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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test_ctypes: test_generated_data() fails on x86 Debian Installed with X 3.x","articleBody":"# Bug report\n\nx86 Debian Installed with X 3.x build: https://buildbot.python.org/all/#/builders/1244/builds/2499\n\n```\nFAIL: test_generated_data (test.test_ctypes.test_generated_structs.GeneratedTest.test_generated_data) (name='Packed4')\nCheck that a ctypes struct/union matches its C equivalent.\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  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\n    self.assertEqual(sizeof(cls), next(expected))\n    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\nAssertionError: 12 != 16\n```\n\nThe structure:\n\n```py\n@register()\nclass Packed4(Structure):\n    _fields_ = [('a', c_int8), ('b', c_int64)]\n    _pack_ = 8\n```\n\nconfigure:\n\n```\n./configure --prefix '$(PWD)/target'\n```\n\ntest.pythoninfo:\n\n```\nCC.version: gcc (Debian 12.2.0-14) 12.2.0\n\nsysconfig[CFLAGS]: -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O3 -Wall\n\nsysconfig[PY_CFLAGS]: -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O3 -Wall\n\nsysconfig[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\n\nsysconfig[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\n```\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-125877\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2024-07-17T21:25:07.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/121938/cpython/issues/121938"}