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Fix incorrectly aligned exceptions in 32 bit builds. 

This patch fixes a bug where exceptions in 32 bit builds
would be incorrectly aligned because malloc only provides 8 byte aligned
memory where 16 byte alignment is needed.

This patch makes libc++abi correctly use posix_memalign when it's
available. This requires defining _LIBCPP_BUILDING_LIBRARY so that
libc++ only defines _LIBCPP_HAS_NO_ALIGNED_ALLOCATION when libc doesn't
support it and not when aligned new/delete are disable for other
reasons.

This bug somehow made it into the 7.0 release, making it a regression.
Therefore this patch should be included in the next dot release.

llvm-svn: 342815
This commit is contained in:
Eric Fiselier 2018-09-22 19:22:36 +00:00
parent 931d66cd22
commit 4b47cbccd4
1 changed files with 3 additions and 0 deletions
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3
libcxxabi/src/fallback_malloc.cpp
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@ -7,6 +7,9 @@
//
//===----------------------------------------------------------------------===//
// Define _LIBCPP_BUILDING_LIBRARY to ensure _LIBCPP_HAS_NO_ALIGNED_ALLOCATION
// is only defined when libc aligned allocation is not available.
#define _LIBCPP_BUILDING_LIBRARY
#include "fallback_malloc.h"
#include <__threading_support>