-    bugsplat_sh="$build_secrets_checkout/bugsplat/bugsplat.sh"
-    set +x
-    if [ -r "$bugsplat_sh" ]
-    then # show that we're doing this, just not the contents
-         echo source "$bugsplat_sh"
-         source "$bugsplat_sh"
+    # expect these variables to be set in the environment from GitHub secrets
+    if [[ -n "$BUGSPLAT_DB" ]]
+    then
+        # don't spew credentials into build log
+        set +x
+        if [[ -z "$BUGSPLAT_USER" || -z "$BUGSPLAT_PASS" ]]
+        then
+            # older mechanism involving build-secrets repo -
+            # if build_secrets_checkout isn't set, report its name
+            bugsplat_sh="${build_secrets_checkout:-\$build_secrets_checkout}/bugsplat/bugsplat.sh"
+            if [ -r "$bugsplat_sh" ]
+            then # show that we're doing this, just not the contents
+                echo source "$bugsplat_sh"
+                source "$bugsplat_sh"
+            else
+                fatal "BUGSPLAT_USER or BUGSPLAT_PASS missing, and no $bugsplat_sh"
+            fi
+        fi
+        set -x
+        export BUGSPLAT_USER BUGSPLAT_PASS
     fi
-    set -x
 
     # honor autobuild_configure_parameters same as sling-buildscripts
     eval_autobuild_configure_parameters=$(eval $(echo echo $autobuild_configure_parameters))
@@ -181,13 +225,17 @@ package_llphysicsextensions_tpv()
   # nat 2016-12-21: without HAVOK, can't build PhysicsExtensions_TPV.
   if [ "$variant" = "Release" -a "${HAVOK:-}" != "OFF" ]
   then 
-      test -r  "$build_dir/packages/llphysicsextensions/autobuild-tpv.xml" || fatal "No llphysicsextensions_tpv autobuild configuration found"
-      tpvconfig=$(native_path "$build_dir/packages/llphysicsextensions/autobuild-tpv.xml")
-      "$autobuild" build --quiet --config-file "$tpvconfig" -c Tpv || fatal "failed to build llphysicsextensions_tpv"
+      tpvconfig="$build_dir/packages/llphysicsextensions/autobuild-tpv.xml"
+      test -r "$tpvconfig" || fatal "No llphysicsextensions_tpv autobuild configuration found"
+      # SL-19942: autobuild ignores -c switch if AUTOBUILD_CONFIGURATION set
+      unset AUTOBUILD_CONFIGURATION
+      "$autobuild" build --quiet --config-file "$(native_path "$tpvconfig")" -c Tpv \
+          || fatal "failed to build llphysicsextensions_tpv"
       
       # capture the package file name for use in upload later...
       PKGTMP=`mktemp -t pgktpv.XXXXXX`
-      trap "rm $PKGTMP* 2>/dev/null" 0
+      cleanup="$cleanup ; rm $PKGTMP* 2>/dev/null"
+      trap "$cleanup" EXIT
       "$autobuild" package --quiet --config-file "$tpvconfig" --results-file "$(native_path $PKGTMP)" || fatal "failed to package llphysicsextensions_tpv"
       tpv_status=$?
       if [ -r "${PKGTMP}" ]
@@ -313,12 +361,20 @@ begin_section "coding policy check"
 # this far. Running coding policy checks on one platform *should* suffice...
 if [[ "$arch" == "Darwin" ]]
 then
-    # install the git-hooks dependencies
-    pip install -r "$(native_path "$git_hooks_checkout/requirements.txt")" || \
-        fatal "pip install git-hooks failed"
-    # validate the branch we're about to build
-    python_cmd "$git_hooks_checkout/coding_policy_git.py" --all_files || \
-        fatal "coding policy check failed"
+    git_hooks_reqs="$git_hooks_checkout/requirements.txt"
+    if [[ -r "$(shell_path "$git_hooks_reqs")" ]]
+    then
+        # install the git-hooks dependencies
+        pip install -r "$(native_path "$git_hooks_reqs")" || \
+            fatal "pip install git-hooks failed"
+    fi
+    git_hooks_script="$git_hooks_checkout/coding_policy_git.py"
+    if [[ -r "$(shell_path "$git_hooks_script")" ]]
+    then
+        # validate the branch we're about to build
+        python_cmd "$(native_path "$git_hooks_script")" --all_files || \
+            fatal "coding policy check failed"
+    fi
 fi
 end_section "coding policy check"
 
@@ -353,6 +409,7 @@ do
                   begin_section "Autobuild metadata"
                   python_cmd "$helpers/codeticket.py" addoutput "Autobuild Metadata" "$build_dir/autobuild-package.xml" --mimetype text/xml \
                       || fatal "Upload of autobuild metadata failed"
+                  metadata+=("$build_dir/autobuild-package.xml")
                   if [ "$arch" != "Linux" ]
                   then
                       record_dependencies_graph "$build_dir/autobuild-package.xml" # defined in buildscripts/hg/bin/build.sh
@@ -366,8 +423,11 @@ do
               if [ -r "$build_dir/newview/viewer_version.txt" ]
               then
                   begin_section "Viewer Version"
-                  python_cmd "$helpers/codeticket.py" addoutput "Viewer Version" "$(<"$build_dir/newview/viewer_version.txt")" --mimetype inline-text \
+                  viewer_version="$(<"$build_dir/newview/viewer_version.txt")"
+                  python_cmd "$helpers/codeticket.py" addoutput "Viewer Version" "$viewer_version" --mimetype inline-text \
                       || fatal "Upload of viewer version failed"
+                  metadata+=("$build_dir/newview/viewer_version.txt")
+                  echo "viewer_version=$viewer_version" >> "$GITHUB_OUTPUT"
                   end_section "Viewer Version"
               fi
               ;;
@@ -376,12 +436,14 @@ do
               then
                   record_event "Doxygen warnings generated; see doxygen_warnings.log"
                   python_cmd "$helpers/codeticket.py" addoutput "Doxygen Log" "$build_dir/doxygen_warnings.log" --mimetype text/plain ## TBD
+                  metadata+=("$build_dir/doxygen_warnings.log")
               fi
               if [ -d "$build_dir/doxygen/html" ]
               then
                   tar -c -f "$build_dir/viewer-doxygen.tar.bz2" --strip-components 3  "$build_dir/doxygen/html"
                   python_cmd "$helpers/codeticket.py" addoutput "Doxygen Tarball" "$build_dir/viewer-doxygen.tar.bz2" \
                       || fatal "Upload of doxygen tarball failed"
+                  metadata+=("$build_dir/viewer-doxygen.tar.bz2")
               fi
               ;;
             *)
@@ -497,6 +559,7 @@ then
       retry_cmd 4 30 python_cmd "$helpers/codeticket.py" addoutput Installer "$package"  \
           || fatal "Upload of installer failed"
       wait_for_codeticket
+      installer+=("$package")
 
       # Upload additional packages.
       for package_id in $additional_packages
@@ -507,6 +570,7 @@ then
           retry_cmd 4 30 python_cmd "$helpers/codeticket.py" addoutput "Installer $package_id" "$package" \
               || fatal "Upload of installer $package_id failed"
           wait_for_codeticket
+          installer+=("$package")
         else
           record_failure "Failed to find additional package for '$package_id'."
         fi
@@ -517,32 +581,53 @@ then
           # nat 2016-12-22: without RELEASE_CRASH_REPORTING, we have no symbol file.
           if [ "${RELEASE_CRASH_REPORTING:-}" != "OFF" ]
           then
+              # BugSplat wants to see xcarchive.zip
+              # e.g. build-darwin-x86_64/newview/Release/Second Life Test.xcarchive.zip
+              symbol_file="${build_dir}/newview/${variant}/${viewer_channel}.xcarchive.zip"
+              if [[ ! -f "$symbol_file" ]]
+              then
+                  # symbol tarball we prep for (e.g.) Breakpad
+                  symbol_file="$VIEWER_SYMBOL_FILE"
+              else
+                  # SL-19243 HACK: List contents of xcarchive.zip, before running
+                  # upload-mac-symbols.sh which moves it to /tmp
+                  unzip -l "$symbol_file"
+              fi
               # Upload crash reporter file
-              retry_cmd 4 30 python_cmd "$helpers/codeticket.py" addoutput "Symbolfile" "$VIEWER_SYMBOL_FILE" \
+              retry_cmd 4 30 python_cmd "$helpers/codeticket.py" addoutput "Symbolfile" "$symbol_file" \
                   || fatal "Upload of symbolfile failed"
               wait_for_codeticket
+              symbolfile+=("$symbol_file")
           fi
 
           # Upload the llphysicsextensions_tpv package, if one was produced
           # *TODO: Make this an upload-extension
-          if [ -r "$build_dir/llphysicsextensions_package" ]
+          # Only upload this package when building the private repo so the
+          # artifact is private.
+          if [[ "$GITHUB_REPOSITORY" == "secondlife/viewer-private" && \
+                -r "$build_dir/llphysicsextensions_package" ]]
           then
               llphysicsextensions_package=$(cat $build_dir/llphysicsextensions_package)
               retry_cmd 4 30 python_cmd "$helpers/codeticket.py" addoutput "Physics Extensions Package" "$llphysicsextensions_package" --private \
                   || fatal "Upload of physics extensions package failed"
+              physicstpv+=("$llphysicsextensions_package")
           fi
       fi
 
