New submission from Matthias Klose <d...@debian.org>:

regression compared to 3.8:

$ python3.9
Python 3.9.1rc1 (default, Nov 27 2020, 19:38:39) 
[GCC 10.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> ctypes.util.find_library("libc")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'ctypes' is not defined
>>> import ctypes.util
>>> ctypes.util.find_library("libc")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.9/ctypes/util.py", line 341, in find_library
    _get_soname(_findLib_gcc(name)) or _get_soname(_findLib_ld(name))
  File "/usr/lib/python3.9/ctypes/util.py", line 147, in _findLib_gcc
    if not _is_elf(file):
  File "/usr/lib/python3.9/ctypes/util.py", line 99, in _is_elf
    with open(filename, 'br') as thefile:
FileNotFoundError: [Errno 2] No such file or directory: b'liblibc.a'

also note that the shared library is installed.

----------
components: ctypes
keywords: 3.9regression
messages: 382592
nosy: doko
priority: normal
severity: normal
status: open
title: ctypes.util.find_library("libc") fails
versions: Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42580>
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