FFmpeg records its library dir in INTERFACE_LINK_DIRECTORIES, its
INTERFACE_LINK_LIBRARIES are library names without directories.
Currently FFmpeg's linker flags in pri and prl files is broken,
such as "-llibavcodec.a" in QMAKE_PRL_LIBS (should be "-lavcodec"),
and "libavformat.a ws2_32" in QMAKE_LIBS_FFMPEG (should be
"-lavformat -lws2_32").
Fix this by enabling qt_get_library_name_without_prefix_and_suffix()
and qt_get_library_with_link_flag() to handle args like "libavformat.a"
and "ws2_32", to produce correct -l flags.
Also avoid adding duplicate "-L" flags in pri and prl files, since all
FFmpeg libraries are installed in the same location.
(Amends 2c49f85380 and
2915921ad2)
On a Mingw static build with static FFmpeg, and FFmpeg libraries isn't
installed in compiler's implicit link directories. Before this change:
// mkspecs/modules/qt_lib_multimedia_private.pri
QMAKE_LIBS_FFMPEG = libswscale.a libswscale.a libswresample.a
libswresample.a libavutil.a bcrypt libavutil.a libavformat.a ws2_32
secur32 libavformat.a libavcodec.a ole32 strmiids ole32 mfuuid
libavcodec.a
// plugins/multimedia/ffmpegmediaplugin.prl
QMAKE_PRL_LIBS = ... -llibavformat.a -lmfuuid -lstrmiids -lole32
-llibavcodec.a -llibswresample.a -llibswscale.a -lbcrypt -llibavutil.a
After this change:
// mkspecs/modules/qt_lib_multimedia_private.pri
QMAKE_LIBS_FFMPEG = -lswscale -lswscale -lswresample -lswresample
-lavutil -lbcrypt -lavutil -lavformat -lws2_32 -lsecur32 -lavformat
-lavcodec -lole32 -lstrmiids -lole32 -lmfuuid -lavcodec
// plugins/multimedia/ffmpegmediaplugin.prl
QMAKE_PRL_LIBS = ... -lavformat -lmfuuid -lstrmiids -lole32 -lavcodec
-lswresample -lswscale -lbcrypt -lavutil
Fixes: QTBUG-126773
Pick-to: 6.7
Change-Id: I71a06c960a4f9b6010fc2847cc08833d58b74e1c
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
(cherry picked from commit e154da485e83d2867da391088ea4acb31eef6293)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
7150ad74e1