[issue42164] Python fails to compile in the Fedora Stable LTO buildbots

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

With LTO, compile.o requires an undefined _Py_Mangle symbol:

$ gcc -pthread -c -DNDEBUG -fwrapv -O3 -std=c99 -fvisibility=hidden -flto -I./Include/internal  -I. -I./Include -DPy_BUILD_CORE -o Python/compile.o Python/compile.c; nm Python/compile.o | grep _Py_Mangle

         U _Py_Mangle


Without LTO, compile.o defines _Py_Mangle symbol:

$ gcc -pthread -c -DNDEBUG -fwrapv -O3 -std=c99 -fvisibility=hidden -I./Include/internal  -I. -I./Include -DPy_BUILD_CORE -o Python/compile.o Python/compile.c; nm Python/compile.o | grep _Py_Mangle

0000000000003c20 T _Py_Mangle

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<https://bugs.python.org/issue42164>
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