MAINT-5011: Try to enrich catch (...) logging throughout viewer.

Turns out we have a surprising number of catch (...) clauses in the viewer
code base. If all we currently do is

    LL_ERRS() << "unknown exception" << LL_ENDL;

then call CRASH_ON_UNHANDLED_EXCEPTION() instead. If what we do is

    LL_WARNS() << "unknown exception" << LL_ENDL;

then call LOG_UNHANDLED_EXCEPTION() instead.

Since many places need LOG_UNHANDLED_EXCEPTION() and nobody catches
LLContinueError yet, eliminate LLContinueError& parameter from
LOG_UNHANDLED_EXCEPTION(). This permits us to use the same log message as
CRASH_ON_UNHANDLED_EXCEPTION(), just with a different severity level.

Where a catch (...) clause actually provides contextual information, or makes
an error string, add boost::current_exception_diagnostic_information() to try
to figure out actual exception class and message.

1 files changed, 2 insertions, 1 deletions

diff --git a/indra/llmessage/llavatarnamecache.cpp b/indra/llmessage/llavatarnamecache.cpp
index 1ca5f58ae2..2dbbc80741 100644
--- a/indra/llmessage/llavatarnamecache.cpp
+++ b/indra/llmessage/llavatarnamecache.cpp
@@ -43,6 +43,7 @@
 #include "llcoros.h"
 #include "lleventcoro.h"
 #include "llcorehttputil.h"
+#include "llexception.h"
 
 #include <map>
 #include <set>
@@ -237,7 +238,7 @@ void LLAvatarNameCache::requestAvatarNameCache_(std::string url, std::vector<LLU
     }
     catch (...)
     {
-        LL_WARNS() << "Caught unknown exception." << LL_ENDL;
+        LOG_UNHANDLED_EXCEPTION();
     }
 }