- add platform.h.

- use shorter boilerplate while at it.

include/platform.h

@@ -0,0 +1,82 @@
+/*
+   Copyright 2006, Bernhard Fischer
+
+   Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+*/
+#ifndef	__PLATFORM_H
+#define __PLATFORM_H	1
+
+/* Convenience macros to test the version of gcc. */
+#undef __GNUC_PREREQ
+#if defined __GNUC__ && defined __GNUC_MINOR__
+# define __GNUC_PREREQ(maj, min) \
+	        ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+#else
+# define __GNUC_PREREQ(maj, min) 0
+#endif
+
+/* __restrict is known in EGCS 1.2 and above. */
+#if !__GNUC_PREREQ (2,92)
+# ifndef __restrict
+#  define __restrict     /* Ignore */
+# endif
+#endif
+
+/* Define macros for some gcc attributes.  This permits us to use the
+   macros freely, and know that they will come into play for the
+   version of gcc in which they are supported.  */
+
+#if !__GNUC_PREREQ (2,7)
+# ifndef __attribute__
+#  define __attribute__(x)
+# endif
+#endif
+
+#if 0
+/* Attribute __malloc__ on functions was valid as of gcc 2.96. */
+#ifndef ATTRIBUTE_MALLOC
+# if __GNUC_PREREQ (2,96)
+#  define ATTRIBUTE_MALLOC __attribute__ ((__malloc__))
+# else
+#  define ATTRIBUTE_MALLOC
+# endif /* GNUC >= 2.96 */
+#endif /* ATTRIBUTE_MALLOC */
+#endif
+
+#ifndef ATTRIBUTE_UNUSED
+#define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+#endif /* ATTRIBUTE_UNUSED */
+
+#ifndef ATTRIBUTE_NORETURN
+#define ATTRIBUTE_NORETURN __attribute__ ((__noreturn__))
+#endif /* ATTRIBUTE_NORETURN */
+
+#ifndef ATTRIBUTE_PACKED
+#define ATTRIBUTE_PACKED __attribute__ ((__packed__))
+#endif /* ATTRIBUTE_NORETURN */
+
+/* -fwhole-program makes all symbols local. The attribute externally_visible
+   forces a symbol global.  */
+#ifndef ATTRIBUTE_EXTERNALLY_VISIBLE
+# if __GNUC_PREREQ (4,1)
+# define ATTRIBUTE_EXTERNALLY_VISIBLE __attribute__ ((__externally_visible__))
+# else
+# define ATTRIBUTE_EXTERNALLY_VISIBLE
+# endif /* GNUC >= 4.1 */
+#endif /* ATTRIBUTE_EXTERNALLY_VISIBLE */
+
+/* We use __extension__ in some places to suppress -pedantic warnings
+   about GCC extensions.  This feature didn't work properly before
+   gcc 2.8.  */
+#if !__GNUC_PREREQ (2,8)
+# ifndef __extension__
+#  define __extension__
+# endif
+#endif
+
+
+/* include USAGE_APPLET_x helper macros for usage.h.  */
+/*
+#include "_usage.h"
+*/
+#endif	/* platform.h	*/