       # Run upload extensions
       # Ex: bugsplat
-      if [ -d ${build_dir}/packages/upload-extensions ]; then
-          for extension in ${build_dir}/packages/upload-extensions/*.sh; do
-              begin_section "Upload Extension $extension"
-              . $extension
-              [ $? -eq 0 ] || fatal "Upload of extension $extension failed"
-              wait_for_codeticket
-              end_section "Upload Extension $extension"
-          done
+      ## SL-19243 HACK: testing separate GH upload jobs
+      if false
+      then
+          if [ -d ${build_dir}/packages/upload-extensions ]; then
+              for extension in ${build_dir}/packages/upload-extensions/*.sh; do
+                  begin_section "Upload Extension $extension"
+                  . $extension
+                  [ $? -eq 0 ] || fatal "Upload of extension $extension failed"
+                  wait_for_codeticket
+                  end_section "Upload Extension $extension"
+              done
+          fi
       fi
     fi
     end_section "Uploads"
diff --git a/buildscripts_support_functions b/buildscripts_support_functions
new file mode 100644
index 0000000000..557d2f80fb
--- /dev/null
+++ b/buildscripts_support_functions
@@ -0,0 +1,60 @@
+# standalone functions from sling-buildscripts
+
+set_build_number_to_revision()
+{
+    record_event "buildNumber $revision"
+}
+
+record_event()
+{
+    echo "=== $@"
+}
+
+begin_section()
+{
+    record_event "START $*"
+    sections+=("$*")
+}
+
+end_section()
+{
+    # accommodate dumb Mac bash 3, which doesn't understand array[-1]
+    local last=$(( ${#sections[@]} - 1 ))
+    record_event "END ${*:-${sections[$last]}}"
+    unset "sections[$last]"
+}
+
+record_success()
+{
+    record_event "SUCCESS $*"
+}
+
+record_failure()
+{
+    record_event "FAILURE $*" >&2
+}
+
+fatal()
+{
+    record_failure "$@"
+    finalize false
+    exit 1
+}
+
+# redefined fail for backward compatibility
+alias fail=fatal
+
+pass()
+{
+  exit 0
+}
+
+export -f set_build_number_to_revision
+export -f record_event
+export -f begin_section
+export -f end_section
+export -f record_success
+export -f record_failure
+export -f fatal
+export -f pass
+export sections
diff --git a/indra/cmake/00-Common.cmake b/indra/cmake/00-Common.cmake
index c708199309..1207979762 100644
--- a/indra/cmake/00-Common.cmake
+++ b/indra/cmake/00-Common.cmake
@@ -26,6 +26,11 @@ set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} $ENV{LL_BUILD}")
 
 # Portable compilation flags.
 add_compile_definitions( ADDRESS_SIZE=${ADDRESS_SIZE})
+# Because older versions of Boost.Bind dumped placeholders _1, _2 et al. into
+# the global namespace, Boost now requires either BOOST_BIND_NO_PLACEHOLDERS
+# to avoid that or BOOST_BIND_GLOBAL_PLACEHOLDERS to state that we require it
+# -- which we do. Without one or the other, we get a ton of Boost warnings.
+add_compile_definitions(BOOST_BIND_GLOBAL_PLACEHOLDERS)
 
 # Configure crash reporting
 set(RELEASE_CRASH_REPORTING OFF CACHE BOOL "Enable use of crash reporting in release builds")
@@ -55,15 +60,6 @@ if (WINDOWS)
   # http://www.cmake.org/pipermail/cmake/2009-September/032143.html
   string(REPLACE "/Zm1000" " " CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
 
-  # Without PreferredToolArchitecture=x64, as of 2020-06-26 the 32-bit
-  # compiler on our TeamCity build hosts has started running out of virtual
-  # memory for the precompiled header file.
-  # CP changed to only append the flag for 32bit builds - on 64bit builds,
-  # locally at least, the build output is spammed with 1000s of 'D9002'
-  # warnings about this switch being ignored.
-  if(ADDRESS_SIZE EQUAL 32 AND DEFINED ENV{"TEAMCITY_PROJECT_NAME"})
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /p:PreferredToolArchitecture=x64")  
-  endif()
   # zlib has assembly-language object files incompatible with SAFESEH
   add_link_options(/LARGEADDRESSAWARE
           /SAFESEH:NO
diff --git a/indra/cmake/APR.cmake b/indra/cmake/APR.cmake
index 8a0939c92c..21139319c3 100644
--- a/indra/cmake/APR.cmake
+++ b/indra/cmake/APR.cmake
@@ -16,7 +16,6 @@ if (WINDOWS)
   endif (LLCOMMON_LINK_SHARED)
   target_link_libraries( ll::apr INTERFACE
           ${ARCH_PREBUILT_DIRS_RELEASE}/${APR_selector}apr-1.lib
-          ${ARCH_PREBUILT_DIRS_RELEASE}/${APR_selector}apriconv-1.lib
           ${ARCH_PREBUILT_DIRS_RELEASE}/${APR_selector}aprutil-1.lib
           )
 elseif (DARWIN)
@@ -37,7 +36,6 @@ else (WINDOWS)
   target_link_libraries( ll::apr INTERFACE
           apr-1
           aprutil-1
-          iconv
           uuid
           rt
           )
diff --git a/indra/cmake/Copy3rdPartyLibs.cmake b/indra/cmake/Copy3rdPartyLibs.cmake
index d43cc30706..a3db02372d 100644
--- a/indra/cmake/Copy3rdPartyLibs.cmake
+++ b/indra/cmake/Copy3rdPartyLibs.cmake
@@ -57,7 +57,6 @@ if(WINDOWS)
         openjp2.dll
         libapr-1.dll
         libaprutil-1.dll
-        libapriconv-1.dll
         nghttp2.dll
         libhunspell.dll
         uriparser.dll
@@ -172,7 +171,6 @@ elseif(DARWIN)
         libndofdev.dylib
         libnghttp2.dylib
         libnghttp2.14.dylib
-        libnghttp2.14.19.0.dylib
         liburiparser.dylib
         liburiparser.1.dylib
         liburiparser.1.0.27.dylib
diff --git a/indra/cmake/Linking.cmake b/indra/cmake/Linking.cmake
index 4a501f420b..1ce21c11f9 100644
--- a/indra/cmake/Linking.cmake
+++ b/indra/cmake/Linking.cmake
@@ -62,6 +62,7 @@ elseif (WINDOWS)
           user32
           ole32
           dbghelp
+          rpcrt4.lib
           legacy_stdio_definitions
           )
 else()
diff --git a/indra/cmake/Variables.cmake b/indra/cmake/Variables.cmake
index e6285ab48b..778384f87c 100644
--- a/indra/cmake/Variables.cmake
+++ b/indra/cmake/Variables.cmake
@@ -173,13 +173,17 @@ if (${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
   set(CMAKE_XCODE_ATTRIBUTE_GCC_OPTIMIZATION_LEVEL "${CMAKE_MATCH_1}")
   message(STATUS "CMAKE_XCODE_ATTRIBUTE_GCC_OPTIMIZATION_LEVEL = '${CMAKE_XCODE_ATTRIBUTE_GCC_OPTIMIZATION_LEVEL}'")
 
-  string(REGEX MATCHALL "[^ ]+" LL_BUILD_LIST "$ENV{LL_BUILD}")
-  list(FIND LL_BUILD_LIST "-iwithsysroot" sysroot_idx)
-  if ("${sysroot_idx}" LESS 0)
-    message(FATAL_ERROR "Environment variable LL_BUILD must contain '-iwithsysroot'")
-  endif ()
-  math(EXPR sysroot_idx "${sysroot_idx} + 1")
-  list(GET LL_BUILD_LIST "${sysroot_idx}" CMAKE_OSX_SYSROOT)
+  # allow disabling this check by setting LL_SKIP_REQUIRE_SYSROOT either ON as cmake cache var or non-empty as environment var
+  set(LL_SKIP_REQUIRE_SYSROOT OFF CACHE BOOL "Skip requirement to set toolchain sysroot ahead of time. Not skipped by default for consistency, but skipping can be useful for selecting alternative xcode versions side by side")
+  if("$ENV{LL_SKIP_REQUIRE_SYSROOT}" STREQUAL "" AND NOT ${LL_SKIP_REQUIRE_SYSROOT})
+    string(REGEX MATCHALL "[^ ]+" LL_BUILD_LIST "$ENV{LL_BUILD}")
+    list(FIND LL_BUILD_LIST "-iwithsysroot" sysroot_idx)
+    if ("${sysroot_idx}" LESS 0)
+      message(FATAL_ERROR "Environment variable LL_BUILD must contain '-iwithsysroot'")
+    endif ()
+    math(EXPR sysroot_idx "${sysroot_idx} + 1")
+    list(GET LL_BUILD_LIST "${sysroot_idx}" CMAKE_OSX_SYSROOT)
+  endif()
   message(STATUS "CMAKE_OSX_SYSROOT = '${CMAKE_OSX_SYSROOT}'")
 
   set(CMAKE_XCODE_ATTRIBUTE_GCC_VERSION "com.apple.compilers.llvm.clang.1_0")
diff --git a/indra/llaudio/llaudioengine.h b/indra/llaudio/llaudioengine.h
index a133898969..c045d18c42 100755
--- a/indra/llaudio/llaudioengine.h
+++ b/indra/llaudio/llaudioengine.h
@@ -30,6 +30,7 @@
 
