[cmake-developers] FindPNG.cmake doesn't return a LIBRARY_DIR variable

[René J.V. Bertin]

Hi,

I routinely use cmake to build projects for installation into a prefix (/opt/local) and that use libraries from that location which also exist in the system locations (typically in older versions, in that case).

I thus have .pc files under /opt/local which generate linker instructions of the type "-L/opt/local/lib -lfoo".

You'd expect this should work, but (too) often I still get linker errors about symbols not being found which upon verification are in fact provided by the intended library. In that case the -L/opt/local/lib is typically given only once on the linker command line ("way" before the corresponding -l argument), or not at all. See the example below, where I don't see the -L option at all (linker output and data from CMakeCache.txt after the HUGE linker command).

Initially I thought this was a case where one shouldn't filter out identical -L options because the linker could limit their scope to just the -l option immediately following the -L, but in this case it appears that FindPNG.cmake simply doesn't consider the possibility that libpng might be found in a location that isn't in the standard library search path. IOW, FindPNG.cmake doesn't return a PNG_LIBRARY_DIR variable, and provides the full path only in an obsolete variable (PNG_LIBRARY). And for some reason, the command `target_link_libraries(digikamcore ... ${PNG_LIBRARIES} ...)` is translated into `-lpng -lz` .
Is that a bug or feature?

cd /path/todigikam/work/build/core/app && /opt/local/bin/cmake -E cmake_link_script CMakeFiles/digikamcore.dir/link.txt --verbose=1
/opt/local/bin/clang++-mp-4.0 -fPIC -O3 -g -DNDEBUG -std=c++11 -m64 -std=c++0x  -Wno-gnu-zero-variadic-macro-arguments -Wall -Wextra -Wcast-align -Wchar-subscripts -Wformat-security -Wno-long-long -Wpointer-arith -Wundef -Wnon-virtual-dtor -Woverloaded-virtual -Werror=return-type -Wvla -Wdate-time  -std=c++0x -fno-operator-names -Wno-gnu-zero-variadic-macro-arguments -Wall -Wextra -Wcast-align -Wchar-subscripts -Wformat-security -Wno-long-long -Wpointer-arith -Wundef -Wnon-virtual-dtor -Woverloaded-virtual -Werror=return-type -Wvla -Wdate-time  -std=c++0x -fno-operator-names -Wno-gnu-zero-variadic-macro-arguments -Wall -Wextra -Wcast-align -Wchar-subscripts -Wformat-security -Wno-long-long -Wpointer-arith -Wundef -Wnon-virtual-dtor -Woverloaded-virtual -Werror=return-type -Wvla -Wdate-time  -fexceptions -UQT_NO_EXCEPTIONS -Wl,--no-undefined -Wl,--fatal-warnings -Wl,--enable-new-dtags -Wl,--no-undefined -Wl,--fatal-warnings -Wl,--enable-new-dtags -Wl,--no-undefined -Wl,--fatal-warnings -Wl,--enable-new-dtags -Wl,-R,/opt/local/lib -shared -Wl,-soname,libdigikamcore.so.5.6.0 -o libdigikamcore.so.5.6.0 CMakeFiles/digikamcore.dir/utils/digikam_debug.cpp.o CMakeFiles/digikamcore.dir/digikamcore_autogen/moc_compilation.cpp.o ../libs/database/CMakeFiles/digikamdatabasecore_src.dir/server/databaseserverstarter.cpp.o ../libs/database/CMakeFiles/digikamdatabasecore_src.dir/server/databaseservererror.cpp.o ../libs/database/CMakeFiles/digikamdatabasecore_src.dir/server/databaseserver.cpp.o ../libs/database/CMakeFiles/digikamdatabasecore_src.dir/engine/dbengineconfigloader.cpp.o ../libs/database/CMakeFiles/digikamdatabasecore_src.dir/engine/dbengineconfig.cpp.o ../libs/database/CMakeFiles/digikamdatabasecore_src.dir/engine/dbengineactiontype.cpp.o ../libs/database/CMakeFiles/digikamdatabasecore_src.dir/engine/dbengineerrorhandler.cpp.o ../libs/database/CMakeFiles/digikamdatabasecore_src.dir/engine/dbengineguierrorhandler.cpp.o 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/opt/local/lib/x86_64-linux-gnu/libKF5Completion.so.5.35.0 /opt/local/lib/x86_64-linux-gnu/libKF5ConfigGui.so.5.35.0 /opt/local/libexec/qt5/lib/libQt5Xml.so.5.8.0 /opt/local/lib/x86_64-linux-gnu/libKF5ConfigCore.so.5.35.0 /opt/local/lib/x86_64-linux-gnu/libKF5WidgetsAddons.so.5.35.0 /opt/local/lib/x86_64-linux-gnu/libKF5SonnetUi.so.5.35.0 /opt/local/libexec/qt5/lib/libQt5Widgets.so.5.8.0 /opt/local/libexec/qt5/lib/libQt5Gui.so.5.8.0 -lical -licalss /opt/local/libexec/qt5/lib/libQt5Core.so.5.8.0 -Wl,-rpath-link,/opt/local/lib/x86_64-linux-gnu
../libs/dimg/CMakeFiles/dimg_src.dir/loaders/pngloader.cpp.o: In function `Digikam::PNGLoader::load(QString const&, Digikam::DImgLoaderObserver*)':
/path/to/digikam/work/digikam-5.6.0/core/libs/dimg/loaders/pngloader.cpp:219: undefined reference to `png_set_longjmp_fn'

CMakeCache.txt contains this:
PNG_LIBRARY_DEBUG:FILEPATH=PNG_LIBRARY_DEBUG-NOTFOUND
PNG_LIBRARY_RELEASE:FILEPATH=/opt/local/lib/libpng.so
PNG_PNG_INCLUDE_DIR:PATH=/opt/local/include
//Details about finding PNG
FIND_PACKAGE_MESSAGE_DETAILS_PNG:INTERNAL=[/opt/local/lib/libpng.so][/opt/local/include][v1.6.29()]
//ADVANCED property for variable: PNG_LIBRARY_DEBUG
PNG_LIBRARY_DEBUG-ADVANCED:INTERNAL=1
//ADVANCED property for variable: PNG_LIBRARY_RELEASE
PNG_LIBRARY_RELEASE-ADVANCED:INTERNAL=1
//ADVANCED property for variable: PNG_PNG_INCLUDE_DIR
PNG_PNG_INCLUDE_DIR-ADVANCED:INTERNAL=1

the digikamcore target_link_libraries command uses ${PNG_LIBRARIES}:
PNG_LIBRARIES=/opt/local/lib/libpng.so;/opt/local/lib/libz.so