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test_ctypes: test_generated_data() fails on x86 Debian Installed with X 3.x #121938
Description
Bug report
x86 Debian Installed with X 3.x build: https://buildbot.python.org/all/#/builders/1244/builds/2499
FAIL: test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (name='Packed4')
Check that a ctypes struct/union matches its C equivalent.
----------------------------------------------------------------------
Traceback (most recent call last):
File "/buildbot/buildarea/3.x.ware-debian-x86.installed/build/target/lib/python3.14/test/test_ctypes/test_generated_structs.py", line 444, in test_generated_data
self.assertEqual(sizeof(cls), next(expected))
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: 12 != 16
The structure:
@register()
class Packed4(Structure):
_fields_ = [('a', c_int8), ('b', c_int64)]
_pack_ = 8configure:
./configure --prefix '$(PWD)/target'
test.pythoninfo:
CC.version: gcc (Debian 12.2.0-14) 12.2.0
sysconfig[CFLAGS]: -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O3 -Wall
sysconfig[PY_CFLAGS]: -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O3 -Wall
sysconfig[PY_CFLAGS_NODIST]: -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden -I./Include/internal -I./Include/internal/mimalloc
sysconfig[PY_STDMODULE_CFLAGS]: -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O3 -Wall -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden -I./Include/internal -I./Include/internal/mimalloc -I. -I./Include
Activity
vstinner commentedon Aug 5, 2024
cc @zware
zware commentedon Aug 5, 2024
According to
git bisect, this is due to 18c1a8dvstinner commentedon Aug 6, 2024
cc @gpshead @encukou who authored the change introducing the regression.
hroncok commentedon Oct 16, 2024
We see this on Fedora i686 as well.
mcepl commentedon Oct 17, 2024
Yes, the same on openSUSE with 3.14.0~a1. Works on x86_64, but breaks on 32bit i586.
Complete build log.
encukou commentedon Oct 18, 2024
I'll fix it by alpha 2
pythongh-121938: ctypes: Skip test of _pack_-ed struct with c_int64 o…
encukou commentedon Oct 23, 2024
Took a while, but I'm now convinced that skipping this test is the correct thing to do.
The test code to generate an C struct equivalent to a
ctypesstruct is far from perfect.gh-121938: ctypes: Skip test of _pack_-ed struct with c_int64 on x86 (G…
pythongh-121938: ctypes: Skip test of _pack_-ed struct with c_int64 o…