GeezerVison is showing github.com — `v3.13.1` test `test_ctypes/test_dlerror.py` fails instead of skipping if `gcc` not in path · Issue #127626 · python/cpython
v3.13.1 test test_ctypes/test_dlerror.py fails instead of skipping if gcc not in path #127626
DescriptionBug report
Bug description:
The test use the follow logic to detect presence of gcc,
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retcode = subprocess.call(["gcc", "--version"], |
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stdout=subprocess.DEVNULL, |
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stderr=subprocess.DEVNULL) |
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if retcode != 0: |
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self.skipTest("gcc is missing") |
which appears to not recover gracefully if gcc is not in path, causing the test_ctypes test failing with the follow message:
1.356 test_signedness (test.test_ctypes.test_wintypes.WinTypesTest.test_signedness) ... ok
1.356 test_variant_bool (test.test_ctypes.test_wintypes.WinTypesTest.test_variant_bool) ... ok
1.356
1.356 ======================================================================
1.356 ERROR: test_null_dlsym (test.test_ctypes.test_dlerror.TestNullDlsym.test_null_dlsym)
1.356 ----------------------------------------------------------------------
1.356 Traceback (most recent call last):
1.356 File "/build/cpython/Lib/test/test_ctypes/test_dlerror.py", line 64, in test_null_dlsym
1.356 retcode = subprocess.call(["gcc", "--version"],
1.356 stdout=subprocess.DEVNULL,
1.356 stderr=subprocess.DEVNULL)
1.356 File "/build/cpython/Lib/subprocess.py", line 395, in call
1.356 with Popen(*popenargs, **kwargs) as p:
1.356 ~~~~~^^^^^^^^^^^^^^^^^^^^^^
1.356 File "/build/cpython/Lib/subprocess.py", line 1036, in __init__
1.356 self._execute_child(args, executable, preexec_fn, close_fds,
1.356 ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1.356 pass_fds, cwd, env,
1.356 ^^^^^^^^^^^^^^^^^^^
1.356 ...<5 lines>...
1.356 gid, gids, uid, umask,
1.356 ^^^^^^^^^^^^^^^^^^^^^^
1.356 start_new_session, process_group)
1.356 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1.356 File "/build/cpython/Lib/subprocess.py", line 1966, in _execute_child
1.356 raise child_exception_type(errno_num, err_msg, err_filename)
1.356 FileNotFoundError: [Errno 2] No such file or directory: 'gcc'
1.356
1.356 ----------------------------------------------------------------------
1.356 Ran 507 tests in 0.717s
1.356
1.356 FAILED (errors=1, skipped=33)
1.377 test test_ctypes failed
1.377 test_ctypes failed (1 error)
1.377
1.377 == Tests result: FAILURE ==
To reproduce the above test failure, this is a Linux Dockerfile with only clang installed as $CC but no gcc in path:
FROM debian:12-slim
RUN apt-get update
RUN apt-get install -y --no-install-recommends git ca-certificates
RUN apt-get install -y --no-install-recommends make
RUN apt-get install -y --no-install-recommends clang
RUN apt-get install -y --no-install-recommends libffi-dev
WORKDIR /build/
RUN git clone --depth 1 https://github.com/python/cpython --branch v3.13.1 /build/cpython
WORKDIR /build/cpython/
RUN ./configure && make
RUN ./python -m test -v test_ctypes
Looking around, I found the adjacent test_ctypes/test_find.py used try/except OSError to wrap a similar check, I believe it could be an alternative.
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try: |
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p = subprocess.Popen(['gcc', '--version'], stdout=subprocess.PIPE, |
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stderr=subprocess.DEVNULL) |
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out, _ = p.communicate() |
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except OSError: |
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raise unittest.SkipTest('gcc, needed for test, not available') |
CPython versions tested on:
3.13
Operating systems tested on:
Linux Activitypicnixz commented on Jun 14, 2025 Itm was fixed in #129872 (it was also reported separately):
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try: |
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retcode = subprocess.call(["gcc", "--version"], |
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stdout=subprocess.DEVNULL, |
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stderr=subprocess.DEVNULL) |
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except OSError: |
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self.skipTest("gcc is missing") |
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