#ifndef FOLLY_PORTABILITY_H_
#define FOLLY_PORTABILITY_H_
+#include <cstddef>
+
#ifndef FOLLY_NO_CONFIG
#include <folly/folly-config.h>
#endif
#endif
#endif
-// MaxAlign: max_align_t isn't supported by gcc
-#ifdef __GNUC__
-struct MaxAlign { char c; } __attribute__((__aligned__));
-#else /* !__GNUC__ */
-# error Cannot define MaxAlign on this platform
-#endif
-
// compiler specific attribute translation
// msvc should come first, so if clang is in msvc mode it gets the right defines
#else
# error Cannot define FOLLY_ALIGNED on this platform
#endif
-#define FOLLY_ALIGNED_MAX FOLLY_ALIGNED(alignof(MaxAlign))
+#define FOLLY_ALIGNED_MAX FOLLY_ALIGNED(alignof(std::max_align_t))
// NOTE: this will only do checking in msvc with versions that support /analyze
#if _MSC_VER
#elif defined(_MSC_VER)
# define FOLLY_DEPRECATED(msg) __declspec(deprecated(msg))
#else
-# define FOLLY_DEPRECATED
+# define FOLLY_DEPRECATED(msg)
#endif
// noreturn
# endif
#endif
+#if defined(__GNUC__) && !defined(__APPLE__) && !__GNUC_PREREQ(4,9)
+// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56019
+// gcc 4.8.x incorrectly placed max_align_t in the root namespace
+// Alias it into std (where it's found in 4.9 and later)
+namespace std { typedef ::max_align_t max_align_t; }
+#endif
/* Define macro wrappers for C++11's "final" and "override" keywords, which
* are supported in gcc 4.7 but not gcc 4.6. */
namespace folly {
+inline void asm_volatile_memory() {
+#if defined(__clang__) || defined(__GNUC__)
+ asm volatile("" : : : "memory");
+#elif defined(_MSC_VER)
+ ::_ReadWriteBarrier();
+#endif
+}
+
inline void asm_volatile_pause() {
#if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
::_mm_pause();