 #include <list>
 #include <map>
+#include <array>
 
 #include "v3math.h"
 #include "v3dmath.h"
diff --git a/indra/llcommon/llcoros.cpp b/indra/llcommon/llcoros.cpp
index 70d8dfc8b9..cfaf3415e7 100644
--- a/indra/llcommon/llcoros.cpp
+++ b/indra/llcommon/llcoros.cpp
@@ -123,11 +123,7 @@ LLCoros::LLCoros():
     // Previously we used
     // boost::context::guarded_stack_allocator::default_stacksize();
     // empirically this is insufficient.
-#if ADDRESS_SIZE == 64
-    mStackSize(512*1024),
-#else
-    mStackSize(256*1024),
-#endif
+    mStackSize(768*1024),
     // mCurrent does NOT own the current CoroData instance -- it simply
     // points to it. So initialize it with a no-op deleter.
     mCurrent{ [](CoroData*){} }
diff --git a/indra/llcommon/llleap.cpp b/indra/llcommon/llleap.cpp
index 259f5bc505..5b5bf97cef 100644
--- a/indra/llcommon/llleap.cpp
+++ b/indra/llcommon/llleap.cpp
@@ -389,6 +389,17 @@ public:
             // Read all remaining bytes and log.
             LL_INFOS("LLLeap") << mDesc << ": " << rest << LL_ENDL;
         }
+        /*--------------------------- diagnostic ---------------------------*/
+        else if (data["eof"].asBoolean())
+        {
+            LL_DEBUGS("LLLeap") << mDesc << " ended, no partial line" << LL_ENDL;
+        }
+        else
+        {
+            LL_DEBUGS("LLLeap") << mDesc << " (still running, " << childerr.size()
+                                << " bytes pending)" << LL_ENDL;
+        }
+        /*------------------------- end diagnostic -------------------------*/
         return false;
     }
 
diff --git a/indra/llcommon/llprocessor.cpp b/indra/llcommon/llprocessor.cpp
index 4a1a81f083..28f8bc2b93 100644
--- a/indra/llcommon/llprocessor.cpp
+++ b/indra/llcommon/llprocessor.cpp
@@ -746,7 +746,7 @@ private:
 		__cpuid(0x1, eax, ebx, ecx, edx);
 		if(feature_infos[0] != (S32)edx)
 		{
-			LL_ERRS() << "machdep.cpu.feature_bits doesn't match expected cpuid result!" << LL_ENDL;
+			LL_WARNS() << "machdep.cpu.feature_bits doesn't match expected cpuid result!" << LL_ENDL;
 		} 
 #endif // LL_RELEASE_FOR_DOWNLOAD 	
 
diff --git a/indra/llcommon/llrand.cpp b/indra/llcommon/llrand.cpp
index cb28a8f5c3..33afc50cf7 100644
--- a/indra/llcommon/llrand.cpp
+++ b/indra/llcommon/llrand.cpp
@@ -58,46 +58,14 @@
  * to restore uniform distribution.
  */
 
-// *NOTE: The system rand implementation is probably not correct.
-#define LL_USE_SYSTEM_RAND 0
+static LLRandLagFib2281 gRandomGenerator(LLUUID::getRandomSeed());
 
-#if LL_USE_SYSTEM_RAND
-#include <cstdlib>
-#endif
+// no default implementation, only specific F64 and F32 specializations
+template <typename REAL>
+inline REAL ll_internal_random();
 
-#if LL_USE_SYSTEM_RAND
-class LLSeedRand
-{
-public:
-	LLSeedRand()
-	{
-#if LL_WINDOWS
-		srand(LLUUID::getRandomSeed());
-#else
-		srand48(LLUUID::getRandomSeed());
-#endif
-	}
-};
-static LLSeedRand sRandomSeeder;
-inline F64 ll_internal_random_double()
-{
-#if LL_WINDOWS
-	return (F64)rand() / (F64)RAND_MAX; 
-#else
-	return drand48();
-#endif
-}
-inline F32 ll_internal_random_float()
-{
-#if LL_WINDOWS
-	return (F32)rand() / (F32)RAND_MAX; 
-#else
-	return (F32)drand48();
-#endif
-}
-#else
-static LLRandLagFib2281 gRandomGenerator(LLUUID::getRandomSeed());
-inline F64 ll_internal_random_double()
+template <>
+inline F64 ll_internal_random<F64>()
 {
 	// *HACK: Through experimentation, we have found that dual core
 	// CPUs (or at least multi-threaded processes) seem to
@@ -108,15 +76,35 @@ inline F64 ll_internal_random_double()
 	return rv;
 }
 
+template <>
+inline F32 ll_internal_random<F32>()
+{
+    return F32(ll_internal_random<F64>());
+}
+
+/*------------------------------ F64 aliases -------------------------------*/
+inline F64 ll_internal_random_double()
+{
+    return ll_internal_random<F64>();
+}
+
+F64 ll_drand()
+{
+	return ll_internal_random_double();
+}
+
+/*------------------------------ F32 aliases -------------------------------*/
 inline F32 ll_internal_random_float()
 {
-	// The clamping rules are described above.
-	F32 rv = (F32)gRandomGenerator();
-	if(!((rv >= 0.0f) && (rv < 1.0f))) return fmod(rv, 1.f);
-	return rv;
+    return ll_internal_random<F32>();
+}
+
+F32 ll_frand()
+{
+	return ll_internal_random_float();
 }
-#endif
 
+/*-------------------------- clamped random range --------------------------*/
 S32 ll_rand()
 {
 	return ll_rand(RAND_MAX);
@@ -130,42 +118,28 @@ S32 ll_rand(S32 val)
 	return rv;
 }
 
-F32 ll_frand()
-{
-	return ll_internal_random_float();
-}
-
-F32 ll_frand(F32 val)
+template <typename REAL>
+REAL ll_grand(REAL val)
 {
 	// The clamping rules are described above.
-	F32 rv = ll_internal_random_float() * val;
+	REAL rv = ll_internal_random<REAL>() * val;
 	if(val > 0)
 	{
-		if(rv >= val) return 0.0f;
+		if(rv >= val) return REAL();
 	}
 	else
 	{
-		if(rv <= val) return 0.0f;
+		if(rv <= val) return REAL();
 	}
 	return rv;
 }
 
-F64 ll_drand()
+F32 ll_frand(F32 val)
 {
-	return ll_internal_random_double();
+    return ll_grand<F32>(val);
 }
 
 F64 ll_drand(F64 val)
 {
-	// The clamping rules are described above.
-	F64 rv = ll_internal_random_double() * val;
-	if(val > 0)
-	{
-		if(rv >= val) return 0.0;
-	}
-	else
-	{
-		if(rv <= val) return 0.0;
-	}
-	return rv;
+    return ll_grand<F64>(val);
 }
diff --git a/indra/llcommon/tests/llleap_test.cpp b/indra/llcommon/tests/llleap_test.cpp
index 3ae48a2532..7197dedfbf 100644
--- a/indra/llcommon/tests/llleap_test.cpp
+++ b/indra/llcommon/tests/llleap_test.cpp
@@ -17,8 +17,6 @@
 // std headers
 #include <functional>
 // external library headers
-#include <boost/assign/list_of.hpp>
-#include <boost/phoenix/core/argument.hpp>
 // other Linden headers
 #include "../test/lltut.h"
 #include "../test/namedtempfile.h"
@@ -30,10 +28,6 @@
 #include "stringize.h"
 #include "StringVec.h"
 
-using boost::assign::list_of;
-
-StringVec sv(const StringVec& listof) { return listof; }
-
 #if defined(LL_WINDOWS)
 #define sleep(secs) _sleep((secs) * 1000)
 
@@ -104,17 +98,12 @@ namespace tut
         llleap_data():
             reader(".py",
                    // This logic is adapted from vita.viewerclient.receiveEvent()
-                   boost::phoenix::placeholders::arg1 <<
+                   [](std::ostream& out){ out <<
                    "import re\n"
                    "import os\n"
                    "import sys\n"
                    "\n"
-                   "try:\n"
-                   // new freestanding llsd package
-                   "    import llsd\n"
-                   "except ImportError:\n"
-                   // older llbase.llsd module
-                   "    from llbase import llsd\n"
+                   "import llsd\n"
                    "\n"
                    "class ProtocolError(Exception):\n"
                    "    def __init__(self, msg, data):\n"
@@ -193,7 +182,7 @@ namespace tut
                    "def request(pump, data):\n"
                    "    # we expect 'data' is a dict\n"
                    "    data['reply'] = _reply\n"
-                   "    send(pump, data)\n"),
+                   "    send(pump, data)\n";}),
             // Get the actual pathname of the NamedExtTempFile and trim off
             // the ".py" extension. (We could cache reader.getName() in a
             // separate member variable, but I happen to know getName() just
@@ -218,14 +207,14 @@ namespace tut
     void object::test<1>()
     {
         set_test_name("multiple LLLeap instances");
-        NamedTempFile script("py",
-                             "import time\n"
-                             "time.sleep(1)\n");
+        NamedExtTempFile script("py",
+                                "import time\n"
+                                "time.sleep(1)\n");
         LLLeapVector instances;
         instances.push_back(LLLeap::create(get_test_name(),
-                                           sv(list_of(PYTHON)(script.getName())))->getWeak());
+                                           StringVec{PYTHON, script.getName()})->getWeak());
         instances.push_back(LLLeap::create(get_test_name(),
-                                           sv(list_of(PYTHON)(script.getName())))->getWeak());
+                                           StringVec{PYTHON, script.getName()})->getWeak());
         // In this case we're simply establishing that two LLLeap instances
         // can coexist without throwing exceptions or bombing in any other
         // way. Wait for them to terminate.
@@ -236,10 +225,10 @@ namespace tut
     void object::test<2>()
     {
         set_test_name("stderr to log");
-        NamedTempFile script("py",
-                             "import sys\n"
-                             "sys.stderr.write('''Hello from Python!\n"
-                             "note partial line''')\n");
+        NamedExtTempFile script("py",
+                                "import sys\n"
+                                "sys.stderr.write('''Hello from Python!\n"
+                                "note partial line''')\n");
         StringVec vcommand{ PYTHON, script.getName() };
         CaptureLog log(LLError::LEVEL_INFO);
         waitfor(LLLeap::create(get_test_name(), vcommand));
@@ -251,11 +240,11 @@ namespace tut
     void object::test<3>()
     {
         set_test_name("bad stdout protocol");
-        NamedTempFile script("py",
-                             "print('Hello from Python!')\n");
+        NamedExtTempFile script("py",
+                                "print('Hello from Python!')\n");
         CaptureLog log(LLError::LEVEL_WARN);
         waitfor(LLLeap::create(get_test_name(),
-                               sv(list_of(PYTHON)(script.getName()))));
+                               StringVec{PYTHON, script.getName()}));
         ensure_contains("error log line",
                         log.messageWith("invalid protocol"), "Hello from Python!");
     }
@@ -264,13 +253,13 @@ namespace tut
     void object::test<4>()
     {
         set_test_name("leftover stdout");
-        NamedTempFile script("py",
-                             "import sys\n"
-                             // note lack of newline
-                             "sys.stdout.write('Hello from Python!')\n");
+        NamedExtTempFile script("py",
+                                "import sys\n"
+                                // note lack of newline
+                                "sys.stdout.write('Hello from Python!')\n");
         CaptureLog log(LLError::LEVEL_WARN);
         waitfor(LLLeap::create(get_test_name(),
-                               sv(list_of(PYTHON)(script.getName()))));
+                               StringVec{PYTHON, script.getName()}));
         ensure_contains("error log line",
                         log.messageWith("Discarding"), "Hello from Python!");
     }
@@ -279,12 +268,12 @@ namespace tut
     void object::test<5>()
     {
         set_test_name("bad stdout len prefix");
-        NamedTempFile script("py",
-                             "import sys\n"
-                             "sys.stdout.write('5a2:something')\n");
+        NamedExtTempFile script("py",
+                                "import sys\n"
+                                "sys.stdout.write('5a2:something')\n");
         CaptureLog log(LLError::LEVEL_WARN);
         waitfor(LLLeap::create(get_test_name(),
-                               sv(list_of(PYTHON)(script.getName()))));
+                               StringVec{PYTHON, script.getName()}));
         ensure_contains("error log line",
                         log.messageWith("invalid protocol"), "5a2:");
     }
@@ -386,17 +375,18 @@ namespace tut
         set_test_name("round trip");
         AckAPI api;
         Result result;
-        NamedTempFile script("py",
-                             boost::phoenix::placeholders::arg1 <<
-                             "from " << reader_module << " import *\n"
-                             // make a request on our little API
-                             "request(pump='" << api.getName() << "', data={})\n"
-                             // wait for its response
-                             "resp = get()\n"
-                             "result = '' if resp == dict(pump=replypump(), data='ack')\\\n"
-                             "            else 'bad: ' + str(resp)\n"
-                             "send(pump='" << result.getName() << "', data=result)\n");
-        waitfor(LLLeap::create(get_test_name(), sv(list_of(PYTHON)(script.getName()))));
+        NamedExtTempFile script("py",
+                                [&](std::ostream& out){ out <<
+                                "from " << reader_module << " import *\n"
+                                // make a request on our little API
+                                "request(pump='" << api.getName() << "', data={})\n"
+                                // wait for its response
+                                "resp = get()\n"
+                                "result = '' if resp == dict(pump=replypump(), data='ack')\\\n"
+                                "            else 'bad: ' + str(resp)\n"
+                                "send(pump='" << result.getName() << "', data=result)\n";});
+        waitfor(LLLeap::create(get_test_name(),
+                               StringVec{PYTHON, script.getName()}));
         result.ensure();
     }
 
