[ctypes][linux] ctypes.util.find_library() crash instead of return None #114257
Description
Bug report
Bug description:
The problem:
ctypes.util.find_library() raises an exception on certain inputs when it cannot find it.
Expected behavior:
No exception, return None as advertised if it cannot find the library.
Reproducer:
# on python 3.10, but same deal on other versions too >>> import ctypes.util >>> ctypes.util.find_library('libgomp') Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/path/to/lib/python3.10/ctypes/util.py", line 351, in find_library _get_soname(_findLib_gcc(name)) or _get_soname(_findLib_ld(name)) File "/path/to/lib/python3.10/ctypes/util.py", line 148, in _findLib_gcc if not _is_elf(file): File "/path/to/lib/python3.10/ctypes/util.py", line 100, in _is_elf with open(filename, 'br') as thefile: FileNotFoundError: [Errno 2] No such file or directory: b'liblibgomp.a'Note that the crash does not occur if you put nonsense in:
find_library('asdadsas')-> OKfind_library('libasdasdasd')-> OK
The problem appears to be a bit more contrived. Python is attempting to parse the output from gcc, which in this case is:
/usr/lib/gcc/x86_64-linux-gnu/12/../../../x86_64-linux-gnu/Scrt1.o /usr/lib/gcc/x86_64-linux-gnu/12/../../../x86_64-linux-gnu/crti.o /usr/lib/gcc/x86_64-linux-gnu/12/crtbeginS.o /usr/bin/ld: cannot find -llibgomp: No such file or directory /usr/bin/ld: note to link with /usr/lib/gcc/x86_64-linux-gnu/12/libgomp.a use -l:libgomp.a or rename it to liblibgomp.a /usr/lib/gcc/x86_64-linux-gnu/12/libgcc.a /usr/lib/gcc/x86_64-linux-gnu/12/libgcc_s.so /usr/lib/gcc/x86_64-linux-gnu/12/../../../x86_64-linux-gnu/libgcc_s.so.1 /usr/lib/gcc/x86_64-linux-gnu/12/libgcc.a collect2: error: ld returned 1 exit status But then the parser is getting confused trying to parse the useful diagnostic message mentioning libgomp.a.
Machine details (from platform.uname())
uname_result(system='Linux', node='iblis', release='6.5.0-14-generic', version='#14~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Mon Nov 20 18:15:30 UTC 2', machine='x86_64') CPython versions tested on:
3.10, 3.11, 3.12
Operating systems tested on:
Linux