launchpad-users team mailing list archive

[Frank Trampe <frank.trampe@xxxxxxxxx>]

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?

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 <superjoe30@xxxxxxxxx>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
>
>
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