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-rw-r--r--include/features.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/features.h b/include/features.h
index bc10510..de2b143 100644
--- a/include/features.h
+++ b/include/features.h
@@ -244,9 +244,23 @@
#define __GLIBC__ 2
#define __GLIBC_MINOR__ 2
+/* Convenience macros to test the versions of glibc and gcc.
+ Use them like this:
+ #if __GNUC_PREREQ (2,8)
+ ... code requiring gcc 2.8 or later ...
+ #endif
+ Note - they won't work for gcc1 or glibc1, since the _MINOR macros
+ were not defined then. */
+#define __GNUC_PREREQ(maj,min) (defined __GNUC__ && defined __GNUC_MINOR__ \
+ && ((__GNUC__ << 16) + __GNUC_MINOR__) >= ((maj<<16) + min))
+#define __GLIBC_PREREQ(maj,min) (defined __GLIBC__ && defined __GLIBC_MINOR__ \
+ && ((__GLIBC__ << 16) + __GLIBC_MINOR__) >= ((maj<<16) + min))
+
/* This is here only because every header file already includes this one. */
#ifndef __ASSEMBLER__
+#ifndef _SYS_CDEFS_H
# include <sys/cdefs.h>
+#endif
/* If we don't have __REDIRECT, prototypes will be missing if
__USE_FILE_OFFSET64 but not __USE_LARGEFILE[64]. */