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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"3.15.0a2 doesn't compile with `CFLAGS=-DNDEBUG` and `--with-pydebug`","articleBody":"# Bug report\n\n### Bug description:\n\nWhen configured using `./configure --with-pydebug` (and explicitly not using `--with-assertions`), the build fails with:\n\n```\n+ make -j2 -C build-shared EXTRA_CFLAGS= LIBRARY=libpython3.15t-pic.a libpython3.15t-pic.a\nmake: Entering directory '/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/build-shared'\nx86_64-conda-linux-gnu-gcc -pthread -c -fno-strict-overflow -Wsign-compare -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g -Og -Wall -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O0 -ffunction-sections -pipe -isystem /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work=/usr/local/src/conda/python-3.15.0a2 -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol=/usr/local/src/conda-prefix -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O0 -ffunction-sections -pipe -isystem /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work=/usr/local/src/conda/python-3.15.0a2 -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol=/usr/local/src/conda-prefix  -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal -I/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal/mimalloc -IObjects -IInclude -IPython -I. -I/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include -DNDEBUG -D_FORTIFY_SOURCE=2 -O0 -isystem /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -I/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -DNDEBUG -D_FORTIFY_SOURCE=2 -O0 -isystem /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -I/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -fPIC -DPy_BUILD_CORE -o Objects/typeobject.o /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Objects/typeobject.c\nx86_64-conda-linux-gnu-gcc -pthread -c -fno-strict-overflow -Wsign-compare -fno-omit-frame-pointer -mno-omit-leaf-frame-pointer -g -Og -Wall -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O0 -ffunction-sections -pipe -isystem /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work=/usr/local/src/conda/python-3.15.0a2 -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol=/usr/local/src/conda-prefix -march=nocona -mtune=haswell -ftree-vectorize -fPIC -fstack-protector-strong -fno-plt -O0 -ffunction-sections -pipe -isystem /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work=/usr/local/src/conda/python-3.15.0a2 -fdebug-prefix-map=/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol=/usr/local/src/conda-prefix  -std=c11 -Wextra -Wno-unused-parameter -Wno-missing-field-initializers -Wstrict-prototypes -Werror=implicit-function-declaration -fvisibility=hidden  -I/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal -I/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal/mimalloc -IObjects -IInclude -IPython -I. -I/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include -DNDEBUG -D_FORTIFY_SOURCE=2 -O0 -isystem /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -I/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -DNDEBUG -D_FORTIFY_SOURCE=2 -O0 -isystem /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -I/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_h_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/include -fPIC -DPy_BUILD_CORE -o Objects/unicode_format.o /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Objects/unicode_format.c\nIn file included from /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_build_env/x86_64-conda-linux-gnu/sysroot/usr/include/assert.h:36,\n                 from /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/Python.h:20,\n                 from /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Objects/unicode_format.c:43:\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_build_env/x86_64-conda-linux-gnu/sysroot/usr/include/features.h:330:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]\n  330 | #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)\n      |    ^~~~~~~\nIn file included from /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_build_env/x86_64-conda-linux-gnu/sysroot/usr/include/assert.h:36,\n                 from /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/Python.h:20,\n                 from /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Objects/typeobject.c:3:\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/_build_env/x86_64-conda-linux-gnu/sysroot/usr/include/features.h:330:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]\n  330 | #  warning _FORTIFY_SOURCE requires compiling with optimization (-O)\n      |    ^~~~~~~\nIn file included from /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal/pycore_weakref.h:11,\n                 from /home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Objects/typeobject.c:24:\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal/pycore_critical_section.h: In function '_PyCriticalSection_AssertHeld':\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal/pycore_critical_section.h:221:29: warning: unused variable 'cs' [-Wunused-variable]\n  221 |         PyCriticalSection2 *cs = (PyCriticalSection2 *)(prev \u0026 ~_Py_CRITICAL_SECTION_MASK);\n      |                             ^~\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal/pycore_critical_section.h:225:28: warning: unused variable 'cs' [-Wunused-variable]\n  225 |         PyCriticalSection *cs = (PyCriticalSection *)(tstate-\u003ecritical_section \u0026 ~_Py_CRITICAL_SECTION_MASK);\n      |                            ^~\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal/pycore_critical_section.h: In function '_PyCriticalSection_AssertHeldObj':\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal/pycore_critical_section.h:240:29: warning: unused variable 'cs' [-Wunused-variable]\n  240 |         PyCriticalSection2 *cs = (PyCriticalSection2 *)(prev \u0026 ~_Py_CRITICAL_SECTION_MASK);\n      |                             ^~\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal/pycore_critical_section.h:246:28: warning: unused variable 'cs' [-Wunused-variable]\n  246 |         PyCriticalSection *cs = (PyCriticalSection *)(prev \u0026 ~_Py_CRITICAL_SECTION_MASK);\n      |                            ^~\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Include/internal/pycore_critical_section.h:236:14: warning: unused variable 'mutex' [-Wunused-variable]\n  236 |     PyMutex *mutex = \u0026_PyObject_CAST(op)-\u003eob_mutex;\n      |              ^~~~~\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Objects/typeobject.c: In function 'set_tp_bases':\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Objects/typeobject.c:106:10: error: implicit declaration of function 'types_world_is_stopped' [-Wimplicit-function-declaration]\n  106 |     if (!types_world_is_stopped()) { _Py_CRITICAL_SECTION_ASSERT_MUTEX_LOCKED(TYPE_LOCK); }\n      |          ^~~~~~~~~~~~~~~~~~~~~~\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Objects/typeobject.c:113:33: note: in expansion of macro 'ASSERT_TYPE_LOCK_HELD'\n  113 |     if (TYPE_IS_REVEALED(tp)) { ASSERT_TYPE_LOCK_HELD(); }\n      |                                 ^~~~~~~~~~~~~~~~~~~~~\n/home/conda/feedstock_root/build_artifacts/python-split_1764324859162/work/Objects/typeobject.c:604:5: note: in expansion of macro 'ASSERT_NEW_TYPE_OR_LOCKED'\n  604 |     ASSERT_NEW_TYPE_OR_LOCKED(self);\n      |     ^~~~~~~~~~~~~~~~~~~~~~~~~\n```\n\nThis was introduced in #140133 which tried to fix #133177\n\n\n### CPython versions tested on:\n\n3.15\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-142039\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/xhochy","@type":"Person","name":"xhochy"},"datePublished":"2025-11-28T14:19:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/142038/cpython/issues/142038"}