if test -n "${cc_is_clang}"

then

# bpo-36618: 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 added to CFLAGS and not just CFLAGS_NODIST,

# since third party C extensions can have the same issue.

#

# Check if -fmax-type-align flag is supported (it's not supported by old

# clang versions):

if "$CC" -v --help 2>/dev/null |grep -- -fmax-type-align > /dev/null; then

CFLAGS="$CFLAGS -fmax-type-align=8"

fi

fi