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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) && \