On Tue, Nov 19, 2013 at 7:34 PM, Frank Trampe <frank.tra...@gmail.com>wrote:
> As you're running it, gcc is trying to link statically (against > libgroove.a), so the contents of libgroove.so don't mean much. Are you > trying to link dynamically? > Yes I am trying to link dynamically. I'm confused - I thought using -l was dynamic linking and specifying -static and supplying .a files does static linking. Furthermore, when I link the exact same test.c file with the same gcc args against a libgroove installation that was built from source rather than from the PPA, it successfully links and runs. What could explain this behavior? > > Running nm -g on your static library shows that it includes undefined > static symbols for the functions that you list. If you link against those > libraries (libav and libsdl) when building test.c, this ought to work. > > > > On Tue, Nov 19, 2013 at 11:21 AM, Andrew Kelley <superjo...@gmail.com>wrote: > >> Hello - >> >> I just added a library to my ppa: >> https://launchpad.net/~andrewrk/+archive/libgroove >> so far so good, it installs on my system. But when I compile a program >> against it, I get linker errors - undefined symbols from libraries that my >> library depends on. This does not happen when I manually build from source. >> >> Any suggestions? >> >> Here are some more details. >> >> The problem: >> >> andy@andy-bx:~/tmp$ c99 -o test test.c -lgroove >> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libgroove.a(file.c.o): In >> function `cleanup_save': >> >> (.text+0x29): undefined reference to `av_free_packet' >> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libgroove.a(file.c.o): In >> function `cleanup_save': >> >> (.text+0x39): undefined reference to `avio_closep' >> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libgroove.a(file.c.o): In >> function `cleanup_save': >> >> (.text+0x54): undefined reference to `avformat_free_context' >> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libgroove.a(file.c.o): In >> function `cleanup_save': >> >> (.text+0xa1): undefined reference to `av_log' >> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libgroove.a(file.c.o): In >> function `groove_file_close': >> >> (.text+0xe6): undefined reference to `av_free_packet' >> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libgroove.a(file.c.o): In >> function `groove_file_close': >> >> (.text+0x105): undefined reference to `avcodec_close' >> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libgroove.a(file.c.o): In >> function `groove_file_close': >> >> (.text+0x12b): undefined reference to `avformat_close_input' >> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libgroove.a(file.c.o): In >> function `groove_file_close': >> >> (.text+0x139): undefined reference to `SDL_DestroyMutex' >> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libgroove.a(file.c.o): In >> function `groove_file_open': >> >> (.text+0x16f): undefined reference to `av_mallocz' >> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libgroove.a(file.c.o): In >> function `groove_file_open': >> >> (.text+0x18f): undefined reference to `SDL_CreateMutex' >> /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/libgroove.a(file.c.o): In >> function `groove_file_open': >> >> (.text+0x1a1): undefined reference to `avformat_alloc_context' >> ...(snip)... >> >> >> libav is a static dependency of libgroove, and SDL2 is a dynamic dependency. >> test.c uses only libgroove, it does not depend on libav or SDL2. >> >> >> andy@andy-bx:~$ ldd /usr/lib/libgroove.so.2.0.2 >> linux-vdso.so.1 => (0x00007fff499c9000) >> libbz2.so.1.0 => /lib/x86_64-linux-gnu/libbz2.so.1.0 >> (0x00007fc04ecde000) >> >> libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fc04eac5000) >> libmp3lame.so.0 => /usr/lib/x86_64-linux-gnu/libmp3lame.so.0 >> (0x00007fc04e837000) >> >> libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 >> (0x00007fc04e61a000) >> libSDL2-2.0.so.0 => /usr/lib/x86_64-linux-gnu/libSDL2-2.0.so.0 >> (0x00007fc04e346000) >> >> libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fc04df7d000) >> libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fc04dc79000) >> >> >> /lib64/ld-linux-x86-64.so.2 (0x00007fc04ff2a000) >> libasound.so.2 => /usr/lib/x86_64-linux-gnu/libasound.so.2 >> (0x00007fc04d989000) >> libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fc04d784000) >> >> >> >> libpulse-simple.so.0 => /usr/lib/x86_64-linux-gnu/libpulse-simple.so.0 >> (0x00007fc04d580000) >> libpulse.so.0 => /usr/lib/x86_64-linux-gnu/libpulse.so.0 >> (0x00007fc04d337000) >> >> libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 >> (0x00007fc04d001000) >> libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 >> (0x00007fc04cdef000) >> >> libXcursor.so.1 => /usr/lib/x86_64-linux-gnu/libXcursor.so.1 >> (0x00007fc04cbe5000) >> libXinerama.so.1 => /usr/lib/x86_64-linux-gnu/libXinerama.so.1 >> (0x00007fc04c9e1000) >> >> libXi.so.6 => /usr/lib/x86_64-linux-gnu/libXi.so.6 (0x00007fc04c7d1000) >> libXrandr.so.2 => /usr/lib/x86_64-linux-gnu/libXrandr.so.2 >> (0x00007fc04c5c7000) >> >> libXss.so.1 => /usr/lib/x86_64-linux-gnu/libXss.so.1 >> (0x00007fc04c3c2000) >> libXxf86vm.so.1 => /usr/lib/x86_64-linux-gnu/libXxf86vm.so.1 >> (0x00007fc04c1bc000) >> >> librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fc04bfb4000) >> libpulsecommon-4.0.so => >> /usr/lib/x86_64-linux-gnu/pulseaudio/libpulsecommon-4.0.so >> (0x00007fc04bd4c000) >> >> >> >> libjson-c.so.2 => /lib/x86_64-linux-gnu/libjson-c.so.2 >> (0x00007fc04bb42000) >> libdbus-1.so.3 => /lib/x86_64-linux-gnu/libdbus-1.so.3 >> (0x00007fc04b8fc000) >> >> libxcb.so.1 => /usr/lib/x86_64-linux-gnu/libxcb.so.1 >> (0x00007fc04b6de000) >> libXrender.so.1 => /usr/lib/x86_64-linux-gnu/libXrender.so.1 >> (0x00007fc04b4d4000) >> >> libXfixes.so.3 => /usr/lib/x86_64-linux-gnu/libXfixes.so.3 >> (0x00007fc04b2cd000) >> libwrap.so.0 => /lib/x86_64-linux-gnu/libwrap.so.0 (0x00007fc04b0c3000) >> >> libsndfile.so.1 => /usr/lib/x86_64-linux-gnu/libsndfile.so.1 >> (0x00007fc04ae5a000) >> libasyncns.so.0 => /usr/lib/x86_64-linux-gnu/libasyncns.so.0 >> (0x00007fc04ac54000) >> >> libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 >> (0x00007fc04aa50000) >> libXdmcp.so.6 => /usr/lib/x86_64-linux-gnu/libXdmcp.so.6 >> (0x00007fc04a849000) >> >> libnsl.so.1 => /lib/x86_64-linux-gnu/libnsl.so.1 (0x00007fc04a62f000) >> libFLAC.so.8 => /usr/lib/x86_64-linux-gnu/libFLAC.so.8 >> (0x00007fc04a3fe000) >> >> libvorbisenc.so.2 => /usr/lib/x86_64-linux-gnu/libvorbisenc.so.2 >> (0x00007fc049f2e000) >> libvorbis.so.0 => /usr/lib/x86_64-linux-gnu/libvorbis.so.0 >> (0x00007fc049d01000) >> >> libogg.so.0 => /usr/lib/x86_64-linux-gnu/libogg.so.0 >> (0x00007fc049af8000) >> libresolv.so.2 => /lib/x86_64-linux-gnu/libresolv.so.2 >> (0x00007fc0498dd000) >> >> >> # libav is not on this list because libgroove depends statically upon it >> >> >> >> here's the difference in linker steps for libgroove.so between the working >> manual build and the not-working PPA build: >> >> # ppa link step (broken): >> >> /usr/bin/cc -fPIC -g -O2 -fstack-protector --param=ssp-buffer-size=4 >> -Wformat -Werror=format-security -D_FORTIFY_SOURCE=2 -O2 -g -DNDEBUG >> -Wl,-Bsymbolic -Wl,-z,relro -shared -Wl,-soname,libgroove.so.2 -o >> libgroove.so.2.0.2 CMakeFiles/groove.dir/src/queue.c.o >> CMakeFiles/groove.dir/src/loudness_detector.c.o >> CMakeFiles/groove.dir/src/buffer.c.o CMakeFiles/groove.dir/src/encoder.c.o >> CMakeFiles/groove.dir/src/file.c.o CMakeFiles/groove.dir/src/playlist.c.o >> CMakeFiles/groove.dir/src/global.c.o CMakeFiles/groove.dir/src/player.c.o >> deps/libav/install/lib/libavfilter.a deps/libav/install/lib/libavformat.a >> deps/libav/install/lib/libavcodec.a deps/libav/install/lib/libavresample.a >> deps/libav/install/lib/libswscale.a deps/libav/install/lib/libavutil.a -lbz2 >> -lz -lmp3lame -lpthread -Wl,-Bstatic -lSDL2main -Wl,-Bdynamic -lSDL2 >> -lpthread -Wl,-Bstatic -lebur128 -lSDL2main -Wl,-Bdynamic -lSDL2 >> -Wl,-Bstatic -lebur128 -Wl,-Bdynamic >> >> >> >> >> # see full build log: >> https://launchpadlibrarian.net/156927161/buildlog_ubuntu-saucy-amd64.libgroove_2.0.2-2_UPLOADING.txt.gz >> >> >> >> >> >> # build manually from source link step (works): >> >> >> /usr/bin/cc -fPIC -Wl,-Bsymbolic -shared -Wl,-soname,libgroove.so.2 -o >> libgroove.so.2.0.0 CMakeFiles/groove.dir/src/global.c.o >> CMakeFiles/groove.dir/src/loudness_detector.c.o >> CMakeFiles/groove.dir/src/playlist.c.o CMakeFiles/groove.dir/src/buffer.c.o >> CMakeFiles/groove.dir/src/encoder.c.o CMakeFiles/groove.dir/src/queue.c.o >> CMakeFiles/groove.dir/src/file.c.o CMakeFiles/groove.dir/src/player.c.o >> deps/libav/install/lib/libavfilter.a deps/libav/install/lib/libavformat.a >> deps/libav/install/lib/libavcodec.a deps/libav/install/lib/libavresample.a >> deps/libav/install/lib/libswscale.a deps/libav/install/lib/libavutil.a -lbz2 >> -lz -lmp3lame -lpthread -Wl,-Bstatic -lSDL2main -Wl,-Bdynamic -lSDL2 >> -lpthread deps/ebur128/libebur128.a -Wl,-Bstatic -lSDL2main -Wl,-Bdynamic >> -lSDL2 >> >> >> >> >> _______________________________________________ >> Mailing list: https://launchpad.net/~launchpad-users >> Post to : launchpad-users@lists.launchpad.net >> 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