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bpo-36618: Don't add -fmax-type-align flag to old clang #12811

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Merged
vstinner merged 1 commit into from
Apr 12, 2019
Merged

bpo-36618: Don't add -fmax-type-align flag to old clang #12811

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4 changes: 2 additions & 2 deletions Misc/NEWS.d/next/Build/2019-04-12-19-49-10.bpo-36618.gcI9iq.rst
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Expand Up @@ -4,5 +4,5 @@ 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.
must be added to ``CFLAGS`` and not just ``CFLAGS_NODIST``, since third party C
extensions can have the same issue.
9 changes: 7 additions & 2 deletions configure
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Expand Up @@ -6889,9 +6889,14 @@ then
# 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,
# Sadly, the flag must be added to CFLAGS and not just CFLAGS_NODIST,
# since third party C extensions can have the same issue.
CFLAGS="$CFLAGS -fmax-type-align=8"
#
# Check if -fmax-type-align flag is supported (it's not supported by old
# clang versions):
if "$CC" -v --help 2>/dev/null |grep -- -fmax-type-align > /dev/null; then
CFLAGS="$CFLAGS -fmax-type-align=8"
fi
fi


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9 changes: 7 additions & 2 deletions configure.ac
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Expand Up @@ -1540,9 +1540,14 @@ then
# 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,
# Sadly, the flag must be added to CFLAGS and not just CFLAGS_NODIST,
# since third party C extensions can have the same issue.
CFLAGS="$CFLAGS -fmax-type-align=8"
#
# Check if -fmax-type-align flag is supported (it's not supported by old
# clang versions):
if "$CC" -v --help 2>/dev/null |grep -- -fmax-type-align > /dev/null; then
CFLAGS="$CFLAGS -fmax-type-align=8"
fi
fi

AC_SUBST(BASECFLAGS)
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