Merging r342815:
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r342815 | ericwf | 2018-09-22 12:22:36 -0700 (Sat, 22 Sep 2018) | 14 lines
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.
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git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/branches/release_70@344917 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/fallback_malloc.cpp b/src/fallback_malloc.cpp
index 336ad31..bec9952 100644
--- a/src/fallback_malloc.cpp
+++ b/src/fallback_malloc.cpp
@@ -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>
