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authorVictor Stinner <vstinner@redhat.com>2019-04-12 19:27:37 (GMT)
committerGitHub <noreply@github.com>2019-04-12 19:27:37 (GMT)
commit23a683adf803eef405d248cc9c2a7eb08a7300e2 (patch)
tree6e2c3cfbe541c098b51418c092bc8e61a20937ab /Include/funcobject.h
parent606c66a17faf34a4e74d4829e8fe5ad0d2879434 (diff)
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bpo-36618: Add -fmax-type-align=8 flag for clang (GH-12809)
Add -fmax-type-align=8 to CFLAGS when clang compiler is detected. The pymalloc memory allocator aligns memory on 8 bytes. On x86-64, clang expects alignment on 16 bytes by default and so uses MOVAPS instruction which can lead to segmentation fault. Instruct clang that Python is limited to alignemnt on 8 bytes to use MOVUPS instruction instead: slower but don't trigger a SIGSEGV if the memory is not aligned on 16 bytes. Sadly, the flag must be expected to CFLAGS and not just CFLAGS_NODIST, since third party C extensions can have the same issue.
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