@@ -424,38 +414,38 @@ namespace tut
         // iterations etc. in OS pipes and the LLLeap/LLProcess implementation.
         ReqIDAPI api;
         Result result;
-        NamedTempFile script("py",
-                             boost::phoenix::placeholders::arg1 <<
-                             "import sys\n"
-                             "from " << reader_module << " import *\n"
-                             // Note that since reader imports llsd, this
-                             // 'import *' gets us llsd too.
-                             "sample = llsd.format_notation(dict(pump='" <<
-                             api.getName() << "', data=dict(reqid=999999, reply=replypump())))\n"
-                             // The whole packet has length prefix too: "len:data"
-                             "samplen = len(str(len(sample))) + 1 + len(sample)\n"
-                             // guess how many messages it will take to
-                             // accumulate BUFFERED_LENGTH
-                             "count = int(" << BUFFERED_LENGTH << "/samplen)\n"
-                             "print('Sending %s requests' % count, file=sys.stderr)\n"
-                             "for i in range(count):\n"
-                             "    request('" << api.getName() << "', dict(reqid=i))\n"
-                             // The assumption in this specific test that
-                             // replies will arrive in the same order as
-                             // requests is ONLY valid because the API we're
-                             // invoking sends replies instantly. If the API
-                             // had to wait for some external event before
-                             // sending its reply, replies could arrive in
-                             // arbitrary order, and we'd have to tick them
-                             // off from a set.
-                             "result = ''\n"
-                             "for i in range(count):\n"
-                             "    resp = get()\n"
-                             "    if resp['data']['reqid'] != i:\n"
-                             "        result = 'expected reqid=%s in %s' % (i, resp)\n"
-                             "        break\n"
-                             "send(pump='" << result.getName() << "', data=result)\n");
-        waitfor(LLLeap::create(get_test_name(), sv(list_of(PYTHON)(script.getName()))),
+        NamedExtTempFile script("py",
+                                [&](std::ostream& out){ out <<
+                                "import sys\n"
+                                "from " << reader_module << " import *\n"
+                                // Note that since reader imports llsd, this
+                                // 'import *' gets us llsd too.
+                                "sample = llsd.format_notation(dict(pump='" <<
+                                api.getName() << "', data=dict(reqid=999999, reply=replypump())))\n"
+                                // The whole packet has length prefix too: "len:data"
+                                "samplen = len(str(len(sample))) + 1 + len(sample)\n"
+                                // guess how many messages it will take to
+                                // accumulate BUFFERED_LENGTH
+                                "count = int(" << BUFFERED_LENGTH << "/samplen)\n"
+                                "print('Sending %s requests' % count, file=sys.stderr)\n"
+                                "for i in range(count):\n"
+                                "    request('" << api.getName() << "', dict(reqid=i))\n"
+                                // The assumption in this specific test that
+                                // replies will arrive in the same order as
+                                // requests is ONLY valid because the API we're
+                                // invoking sends replies instantly. If the API
+                                // had to wait for some external event before
+                                // sending its reply, replies could arrive in
+                                // arbitrary order, and we'd have to tick them
+                                // off from a set.
+                                "result = ''\n"
+                                "for i in range(count):\n"
+                                "    resp = get()\n"
+                                "    if resp['data']['reqid'] != i:\n"
+                                "        result = 'expected reqid=%s in %s' % (i, resp)\n"
+                                "        break\n"
+                                "send(pump='" << result.getName() << "', data=result)\n";});
+        waitfor(LLLeap::create(get_test_name(), StringVec{PYTHON, script.getName()}),
                 300);               // needs more realtime than most tests
         result.ensure();
     }
@@ -467,65 +457,62 @@ namespace tut
     {
         ReqIDAPI api;
         Result result;
-        NamedTempFile script("py",
-                             boost::phoenix::placeholders::arg1 <<
-                             "import sys\n"
-                             "from " << reader_module << " import *\n"
-                             // Generate a very large string value.
-                             "desired = int(sys.argv[1])\n"
-                             // 7 chars per item: 6 digits, 1 comma
-                             "count = int((desired - 50)/7)\n"
-                             "large = ''.join('%06d,' % i for i in range(count))\n"
-                             // Pass 'large' as reqid because we know the API
-                             // will echo reqid, and we want to receive it back.
-                             "request('" << api.getName() << "', dict(reqid=large))\n"
-                             "try:\n"
-                             "    resp = get()\n"
-                             "except ParseError as e:\n"
-                             "    # try to find where e.data diverges from expectation\n"
-                             // Normally we'd expect a 'pump' key in there,
-                             // too, with value replypump(). But Python
-                             // serializes keys in a different order than C++,
-                             // so incoming data start with 'data'.
-                             // Truthfully, though, if we get as far as 'pump'
-                             // before we find a difference, something's very
-                             // strange.
-                             "    expect = llsd.format_notation(dict(data=dict(reqid=large)))\n"
-                             "    chunk = 40\n"
-                             "    for offset in range(0, max(len(e.data), len(expect)), chunk):\n"
-                             "        if e.data[offset:offset+chunk] != \\\n"
-                             "           expect[offset:offset+chunk]:\n"
-                             "            print('Offset %06d: expect %r,\\n'\\\n"
-                             "                                '                  get %r' %\\\n"
-                             "                                (offset,\n"
-                             "                                 expect[offset:offset+chunk],\n"
-                             "                                 e.data[offset:offset+chunk]),\n"
-                             "                                 file=sys.stderr)\n"
-                             "            break\n"
-                             "    else:\n"
-                             "        print('incoming data matches expect?!', file=sys.stderr)\n"
-                             "    send('" << result.getName() << "', '%s: %s' % (e.__class__.__name__, e))\n"
-                             "    sys.exit(1)\n"
-                             "\n"
-                             "echoed = resp['data']['reqid']\n"
-                             "if echoed == large:\n"
-                             "    send('" << result.getName() << "', '')\n"
-                             "    sys.exit(0)\n"
-                             // Here we know echoed did NOT match; try to find where
-                             "for i in range(count):\n"
-                             "    start = 7*i\n"
-                             "    end   = 7*(i+1)\n"
-                             "    if end > len(echoed)\\\n"
-                             "    or echoed[start:end] != large[start:end]:\n"
-                             "        send('" << result.getName() << "',\n"
-                             "             'at offset %s, expected %r but got %r' %\n"
-                             "             (start, large[start:end], echoed[start:end]))\n"
-                             "sys.exit(1)\n");
+        NamedExtTempFile script("py",
+                                [&](std::ostream& out){ out <<
+                                "import sys\n"
+                                "from " << reader_module << " import *\n"
+                                // Generate a very large string value.
+                                "desired = int(sys.argv[1])\n"
+                                // 7 chars per item: 6 digits, 1 comma
+                                "count = int((desired - 50)/7)\n"
+                                "large = ''.join('%06d,' % i for i in range(count))\n"
+                                // Pass 'large' as reqid because we know the API
+                                // will echo reqid, and we want to receive it back.
+                                "request('" << api.getName() << "', dict(reqid=large))\n"
+                                "try:\n"
+                                "    resp = get()\n"
+                                "except ParseError as e:\n"
+                                "    # try to find where e.data diverges from expectation\n"
+                                // Normally we'd expect a 'pump' key in there,
+                                // too, with value replypump(). But Python
+                                // serializes keys in a different order than C++,
+                                // so incoming data start with 'data'.
+                                // Truthfully, though, if we get as far as 'pump'
+                                // before we find a difference, something's very
+                                // strange.
+                                "    expect = llsd.format_notation(dict(data=dict(reqid=large)))\n"
+                                "    chunk = 40\n"
+                                "    for offset in range(0, max(len(e.data), len(expect)), chunk):\n"
+                                "        if e.data[offset:offset+chunk] != \\\n"
+                                "           expect[offset:offset+chunk]:\n"
+                                "            print('Offset %06d: expect %r,\\n'\\\n"
+                                "                                '                  get %r' %\\\n"
+                                "                                (offset,\n"
+                                "                                 expect[offset:offset+chunk],\n"
+                                "                                 e.data[offset:offset+chunk]),\n"
+                                "                                 file=sys.stderr)\n"
+                                "            break\n"
+                                "    else:\n"
+                                "        print('incoming data matches expect?!', file=sys.stderr)\n"
+                                "    send('" << result.getName() << "', '%s: %s' % (e.__class__.__name__, e))\n"
+                                "    sys.exit(1)\n"
+                                "\n"
+                                "echoed = resp['data']['reqid']\n"
+                                "if echoed == large:\n"
+                                "    send('" << result.getName() << "', '')\n"
+                                "    sys.exit(0)\n"
+                                // Here we know echoed did NOT match; try to find where
+                                "for i in range(count):\n"
+                                "    start = 7*i\n"
+                                "    end   = 7*(i+1)\n"
+                                "    if end > len(echoed)\\\n"
+                                "    or echoed[start:end] != large[start:end]:\n"
+                                "        send('" << result.getName() << "',\n"
+                                "             'at offset %s, expected %r but got %r' %\n"
+                                "             (start, large[start:end], echoed[start:end]))\n"
+                                "sys.exit(1)\n";});
         waitfor(LLLeap::create(test_name,
-                               sv(list_of
-                                  (PYTHON)
-                                  (script.getName())
-                                  (stringize(size)))),
+                               StringVec{PYTHON, script.getName(), stringize(size)}),
                 180);               // try a longer timeout
         result.ensure();
     }
diff --git a/indra/llcommon/tests/llprocess_test.cpp b/indra/llcommon/tests/llprocess_test.cpp
index 81449b4a42..b6b297b8d7 100644
--- a/indra/llcommon/tests/llprocess_test.cpp
+++ b/indra/llcommon/tests/llprocess_test.cpp
@@ -151,8 +151,38 @@ struct PythonProcessLauncher
     /// Launch Python script; verify that it launched
     void launch()
     {
-        mPy = LLProcess::create(mParams);
-        tut::ensure(STRINGIZE("Couldn't launch " << mDesc << " script"), bool(mPy));
+        try
+        {
+            mPy = LLProcess::create(mParams);
+            tut::ensure(STRINGIZE("Couldn't launch " << mDesc << " script"), bool(mPy));
+        }
+        catch (const tut::failure&)
+        {
+            // On Windows, if APR_LOG is set, our version of APR's
+            // apr_create_proc() logs to the specified file. If this test
+            // failed, try to report that log.
+            const char* APR_LOG = getenv("APR_LOG");
+            if (APR_LOG && *APR_LOG)
+            {
+                std::ifstream inf(APR_LOG);
+                if (! inf.is_open())
+                {
+                    LL_WARNS() << "Couldn't open '" << APR_LOG << "'" << LL_ENDL;
+                }
+                else
+                {
+                    LL_WARNS() << "==============================" << LL_ENDL;
+                    LL_WARNS() << "From '" << APR_LOG << "':" << LL_ENDL;
+                    std::string line;
+                    while (std::getline(inf, line))
+                    {
+                        LL_WARNS() << line << LL_ENDL;
+                    }
+                    LL_WARNS() << "==============================" << LL_ENDL;
+                }
+            }
+            throw;
+        }
     }
 
