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$NetBSD: patch-mfbt_Alignment.h,v 1.1 2015/07/09 14:13:52 ryoon Exp $
Make MOZ_ALIGNOF() use gcc's builtin __alignof__.
From https://bugzilla.mozilla.org/show_bug.cgi?id=1026499
--- mfbt/Alignment.h.orig 2014-07-17 01:45:32.000000000 +0000
+++ mfbt/Alignment.h
@@ -9,11 +9,20 @@
#ifndef mozilla_Alignment_h
#define mozilla_Alignment_h
+#include "mozilla/Attributes.h"
+
#include <stddef.h>
#include <stdint.h>
namespace mozilla {
+#if defined(MOZ_HAVE_CXX11_ALIGNAS)
+#define MOZ_ALIGNOF(T) alignof(T)
+#elif defined(__GNUC__)
+#define MOZ_ALIGNOF(T) __alignof__(T)
+#elif defined(_MSC_VER)
+#define MOZ_ALIGNOF(T) __alignof(T)
+#else
/*
* This class, and the corresponding macro MOZ_ALIGNOF, figures out how many
* bytes of alignment a given type needs.
@@ -32,6 +41,7 @@ class AlignmentFinder
};
#define MOZ_ALIGNOF(T) mozilla::AlignmentFinder<T>::alignment
+#endif
/*
* Declare the MOZ_ALIGNED_DECL macro for declaring aligned types.
@@ -43,7 +53,10 @@ class AlignmentFinder
* will declare a two-character array |arr| aligned to 8 bytes.
*/
-#if defined(__GNUC__)
+#if defined(MOZ_HAVE_CXX11_ALIGNAS)
+# define MOZ_ALIGNED_DECL(_type, _align) \
+ alignas(_align) _type
+#elif defined(__GNUC__)
# define MOZ_ALIGNED_DECL(_type, _align) \
_type __attribute__((aligned(_align)))
#elif defined(_MSC_VER)
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