Mojo C bindings library pt1: MojomBuffer

mojo/public/c/system/macros.h

Index: mojo/public/c/system/macros.h
diff --git a/mojo/public/c/system/macros.h b/mojo/public/c/system/macros.h
index 7c7aa2c3f34f169639b1186e82a273fa9a3526d2..b8dbb1d1cf56374262afe8303ac3c1636a1ba5fd 100644
--- a/mojo/public/c/system/macros.h
+++ b/mojo/public/c/system/macros.h
@@ -24,13 +24,12 @@
 #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.