     /// Run Python script and wait for it to complete.
@@ -191,7 +221,7 @@ struct PythonProcessLauncher
     LLProcess::Params mParams;
     LLProcessPtr mPy;
     std::string mDesc;
-    NamedTempFile mScript;
+    NamedExtTempFile mScript;
 };
 
 /// convenience function for PythonProcessLauncher::run()
@@ -214,30 +244,26 @@ static std::string python_out(const std::string& desc, const CONTENT& script)
 class NamedTempDir: public boost::noncopyable
 {
 public:
-    // Use python() function to create a temp directory: I've found
-    // nothing in either Boost.Filesystem or APR quite like Python's
-    // tempfile.mkdtemp().
-    // Special extra bonus: on Mac, mkdtemp() reports a pathname
-    // starting with /var/folders/something, whereas that's really a
-    // symlink to /private/var/folders/something. Have to use
-    // realpath() to compare properly.
     NamedTempDir():
-        mPath(python_out("mkdtemp()",
-                         "from __future__ import with_statement\n"
-                         "import os.path, sys, tempfile\n"
-                         "with open(sys.argv[1], 'w') as f:\n"
-                         "    f.write(os.path.normcase(os.path.normpath(os.path.realpath(tempfile.mkdtemp()))))\n"))
-    {}
+        mPath(NamedTempFile::temp_path()),
+        mCreated(boost::filesystem::create_directories(mPath))
+    {
+        mPath = boost::filesystem::canonical(mPath);
+    }
 
     ~NamedTempDir()
     {
-        aprchk(apr_dir_remove(mPath.c_str(), gAPRPoolp));
+        if (mCreated)
+        {
+            boost::filesystem::remove_all(mPath);
+        }
     }
 
-    std::string getName() const { return mPath; }
+    std::string getName() const { return mPath.string(); }
 
 private:
-    std::string mPath;
+    boost::filesystem::path mPath;
+    bool mCreated;
 };
 
 /*****************************************************************************
@@ -355,7 +381,7 @@ namespace tut
         set_test_name("raw APR nonblocking I/O");
 
         // Create a script file in a temporary place.
-        NamedTempFile script("py",
+        NamedExtTempFile script("py",
             "from __future__ import print_function" EOL
             "import sys" EOL
             "import time" EOL
@@ -565,7 +591,13 @@ namespace tut
                                  "    f.write(os.path.normcase(os.path.normpath(os.getcwd())))\n");
         // Before running, call setWorkingDirectory()
         py.mParams.cwd = tempdir.getName();
-        ensure_equals("os.getcwd()", py.run_read(), tempdir.getName());
+        std::string expected{ tempdir.getName() };
+#if LL_WINDOWS
+        // SIGH, don't get tripped up by "C:" != "c:" --
+        // but on the Mac, using tolower() fails because "/users" != "/Users"!
+        expected = utf8str_tolower(expected);
+#endif
+        ensure_equals("os.getcwd()", py.run_read(), expected);
     }
 
     template<> template<>
diff --git a/indra/llcommon/tests/llsdserialize_test.cpp b/indra/llcommon/tests/llsdserialize_test.cpp
index acb2953b5b..2de7df6f36 100644
--- a/indra/llcommon/tests/llsdserialize_test.cpp
+++ b/indra/llcommon/tests/llsdserialize_test.cpp
@@ -45,11 +45,6 @@ typedef U32 uint32_t;
 #endif
 
 #include "boost/range.hpp"
-#include "boost/foreach.hpp"
-#include "boost/bind.hpp"
-#include "boost/phoenix/bind/bind_function.hpp"
-#include "boost/phoenix/core/argument.hpp"
-using namespace boost::phoenix;
 
 #include "llsd.h"
 #include "llsdserialize.h"
@@ -1899,7 +1894,7 @@ namespace tut
     static void writeLLSDArray(const FormatterFunction& serialize,
                                std::ostream& out, const LLSD& array)
     {
-        for (const LLSD& item : llsd::inArray(array))
+        for (const LLSD& item: llsd::inArray(array))
         {
             // It's important to delimit the entries in this file somehow
             // because, although Python's llsd.parse() can accept a file
@@ -1946,7 +1941,7 @@ namespace tut
         // Create an llsdXXXXXX file containing 'data' serialized to
         // notation.
         NamedTempFile file("llsd",
-                           // NamedTempFile's boost::function constructor
+                           // NamedTempFile's function constructor
                            // takes a callable. To this callable it passes the
                            // std::ostream with which it's writing the
                            // NamedTempFile.
@@ -1955,7 +1950,7 @@ namespace tut
                            { writeLLSDArray(serialize, out, cdata); });
 
         python("read C++ " + desc,
-               placeholders::arg1 <<
+               [&](std::ostream& out){ out <<
                import_llsd <<
                "from functools import partial\n"
                "import io\n"
@@ -1981,7 +1976,7 @@ namespace tut
                "        yield frombytes\n"
                << pydata <<
                // Don't forget raw-string syntax for Windows pathnames.
-               "verify(parse_each(open(r'" << file.getName() << "', 'rb')))\n");
+               "verify(parse_each(open(r'" << file.getName() << "', 'rb')))\n";});
     }
 
     template<> template<>
@@ -2068,7 +2063,7 @@ namespace tut
         NamedTempFile file("llsd", "");
 
         python("Python " + pyformatter,
-               placeholders::arg1 <<
+               [&](std::ostream& out){ out <<
                import_llsd <<
                "import struct\n"
                "lenformat = struct.Struct('i')\n"
diff --git a/indra/llcommon/tests/workqueue_test.cpp b/indra/llcommon/tests/workqueue_test.cpp
index 1d73f7aa0d..7655a7aa1f 100644
--- a/indra/llcommon/tests/workqueue_test.cpp
+++ b/indra/llcommon/tests/workqueue_test.cpp
@@ -83,7 +83,11 @@ namespace tut
         // signal the work item that it can quit; consider LLOneShotCond.
         LLCond<Shared> data;
         auto start = WorkQueue::TimePoint::clock::now();
-        auto interval = 100ms;
+        // 2s seems like a long time to wait, since it directly impacts the
+        // duration of this test program. Unfortunately GitHub's Mac runners
+        // are pretty wimpy, and we're getting spurious "too late" errors just
+        // because the thread doesn't wake up as soon as we want.
+        auto interval = 2s;
         queue.postEvery(
             interval,
             [&data, count = 0]
diff --git a/indra/llinventory/llsettingsbase.cpp b/indra/llinventory/llsettingsbase.cpp
index 936b166409..6ea93e045d 100644
--- a/indra/llinventory/llsettingsbase.cpp
+++ b/indra/llinventory/llsettingsbase.cpp
@@ -31,6 +31,7 @@
 #include <algorithm>
 
