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# -*- cmake -*-
include(Prebuilt)
set(PNG_FIND_QUIETLY ON)
set(PNG_FIND_REQUIRED ON)
if (USESYSTEMLIBS)
include(FindPNG)
else (USESYSTEMLIBS)
use_prebuilt_binary(libpng)
if (WINDOWS)
set(PNG_LIBRARIES libpng16)
set(PNG_INCLUDE_DIRS ${LIBS_PREBUILT_DIR}/include/libpng16)
elseif(DARWIN)
set(PNG_LIBRARIES png16)
set(PNG_INCLUDE_DIRS ${LIBS_PREBUILT_DIR}/include/libpng16)
else()
#
# When we have updated static libraries in competition with older
# shared libraries and we want the former to win, we need to do some
# extra work. The *_PRELOAD_ARCHIVES settings are invoked early
# and will pull in the entire archive to the binary giving it
# priority in symbol resolution. Beware of cmake moving the
# achive load itself to another place on the link command line. If
# that happens, you can try something like -Wl,-lpng16 here to hide
# the archive. Also be aware that the linker will not tolerate a
# second whole-archive load of the archive. See viewer's
# CMakeLists.txt for more information.
#
set(PNG_PRELOAD_ARCHIVES -Wl,--whole-archive png16 -Wl,--no-whole-archive)
set(PNG_LIBRARIES png16)
set(PNG_INCLUDE_DIRS ${LIBS_PREBUILT_DIR}/include/libpng16)
endif()
endif (USESYSTEMLIBS)
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