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diff --git mfbt/Alignment.h mfbt/Alignment.h
index e0843ca..353ec36 100644
--- mozilla/mfbt/Alignment.h
+++ mozilla/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 @@ public:
};
#define MOZ_ALIGNOF(T) mozilla::AlignmentFinder<T>::alignment
+#endif
/*
* Declare the MOZ_ALIGNED_DECL macro for declaring aligned types.
@@ -43,7 +53,10 @@ public:
* 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)
diff --git mfbt/Attributes.h mfbt/Attributes.h
index d317766..ddb13da 100644
--- mozilla/mfbt/Attributes.h
+++ mozilla/mfbt/Attributes.h
@@ -50,6 +50,7 @@
* don't indicate support for them here, due to
* http://stackoverflow.com/questions/20498142/visual-studio-2013-explicit-keyword-bug
*/
+# define MOZ_HAVE_CXX11_ALIGNAS
# define MOZ_HAVE_NEVER_INLINE __declspec(noinline)
# define MOZ_HAVE_NORETURN __declspec(noreturn)
# ifdef __clang__
@@ -70,6 +71,9 @@
# ifndef __has_extension
# define __has_extension __has_feature /* compatibility, for older versions of clang */
# endif
+# if __has_extension(cxx_alignas)
+# define MOZ_HAVE_CXX11_ALIGNAS
+# endif
# if __has_extension(cxx_constexpr)
# define MOZ_HAVE_CXX11_CONSTEXPR
# endif
@@ -84,6 +88,9 @@
# endif
#elif defined(__GNUC__)
# if defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L
+# if MOZ_GCC_VERSION_AT_LEAST(4, 8, 0)
+# define MOZ_HAVE_CXX11_ALIGNAS
+# endif
# define MOZ_HAVE_CXX11_CONSTEXPR
# define MOZ_HAVE_EXPLICIT_CONVERSION
# endif
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