Mojo C bindings library pt1: MojomBuffer

mojo/public/c/system/macros.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MOJO_PUBLIC_C_SYSTEM_MACROS_H_
 #define MOJO_PUBLIC_C_SYSTEM_MACROS_H_
 
 #include <stddef.h>
 
 // Annotate a variable indicating it's okay if it's unused.
 // Use like:
 //   int x = ...;
 //   MOJO_ALLOW_UNUSED_LOCAL(x);
 #define MOJO_ALLOW_UNUSED_LOCAL(x) false ? (void)x : (void)0
 
 // Annotate a function indicating that the caller must examine the return value.
 // Use like:
 //   int foo() MOJO_WARN_UNUSED_RESULT;
 // Note that it can only be used on the prototype, and not the definition.
 #if defined(__GNUC__)
 #define MOJO_WARN_UNUSED_RESULT __attribute__((warn_unused_result))
 #else
 #define MOJO_WARN_UNUSED_RESULT
 #endif
 
 // Assert things at compile time. (|msg| should be a valid identifier name.)
-// This macro is currently C++-only, but we want to use it in the C core.h.
 // Use like:
 //   MOJO_STATIC_ASSERT(sizeof(Foo) == 12, "Foo has invalid size");
 #if defined(__cplusplus)
 #define MOJO_STATIC_ASSERT(expr, msg) static_assert(expr, msg)
 #else
-#define MOJO_STATIC_ASSERT(expr, msg)
+#define MOJO_STATIC_ASSERT(expr, msg) _Static_assert(expr, msg)
 #endif
 
 // Like the C++11 |alignof| operator.
 #if defined(__cplusplus) && __cplusplus >= 201103L
 #define MOJO_ALIGNOF(type) alignof(type)
 #elif defined(__GNUC__)
 #define MOJO_ALIGNOF(type) __alignof__(type)
 #elif defined(_MSC_VER)
 // The use of |sizeof| is to work around a bug in MSVC 2010 (see
 // http://goo.gl/isH0C; supposedly fixed since then).
@@ skipping 37 matching lines @@
 // using |MOJO_RESTRICT| unless aliasing is explicitly allowed.
 #if defined(__GNUC__) || defined(_MSC_VER)
 // Use |__restrict|, since it works both in C++ and when compiling as C90
 // (|restrict| is only available in C99 and later, and never in C++).
 #define MOJO_RESTRICT __restrict
 #else
 #error "Please define MOJO_RESTRICT for your compiler."
 #endif
 
 #endif  // MOJO_PUBLIC_C_SYSTEM_MACROS_H_