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ARM: explicitly specify the 8-byte alignment

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It seems that GCC interprets `__attribute__((__aligned__))` as 8-byte
alignment on ARM, but clang does not.  Explicitly specify the
double-word alignment value to ensure that the structure is properly
aligned.

llvm-svn: 311574
This commit is contained in:
Saleem Abdulrasool 2017-08-23 16:50:27 +00:00
parent 853a8d9ffc
commit f8774f1d73
2 changed files with 11 additions and 3 deletions
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2
libunwind/include/unwind.h
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@ -100,7 +100,7 @@ struct _Unwind_Control_Block {
} pr_cache;
long long int :0; /* Enforce the 8-byte alignment */
} __attribute__((__aligned__));
} __attribute__((__aligned__(8)));
typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
(_Unwind_State state,

12
libunwind/test/alignment.pass.cpp
View File

@ -13,8 +13,16 @@
#include <unwind.h>
struct MaxAligned {} __attribute__((aligned));
static_assert(alignof(_Unwind_Exception) == alignof(MaxAligned), "");
// EHABI : 8-byte aligned
// itanium: largest supported alignment for the system
#if defined(_LIBUNWIND_ARM_EHABI)
static_assert(alignof(_Unwind_Control_Block) == 8,
"_Unwind_Control_Block must be double-word aligned");
#else
struct MaxAligned {} __attribute__((__aligned__));
static_assert(alignof(_Unwind_Exception) == alignof(MaxAligned),
"_Unwind_Exception must be maximally aligned");
#endif
int main()
{