 #include "llsdserialize.h"
+#include <boost/bind.hpp>
 
 //=========================================================================
 namespace
diff --git a/indra/llinventory/llsettingssky.cpp b/indra/llinventory/llsettingssky.cpp
index a129f0a6f0..51fca76518 100644
--- a/indra/llinventory/llsettingssky.cpp
+++ b/indra/llinventory/llsettingssky.cpp
@@ -31,6 +31,7 @@
 #include "lltrace.h"
 #include "llfasttimer.h"
 #include "v3colorutil.h"
+#include <boost/bind.hpp>
 
 //=========================================================================
 namespace
diff --git a/indra/llinventory/llsettingswater.cpp b/indra/llinventory/llsettingswater.cpp
index d732032a6c..89156000b0 100644
--- a/indra/llinventory/llsettingswater.cpp
+++ b/indra/llinventory/llsettingswater.cpp
@@ -32,6 +32,7 @@
 #include "llfasttimer.h"
 #include "v3colorutil.h"
 #include "indra_constants.h"
+#include <boost/bind.hpp>
 
 const std::string LLSettingsWater::SETTING_BLUR_MULTIPLIER("blur_multiplier");
 const std::string LLSettingsWater::SETTING_FOG_COLOR("water_fog_color");
diff --git a/indra/llmessage/tests/test_llsdmessage_peer.py b/indra/llmessage/tests/test_llsdmessage_peer.py
index 8e9b6c09e7..ff8f40a144 100755
--- a/indra/llmessage/tests/test_llsdmessage_peer.py
+++ b/indra/llmessage/tests/test_llsdmessage_peer.py
@@ -33,7 +33,6 @@ import os
 import sys
 from http.server import HTTPServer, BaseHTTPRequestHandler
 
-from llsd.fastest_elementtree import parse as xml_parse
 import llsd
 from testrunner import freeport, run, debug, VERBOSE
 import time
diff --git a/indra/newview/CMakeLists.txt b/indra/newview/CMakeLists.txt
index dbd1f1b4ac..f23e4fa849 100644
--- a/indra/newview/CMakeLists.txt
+++ b/indra/newview/CMakeLists.txt
@@ -2141,20 +2141,6 @@ if (PACKAGE AND (RELEASE_CRASH_REPORTING OR NON_RELEASE_CRASH_REPORTING) AND VIE
         )
       add_custom_target(dsym_generate DEPENDS "${VIEWER_APP_DSYM}")
       add_dependencies(dsym_generate ${VIEWER_BINARY_NAME})
-      add_custom_command(OUTPUT "${VIEWER_SYMBOL_FILE}"
-        # See above comments about "tar ...j"
-        COMMAND "tar"
-        ARGS
-          "cjf"
-          "${VIEWER_SYMBOL_FILE}"
-          "-C"
-          "${VIEWER_APP_DSYM}/.."
-          "${product}.dSYM"
-        DEPENDS "${VIEWER_APP_DSYM}"
-        COMMENT "Packing dSYM into ${VIEWER_SYMBOL_FILE}"
-        )
-      add_custom_target(dsym_tarball DEPENDS "${VIEWER_SYMBOL_FILE}")
-      add_dependencies(dsym_tarball dsym_generate)
       add_custom_command(OUTPUT "${VIEWER_APP_XCARCHIVE}"
         COMMAND "zip"
         ARGS
@@ -2172,16 +2158,15 @@ if (PACKAGE AND (RELEASE_CRASH_REPORTING OR NON_RELEASE_CRASH_REPORTING) AND VIE
       add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/dsym.stamp"
         COMMAND rm -rf "${VIEWER_APP_DSYM}"
         COMMAND touch "${CMAKE_CURRENT_BINARY_DIR}/dsym.stamp"
-        DEPENDS "${VIEWER_SYMBOL_FILE}" "${VIEWER_APP_XCARCHIVE}"
+        DEPENDS "${VIEWER_APP_XCARCHIVE}"
         COMMENT "Cleaning up dSYM"
         )
       add_custom_target(generate_symbols DEPENDS
         "${VIEWER_APP_DSYM}"
-        "${VIEWER_SYMBOL_FILE}"
         "${VIEWER_APP_XCARCHIVE}"
         "${CMAKE_CURRENT_BINARY_DIR}/dsym.stamp"
         )
-      add_dependencies(generate_symbols dsym_tarball dsym_xcarchive)
+      add_dependencies(generate_symbols dsym_xcarchive)
     endif (DARWIN)
     if (LINUX)
       # TBD
diff --git a/indra/newview/installers/windows/installer_template.nsi b/indra/newview/installers/windows/installer_template.nsi
index ed37f541c8..962d6c060c 100644
--- a/indra/newview/installers/windows/installer_template.nsi
+++ b/indra/newview/installers/windows/installer_template.nsi
@@ -26,7 +26,6 @@
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

 ;; Compiler flags

 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

-Unicode true

 SetOverwrite on				# Overwrite files

 SetCompress auto			# Compress if saves space

 SetCompressor /solid lzma	# Compress whole installer as one block

diff --git a/indra/newview/llappviewer.cpp b/indra/newview/llappviewer.cpp
index 31a87bbde1..417b39501b 100644
--- a/indra/newview/llappviewer.cpp
+++ b/indra/newview/llappviewer.cpp
@@ -3557,7 +3557,7 @@ void LLAppViewer::writeSystemInfo()
 	gDebugInfo["ClientInfo"]["MajorVersion"] = LLVersionInfo::instance().getMajor();
 	gDebugInfo["ClientInfo"]["MinorVersion"] = LLVersionInfo::instance().getMinor();
 	gDebugInfo["ClientInfo"]["PatchVersion"] = LLVersionInfo::instance().getPatch();
-	gDebugInfo["ClientInfo"]["BuildVersion"] = LLVersionInfo::instance().getBuild();
+	gDebugInfo["ClientInfo"]["BuildVersion"] = std::to_string(LLVersionInfo::instance().getBuild());
 	gDebugInfo["ClientInfo"]["AddressSize"] = LLVersionInfo::instance().getAddressSize();
 
 	gDebugInfo["CAFilename"] = gDirUtilp->getCAFile();
@@ -5515,7 +5515,7 @@ void LLAppViewer::handleLoginComplete()
 	gDebugInfo["ClientInfo"]["MajorVersion"] = LLVersionInfo::instance().getMajor();
 	gDebugInfo["ClientInfo"]["MinorVersion"] = LLVersionInfo::instance().getMinor();
 	gDebugInfo["ClientInfo"]["PatchVersion"] = LLVersionInfo::instance().getPatch();
-	gDebugInfo["ClientInfo"]["BuildVersion"] = LLVersionInfo::instance().getBuild();
+	gDebugInfo["ClientInfo"]["BuildVersion"] = std::to_string(LLVersionInfo::instance().getBuild());
 
 	LLParcel* parcel = LLViewerParcelMgr::getInstance()->getAgentParcel();
 	if ( parcel && parcel->getMusicURL()[0])
diff --git a/indra/newview/llenvironment.h b/indra/newview/llenvironment.h
index 64fd170e43..1c8a68ae02 100644
--- a/indra/newview/llenvironment.h
+++ b/indra/newview/llenvironment.h
@@ -42,6 +42,8 @@
 
 #include <boost/signals2.hpp>
 
+#include <array>
+
 //-------------------------------------------------------------------------
 class LLViewerCamera;
 class LLParcel;
diff --git a/indra/newview/llimview.cpp b/indra/newview/llimview.cpp
index 6880cf2171..61a01d7418 100644
--- a/indra/newview/llimview.cpp
+++ b/indra/newview/llimview.cpp
@@ -72,6 +72,8 @@
 #include "llcorehttputil.h"
 #include "lluiusage.h"
 
+#include <array>
+
 const static std::string ADHOC_NAME_SUFFIX(" Conference");
 
 const static std::string NEARBY_P2P_BY_OTHER("nearby_P2P_by_other");
diff --git a/indra/newview/lllogchat.cpp b/indra/newview/lllogchat.cpp
index ba82ff0b0f..8c03292361 100644
--- a/indra/newview/lllogchat.cpp
+++ b/indra/newview/lllogchat.cpp
@@ -41,7 +41,7 @@
 
 #include <boost/algorithm/string/trim.hpp>
 #include <boost/algorithm/string/replace.hpp>
-#include <boost/regex/v4/match_results.hpp>
+#include <boost/regex.hpp>
 #include <boost/foreach.hpp>
 
 #if LL_MSVC
diff --git a/indra/newview/llpanellogin.cpp b/indra/newview/llpanellogin.cpp
index 8f1e57e44c..36fb6f8097 100644
--- a/indra/newview/llpanellogin.cpp
+++ b/indra/newview/llpanellogin.cpp
@@ -300,7 +300,7 @@ LLPanelLogin::LLPanelLogin(const LLRect &rect,
 	setDefaultBtn(def_btn);
 
 	std::string channel = LLVersionInfo::instance().getChannel();
-	std::string version = llformat("%s (%d)",
+	std::string version = llformat("%s (%ld)",
 								   LLVersionInfo::instance().getShortVersion().c_str(),
 								   LLVersionInfo::instance().getBuild());
 	
@@ -894,7 +894,7 @@ void LLPanelLogin::loadLoginPage()
 	}
 
 	// Channel and Version
-	params["version"] = llformat("%s (%d)",
+	params["version"] = llformat("%s (%ld)",
 								 LLVersionInfo::instance().getShortVersion().c_str(),
 								 LLVersionInfo::instance().getBuild());
 	params["channel"] = LLVersionInfo::instance().getChannel();
diff --git a/indra/newview/lltranslate.cpp b/indra/newview/lltranslate.cpp
index c37c955e8d..1e21c3fa05 100644
--- a/indra/newview/lltranslate.cpp
+++ b/indra/newview/lltranslate.cpp
@@ -160,7 +160,7 @@ void LLTranslationAPIHandler::verifyKeyCoro(LLTranslate::EService service, LLSD
     LLCore::HttpHeaders::ptr_t httpHeaders(new LLCore::HttpHeaders);
 
