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-rw-r--r--include/features.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/features.h b/include/features.h
index 0c729e8a3e..7f99741a95 100644
--- a/include/features.h
+++ b/include/features.h
@@ -56,6 +56,7 @@
    header files to decide what to declare or define:
 
    __USE_ISOC99		Define ISO C99 things.
+   __USE_ISOC95		Define ISO C90 AMD1 (C95) things.
    __USE_POSIX		Define IEEE Std 1003.1 things.
    __USE_POSIX2		Define IEEE Std 1003.2 things.
    __USE_POSIX199309	Define IEEE Std 1003.1, and .1b things.
@@ -90,6 +91,7 @@
 
 /* Undefine everything, so we get a clean slate.  */
 #undef	__USE_ISOC99
+#undef	__USE_ISOC95
 #undef	__USE_POSIX
 #undef	__USE_POSIX2
 #undef	__USE_POSIX199309
@@ -184,6 +186,12 @@
 # define __USE_ISOC99	1
 #endif
 
+/* This is to enable the ISO C90 Amendment 1:1995 extension.  */
+#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
+     || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L))
+# define __USE_ISOC95	1
+#endif
+
 /* If none of the ANSI/POSIX macros are defined, use POSIX.1 and POSIX.2
    (and IEEE Std 1003.1b-1993 unless _XOPEN_SOURCE is defined).  */
 #if ((!defined __STRICT_ANSI__ || (_XOPEN_SOURCE - 0) >= 500) && \