Make PPAPI headers compile with C compilers (gcc on Linux & Mac and MSVS on W...

ppapi/c/pp_macros.h

+// Copyright (c) 2010 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 PPAPI_C_PP_MACROS_H_
+#define PPAPI_C_PP_MACROS_H_
+
+/**
+ * @file
+ * Defines the API ...
+ *
+ * @addtogroup PP
+ * @{
+ */
+
+/* Use PP_INLINE to tell the compiler to inline functions.  The main purpose of
+ * inline functions in ppapi is to allow us to define convenience functions in
+ * the ppapi header files, without requiring clients or implementers to link a
+ * PPAPI C library.  The "inline" keyword is not supported by pre-C99 C
+ * compilers (such as MS Visual Studio 2008 and older versions of GCC).  MSVS
+ * supports __forceinline and GCC supports __inline__.  Use of the static
+ * keyword ensures (in C) that the function is not compiled on its own, which
+ * could cause multiple definition errors.
+ *  http://msdn.microsoft.com/en-us/library/z8y1yy88.aspx
+ *  http://gcc.gnu.org/onlinedocs/gcc/Inline.html
+ */
+#if defined(__cplusplus)
+/* The inline keyword is part of C++ and guarantees we won't get multiple
+ * definition errors.
+ */
+# define PP_INLINE inline
+#else
+# if defined(_MSC_VER)
+#  define PP_INLINE static __forceinline
+# else
+#  define PP_INLINE static __inline__
+# endif
+#endif
+
+/**
+ * @}
+ * End of addtogroup PP
+ */
+
+#endif  // PPAPI_C_PP_MACROS_H_
+