Static library not included in resulting LLVM executable
I am trying to compile a c program using LLVM and I am having trouble getting some static libraries included. I have successfully compiled those static libraries using LLVM and, for example, libogg.a is present, as is ogg.l.bc.
However, when I try to build the final program, it does not include the static ogg library. I've tried various compiler options with the most notable being:
gcc oggvorbis.c -O3 -Wall -I$OV_DIR/include -l$OV_DIR/lib/libogg.a -l$OV_DIR/lib/libvorbis.a -o test.exe
This results in the following output (directories shortened for brevity):
$OV_DIR/include/vorbis/vorbisfile.h:75: warning: ‘OV_CALLBACKS_DEFAULT’ defined but not used
$OV_DIR/include/vorbis/vorbisfile.h:82: warning: ‘OV_CALLBACKS_NOCLOSE’ defined but not used
$OV_DIR/include/vorbis/vorbisfile.h:89: warning: ‘OV_CALLBACKS_STREAMONLY’ defined but not used
$OV_DIR/include/vorbis/vorbisfile.h:96: warning: ‘OV_CALLBACKS_STREAMONLY_NOCLOSE’ defined but not used
llvm-ld: warning: Cannot find library '$OV_DIR/lib/ogg.l.bc'
ll开发者_如何学编程vm-ld: warning: Cannot find library '$OV_DIR/lib/vorbis.l.bc'
WARNING: While resolving call to function 'main' arguments were dropped!
I find this perplexing because $OV_DIR/lib/ogg.l.bc DOES exist, as does vorbis.l.bc and they are both readable (as are their containing directories) by everyone.
Does anyone have any idea with what I am doing wrong?
Thanks,
Matt
As unwind said, -l is followed by the library name.
For example, in linux library naming conventions, if a library is named libogg,
-logg will find and choose the *best match in the library directories.
You can add a directory into the list:
- -L option is one of the way to add the following folder to the list temporarily.
- The environment variable LD_LIBRARY_PATH also affects the list on most of Linux/Unix > with GNU tools.
gcc may find both static and shared library files whose name matches with the requested library name.
For example,
libogg.a libogg.so
That's why there is a gcc option, -static
-static
On systems that support dynamic linking, this prevents linking with the shared libraries. On other systems, this option has no effect.
If you just want to use a shared or static library file - directly, just as an object file, then give their path without any option, like
gcc oggvorbis.c the_path/libogg.a
I don't think the -l
option expects paths. You should split those out, and use the -L
option to set the paths, then just use plain library names with -l
:
$ gcc oggvorbis.c -O3 -Wall -I$OV_DIR/include -L$OV_DIR/lib -logg -lvorbis -o test.exe
Also note that when used like this, you don't include the "lib" and ".a" parts of the library name.
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