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authorBernhard Reutner-Fischer2006-01-22 22:55:11 +0000
committerBernhard Reutner-Fischer2006-01-22 22:55:11 +0000
commit86f5c9906beac527f3d7966f24811b571a589e08 (patch)
tree1c9eba853c728b5d734506e1c66c269d96fe46ea /include/platform.h
parent2edf52643d3eb3d13f26d31f9678cf122f2063bc (diff)
downloadbusybox-86f5c9906beac527f3d7966f24811b571a589e08.zip
busybox-86f5c9906beac527f3d7966f24811b571a589e08.tar.gz
- add platform.h.
- use shorter boilerplate while at it.
Diffstat (limited to 'include/platform.h')
-rw-r--r--include/platform.h82
1 files changed, 82 insertions, 0 deletions
diff --git a/include/platform.h b/include/platform.h
new file mode 100644
index 0000000..763292d
--- /dev/null
+++ b/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 */