 
-    std::string user_agent = llformat("%s %d.%d.%d (%d)",
+    std::string user_agent = llformat("%s %d.%d.%d (%ld)",
         LLVersionInfo::instance().getChannel().c_str(),
         LLVersionInfo::instance().getMajor(),
         LLVersionInfo::instance().getMinor(),
@@ -215,7 +215,7 @@ void LLTranslationAPIHandler::translateMessageCoro(LanguagePair_t fromTo, std::s
     LLCore::HttpHeaders::ptr_t httpHeaders(new LLCore::HttpHeaders);
 
 
-    std::string user_agent = llformat("%s %d.%d.%d (%d)",
+    std::string user_agent = llformat("%s %d.%d.%d (%ld)",
         LLVersionInfo::instance().getChannel().c_str(),
         LLVersionInfo::instance().getMajor(),
         LLVersionInfo::instance().getMinor(),
diff --git a/indra/newview/llversioninfo.cpp b/indra/newview/llversioninfo.cpp
index 376a7fce76..62bfa24e29 100644
--- a/indra/newview/llversioninfo.cpp
+++ b/indra/newview/llversioninfo.cpp
@@ -91,7 +91,7 @@ S32 LLVersionInfo::getPatch()
 	return LL_VIEWER_VERSION_PATCH;
 }
 
-S32 LLVersionInfo::getBuild()
+S64 LLVersionInfo::getBuild()
 {
 	return LL_VIEWER_VERSION_BUILD;
 }
diff --git a/indra/newview/llversioninfo.h b/indra/newview/llversioninfo.h
index 02ff0c094a..122bd5c47a 100644
--- a/indra/newview/llversioninfo.h
+++ b/indra/newview/llversioninfo.h
@@ -61,7 +61,7 @@ public:
 	S32 getPatch();
 
 	/// return the build number as an integer
-	S32 getBuild();
+	S64 getBuild();
 
 	/// return the full viewer version as a string like "2.0.0.200030"
 	std::string getVersion();
diff --git a/indra/newview/llweb.cpp b/indra/newview/llweb.cpp
index c4d873dd22..9afe332025 100644
--- a/indra/newview/llweb.cpp
+++ b/indra/newview/llweb.cpp
@@ -160,7 +160,7 @@ std::string LLWeb::expandURLSubstitutions(const std::string &url,
 	substitution["VERSION_MAJOR"] = LLVersionInfo::instance().getMajor();
 	substitution["VERSION_MINOR"] = LLVersionInfo::instance().getMinor();
 	substitution["VERSION_PATCH"] = LLVersionInfo::instance().getPatch();
-	substitution["VERSION_BUILD"] = LLVersionInfo::instance().getBuild();
+	substitution["VERSION_BUILD"] = std::to_string(LLVersionInfo::instance().getBuild());
 	substitution["CHANNEL"] = LLVersionInfo::instance().getChannel();
 	substitution["GRID"] = LLGridManager::getInstance()->getGridId();
 	substitution["GRID_LOWERCASE"] = utf8str_tolower(LLGridManager::getInstance()->getGridId());
diff --git a/indra/newview/llxmlrpctransaction.cpp b/indra/newview/llxmlrpctransaction.cpp
index 8d178dbbdc..b851b7ad5c 100644
--- a/indra/newview/llxmlrpctransaction.cpp
+++ b/indra/newview/llxmlrpctransaction.cpp
@@ -384,7 +384,7 @@ void LLXMLRPCTransaction::Impl::init(XMLRPC_REQUEST request, bool useGzip, const
 
 	httpHeaders->append(HTTP_OUT_HEADER_CONTENT_TYPE, HTTP_CONTENT_TEXT_XML);
 
-    std::string user_agent = llformat("%s %d.%d.%d (%d)",
+    std::string user_agent = llformat("%s %d.%d.%d (%ld)",
         LLVersionInfo::instance().getChannel().c_str(),
         LLVersionInfo::instance().getMajor(),
         LLVersionInfo::instance().getMinor(),
diff --git a/indra/newview/viewer_manifest.py b/indra/newview/viewer_manifest.py
index 3a7c7d7f46..f6282743bb 100755
--- a/indra/newview/viewer_manifest.py
+++ b/indra/newview/viewer_manifest.py
@@ -28,7 +28,6 @@ $/LicenseInfo$
 """
 import errno
 import glob
-import itertools
 import json
 import os
 import os.path
@@ -36,12 +35,9 @@ import plistlib
 import random
 import re
 import shutil
-import stat
 import subprocess
 import sys
-import tarfile
 import time
-import zipfile
 
 viewer_dir = os.path.dirname(__file__)
 # Add indra/lib/python to our path so we don't have to muck with PYTHONPATH.
@@ -410,6 +406,15 @@ class ViewerManifest(LLManifest):
 
         return os.path.relpath(abspath(path), abspath(base))
 
+    def set_github_output_path(self, variable, path):
+        self.set_github_output(variable, os.path.join(self.get_dst_prefix(), path))
+
+    def set_github_output(self, variable, value):
+        GITHUB_OUTPUT = os.getenv('GITHUB_OUTPUT')
+        if GITHUB_OUTPUT:
+            with open(GITHUB_OUTPUT, 'a') as outf:
+                print('='.join((variable, value)), file=outf)
+
 
 class WindowsManifest(ViewerManifest):
     # We want the platform, per se, for every Windows build to be 'win'. The
@@ -484,6 +489,8 @@ class WindowsManifest(ViewerManifest):
         if self.is_packaging_viewer():
             # Find secondlife-bin.exe in the 'configuration' dir, then rename it to the result of final_exe.
             self.path(src='%s/secondlife-bin.exe' % self.args['configuration'], dst=self.final_exe())
+            # emit that as one of the GitHub step outputs
+            self.set_github_output_path('viewer_exe', self.final_exe())
 
             with self.prefix(src=os.path.join(pkgdir, "VMP")):
                 # include the compiled launcher scripts so that it gets included in the file_list
@@ -846,6 +853,8 @@ class DarwinManifest(ViewerManifest):
     def construct(self):
         # copy over the build result (this is a no-op if run within the xcode script)
         self.path(os.path.join(self.args['configuration'], self.channel()+".app"), dst="")
+        # capture the entire destination app bundle
+        self.set_github_output_path('viewer_exe', '')
 
         pkgdir = os.path.join(self.args['build'], os.pardir, 'packages')
         relpkgdir = os.path.join(pkgdir, "lib", "release")
@@ -1286,6 +1295,7 @@ class DarwinManifest(ViewerManifest):
                                                    'Keychains', 'viewer.keychain')
                     self.run_command(['security', 'unlock-keychain',
                                       '-p', keychain_pwd, viewer_keychain])
+                    sign_retries=3
                     sign_retry_wait=15
                     resources = app_in_dmg + "/Contents/Resources/"
                     plain_sign = glob.glob(resources + "llplugin/*.dylib")
@@ -1294,9 +1304,10 @@ class DarwinManifest(ViewerManifest):
                         resources + "SLPlugin.app/Contents/MacOS/SLPlugin",
                         app_in_dmg,
                         ]
-                    for attempt in range(3):
+                    for attempt in range(sign_retries):
                         if attempt: # second or subsequent iteration
-                            print("codesign failed, waiting {:d} seconds before retrying".format(sign_retry_wait),
+                            print(f"codesign attempt {attempt+1} failed, "
+                                  f"waiting {sign_retry_wait:d} seconds before retrying",
                                   file=sys.stderr)
                             time.sleep(sign_retry_wait)
                             sign_retry_wait*=2
@@ -1327,14 +1338,37 @@ class DarwinManifest(ViewerManifest):
                             # 'err' goes out of scope
                             sign_failed = err
                     else:
-                        print("Maximum codesign attempts exceeded; giving up", file=sys.stderr)
+                        print(f"{sign_retries} codesign attempts failed; giving up",
+                              file=sys.stderr)
                         raise sign_failed
                     self.run_command(['spctl', '-a', '-texec', '-vvvv', app_in_dmg])
-                    self.run_command([self.src_path_of("installers/darwin/apple-notarize.sh"), app_in_dmg])
+                    self.run_command([self.src_path_of("installers/darwin/apple-notarize.sh"),
+                                      app_in_dmg])
 
         finally:
             # Unmount the image even if exceptions from any of the above 
-            self.run_command(['hdiutil', 'detach', '-force', devfile])
+            detach_retries = 3
+            detach_retry_wait = 2
+            # Empirically, on GitHub we've hit errors like:
+            # hdiutil: couldn't eject "disk10" - Resource busy
+            for attempt in range(detach_retries):
+                if attempt:     # second or subsequent iteration
+                    print(f'detach failed, waiting {detach_retry_wait} seconds before retrying',
+                          file=sys.stderr)
+                    # Try waiting a bit to see if that improves reliability.
+                    time.sleep(detach_retry_wait)
+                    detach_retry_wait *= 2
+
+                try:
+                    self.run_command(['hdiutil', 'detach', '-force', devfile])
+                    # if no exception, the detach worked
+                    break
+                except ManifestError as err:
+                    detach_failed = err
+            else:
+                print(f'{detach_retries} detach attempts failed', file=sys.stderr)
+                ## can we carry on anyway??
+                ## raise detach_failed
 
         print("Converting temp disk image to final disk image")
         self.run_command(['hdiutil', 'convert', sparsename, '-format', 'UDZO',
diff --git a/indra/test/namedtempfile.h b/indra/test/namedtempfile.h
index 7d59cad32c..525a35000d 100644
--- a/indra/test/namedtempfile.h
+++ b/indra/test/namedtempfile.h
@@ -13,15 +13,16 @@
 #define LL_NAMEDTEMPFILE_H
 
 #include "llerror.h"
-#include "llapr.h"
-#include "apr_file_io.h"
+#include "llstring.h"
+#include "stringize.h"
 #include <string>
-#include <boost/function.hpp>
-#include <boost/phoenix/core/argument.hpp>
-#include <boost/phoenix/operator/bitwise.hpp>
+#include <boost/filesystem.hpp>
+#include <boost/filesystem/fstream.hpp>
 #include <boost/noncopyable.hpp>
+#include <functional>
 #include <iostream>
 #include <sstream>
+#include <string_view>
 
