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ARM Raspbian 3.x fails to build _testcapi extension: undefined symbol: __atomic_fetch_or_8 #109054

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@vstinner

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@vstinner

I supposed that the build error is related toModules/_testcapi/pyatomic.c andInclude/cpython/pyatomic.h.

"Raspbian is a free operating system based on Debian optimized for the Raspberry Pi hardware."

Buildbot worker says: "Raspberry Pi 4 B running Raspbian (Bullseye 11.x)."

test.pythoninfo:

  • CC.version: gcc (Raspbian 10.2.1-6+rpi1) 10.2.1 20210110
  • platform.architecture: 32bit ELF
  • platform.libc_ver: glibc 2.31
  • platform.platform: Linux-6.1.21-v8+-aarch64-with-glibc2.31
  • sysconfig[PY_CFLAGS]:-fno-strict-overflow -DNDEBUG -g -O3 -Wall -UNDEBUG
  • sysconfig[PY_CFLAGS_NODIST]:-std=c11 -Werror=implicit-function-declaration -fvisibility=hidden -I./Include/internal
  • sysconfig[PY_STDMODULE_CFLAGS]:-fno-strict-overflow -DNDEBUG -g -O3 -Wall -UNDEBUG -std=c11 -Werror=implicit-function-declaration -fvisibility=hidden -I./Include/internal -I. -I./Include

Logs:

gcc -pthread -shared      Modules/_testcapimodule.o Modules/_testcapi/vectorcall.o Modules/_testcapi/vectorcall_limited.o Modules/_testcapi/heaptype.o Modules/_testcapi/abstract.o Modules/_testcapi/unicode.o Modules/_testcapi/dict.o Modules/_testcapi/getargs.o Modules/_testcapi/datetime.o Modules/_testcapi/docstring.o Modules/_testcapi/mem.o Modules/_testcapi/watchers.o Modules/_testcapi/long.o Modules/_testcapi/float.o Modules/_testcapi/structmember.o Modules/_testcapi/exceptions.o Modules/_testcapi/code.o Modules/_testcapi/buffer.o Modules/_testcapi/pyatomic.o Modules/_testcapi/pyos.o Modules/_testcapi/immortal.o Modules/_testcapi/heaptype_relative.o Modules/_testcapi/gc.o   -o Modules/_testcapi.cpython-313-arm-linux-gnueabihf.so[ERROR] _testcapi failed to import: /var/lib/buildbot/workers/3.x.gps-raspbian.nondebug/build/build/lib.linux-aarch64-3.13/_testcapi.cpython-313-arm-linux-gnueabihf.so: undefined symbol: __atomic_fetch_or_8The necessary bits to build these optional modules were not found:_tkinter              _uuid                                    To find the necessary bits, look in configure.ac and config.log.Following modules built successfully but were removed because they could not be imported:_testcapi                                                      Checked 107 modules (31 built-in, 72 shared, 1 n/a on linux-aarch64, 0 disabled, 2 missing, 1 failed on import)

logs:https://buildbot.python.org/all/#/builders/424/builds/4849

cc@colesbury@gpshead

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