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-rw-r--r--include/sys/cdefs.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/sys/cdefs.h b/include/sys/cdefs.h
index 4acb72b70..877746e47 100644
--- a/include/sys/cdefs.h
+++ b/include/sys/cdefs.h
@@ -28,4 +28,17 @@
#define __CONSTVALUE
#define __CONSTVALUE2
+#ifdef __GNUC__
+/* GCC can always grok prototypes. For C++ programs we add throw()
+ to help it optimize the function calls. But this works only with
+ gcc 2.8.x and egcs. */
+#if defined __cplusplus && __GNUC_PREREQ (2,8)
+#define __THROW throw()
+#else
+#define __THROW
+#endif
+#else /* GCC */
+#define __THROW
+#endif
+
#endif