 /**
  * Create a text file with specified content "somewhere in the
@@ -31,134 +32,106 @@ class NamedTempFile: public boost::noncopyable
 {
     LOG_CLASS(NamedTempFile);
 public:
-    NamedTempFile(const std::string& pfx, const std::string& content, apr_pool_t* pool=gAPRPoolp):
-        mPool(pool)
+    NamedTempFile(const std::string_view& pfx,
+                  const std::string_view& content,
+                  const std::string_view& sfx=std::string_view(""))
     {
-        createFile(pfx, boost::phoenix::placeholders::arg1 << content);
+        createFile(pfx, [&content](std::ostream& out){ out << content; }, sfx);
     }
 
-    // Disambiguate when passing string literal
-    NamedTempFile(const std::string& pfx, const char* content, apr_pool_t* pool=gAPRPoolp):
-        mPool(pool)
+    // Disambiguate when passing string literal -- unclear why a string
+    // literal should be ambiguous wrt std::string_view and Streamer
+    NamedTempFile(const std::string_view& pfx,
+                  const char* content,
+                  const std::string_view& sfx=std::string_view(""))
     {
-        createFile(pfx, boost::phoenix::placeholders::arg1 << content);
+        createFile(pfx, [&content](std::ostream& out){ out << content; }, sfx);
     }
 
     // Function that accepts an ostream ref and (presumably) writes stuff to
     // it, e.g.:
     // (boost::phoenix::placeholders::arg1 << "the value is " << 17 << '\n')
-    typedef boost::function<void(std::ostream&)> Streamer;
+    typedef std::function<void(std::ostream&)> Streamer;
 
-    NamedTempFile(const std::string& pfx, const Streamer& func, apr_pool_t* pool=gAPRPoolp):
-        mPool(pool)
+    NamedTempFile(const std::string_view& pfx,
+                  const Streamer& func,
+                  const std::string_view& sfx=std::string_view(""))
     {
-        createFile(pfx, func);
+        createFile(pfx, func, sfx);
     }
 
     virtual ~NamedTempFile()
     {
-        ll_apr_assert_status(apr_file_remove(mPath.c_str(), mPool));
+        boost::filesystem::remove(mPath);
     }
 
-    virtual std::string getName() const { return mPath; }
+    std::string getName() const { return mPath.string(); }
 
     void peep()
     {
         std::cout << "File '" << mPath << "' contains:\n";
-        std::ifstream reader(mPath.c_str());
+        boost::filesystem::ifstream reader(mPath);
         std::string line;
         while (std::getline(reader, line))
             std::cout << line << '\n';
         std::cout << "---\n";
     }
 
+    static boost::filesystem::path temp_path(const std::string_view& pfx="",
+                                             const std::string_view& sfx="")
+    {
+        // This variable is set by GitHub actions and is the recommended place
+        // to put temp files belonging to an actions job.
+        const char* RUNNER_TEMP = getenv("RUNNER_TEMP");
+        boost::filesystem::path tempdir{
+            // if RUNNER_TEMP is set and not empty
+            (RUNNER_TEMP && *RUNNER_TEMP)?
+            boost::filesystem::path(RUNNER_TEMP) : // use RUNNER_TEMP if available
+            boost::filesystem::temp_directory_path()}; // else canonical temp dir
+        boost::filesystem::path tempname{
+            // use filename template recommended by unique_path() doc, but
+            // with underscores instead of hyphens: some use cases involve
+            // temporary Python scripts
+            tempdir / stringize(pfx, "%%%%_%%%%_%%%%_%%%%", sfx) };
+        return boost::filesystem::unique_path(tempname);
+    }
+
 protected:
-    void createFile(const std::string& pfx, const Streamer& func)
+    void createFile(const std::string_view& pfx,
+                    const Streamer& func,
+                    const std::string_view& sfx)
     {
         // Create file in a temporary place.
-        const char* tempdir = NULL;
-        ll_apr_assert_status(apr_temp_dir_get(&tempdir, mPool));
-
-        // Construct a temp filename template in that directory.
-        char *tempname = NULL;
-        ll_apr_assert_status(apr_filepath_merge(&tempname,
-                                                tempdir,
-                                                (pfx + "XXXXXX").c_str(),
-                                                0,
-                                                mPool));
-
-        // Create a temp file from that template.
-        apr_file_t* fp = NULL;
-        ll_apr_assert_status(apr_file_mktemp(&fp,
-                                             tempname,
-                                             APR_CREATE | APR_WRITE | APR_EXCL,
-                                             mPool));
-        // apr_file_mktemp() alters tempname with the actual name. Not until
-        // now is it valid to capture as our mPath.
-        mPath = tempname;
-
+        mPath = temp_path(pfx, sfx);
+        boost::filesystem::ofstream out{ mPath };
         // Write desired content.
-        std::ostringstream out;
-        // Stream stuff to it.
         func(out);
-
-        std::string data(out.str());
-        apr_size_t writelen(data.length());
-        ll_apr_assert_status(apr_file_write(fp, data.c_str(), &writelen));
-        ll_apr_assert_status(apr_file_close(fp));
-        llassert_always(writelen == data.length());
     }
 
-    std::string mPath;
-    apr_pool_t* mPool;
+    boost::filesystem::path mPath;
 };
 
 /**
  * Create a NamedTempFile with a specified filename extension. This is useful
  * when, for instance, you must be able to use the file in a Python import
  * statement.
- *
- * A NamedExtTempFile actually has two different names. We retain the original
- * no-extension name as a placeholder in the temp directory to ensure
- * uniqueness; to that we link the name plus the desired extension. Naturally,
- * both must be removed on destruction.
  */
 class NamedExtTempFile: public NamedTempFile
 {
     LOG_CLASS(NamedExtTempFile);
 public:
-    NamedExtTempFile(const std::string& ext, const std::string& content, apr_pool_t* pool=gAPRPoolp):
-        NamedTempFile(remove_dot(ext), content, pool),
-        mLink(mPath + ensure_dot(ext))
-    {
-        linkto(mLink);
-    }
+    NamedExtTempFile(const std::string& ext, const std::string_view& content):
+        NamedTempFile(remove_dot(ext), content, ensure_dot(ext))
+    {}
 
     // Disambiguate when passing string literal
-    NamedExtTempFile(const std::string& ext, const char* content, apr_pool_t* pool=gAPRPoolp):
-        NamedTempFile(remove_dot(ext), content, pool),
-        mLink(mPath + ensure_dot(ext))
-    {
-        linkto(mLink);
-    }
+    NamedExtTempFile(const std::string& ext, const char* content):
+        NamedTempFile(remove_dot(ext), content, ensure_dot(ext))
+    {}
 
-    NamedExtTempFile(const std::string& ext, const Streamer& func, apr_pool_t* pool=gAPRPoolp):
-        NamedTempFile(remove_dot(ext), func, pool),
-        mLink(mPath + ensure_dot(ext))
-    {
-        linkto(mLink);
-    }
-
-    virtual ~NamedExtTempFile()
-    {
-        ll_apr_assert_status(apr_file_remove(mLink.c_str(), mPool));
-    }
-
-    // Since the caller has gone to the trouble to create the name with the
-    // extension, that should be the name we return. In this class, mPath is
-    // just a placeholder to ensure that future createFile() calls won't
-    // collide.
-    virtual std::string getName() const { return mLink; }
+    NamedExtTempFile(const std::string& ext, const Streamer& func):
+        NamedTempFile(remove_dot(ext), func, ensure_dot(ext))
+    {}
 
     static std::string ensure_dot(const std::string& ext)
     {
@@ -175,7 +148,7 @@ public:
         {
             return ext;
         }
-        return std::string(".") + ext;
+        return "." + ext;
     }
 
     static std::string remove_dot(const std::string& ext)
@@ -187,19 +160,6 @@ public:
         }
         return ext.substr(found);
     }
-
-private:
-    void linkto(const std::string& path)
-    {
-        // This method assumes that since mPath (without extension) is
-        // guaranteed by apr_file_mktemp() to be unique, then (mPath + any
-        // extension) is also unique. This is likely, though not guaranteed:
-        // files could be created in the same temp directory other than by
-        // this class.
-        ll_apr_assert_status(apr_file_link(mPath.c_str(), path.c_str()));
-    }
-
-    std::string mLink;
 };
 
 #endif /* ! defined(LL_NAMEDTEMPFILE_H) */
diff --git a/indra/test/test.cpp b/indra/test/test.cpp
index bb48216b2b..04f32831b7 100644
--- a/indra/test/test.cpp
+++ b/indra/test/test.cpp
@@ -97,10 +97,10 @@ public:
 class RecordToTempFile : public LLError::Recorder, public boost::noncopyable
 {
 public:
-	RecordToTempFile(apr_pool_t* pPool)
+	RecordToTempFile()
 		: LLError::Recorder(),
 		boost::noncopyable(),
-		mTempFile("log", "", pPool),
+		mTempFile("log", ""),
 		mFile(mTempFile.getName().c_str())
 	{
 	}
@@ -141,11 +141,11 @@ private:
 class LLReplayLogReal: public LLReplayLog, public boost::noncopyable
 {
 public:
-	LLReplayLogReal(LLError::ELevel level, apr_pool_t* pool)
+	LLReplayLogReal(LLError::ELevel level)
 		: LLReplayLog(),
 		boost::noncopyable(),
 		mOldSettings(LLError::saveAndResetSettings()),
-		mRecorder(new RecordToTempFile(pool))
+		mRecorder(new RecordToTempFile())
 	{
 		LLError::setFatalFunction(wouldHaveCrashed);
 		LLError::setDefaultLevel(level);
@@ -624,7 +624,7 @@ int main(int argc, char **argv)
 		if (LOGFAIL && *LOGFAIL)
 		{
 			LLError::ELevel level = LLError::decodeLevel(LOGFAIL);
-			replayer.reset(new LLReplayLogReal(level, gAPRPoolp));
+			replayer.reset(new LLReplayLogReal(level));
 		}
 	}
 	LLError::setFatalFunction(wouldHaveCrashed);