From d78099052b6bdc164f8f6a582a9b7b574f700e28 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@gmail.com>
Date: Fri, 23 Dec 2011 22:45:16 -0500
Subject: Support C11 __STDC_SOURCE__ and _ISOC11_SOURCE

---
 include/features.h | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

(limited to 'include/features.h')

diff --git a/include/features.h b/include/features.h
index c7b7972806..b02ff750d3 100644
--- a/include/features.h
+++ b/include/features.h
@@ -25,6 +25,7 @@
 
    __STRICT_ANSI__	ISO Standard C.
    _ISOC99_SOURCE	Extensions to ISO C89 from ISO C99.
+   _ISOC11_SOURCE	Extensions to ISO C99 from ISO C11.
    _POSIX_SOURCE	IEEE Std 1003.1.
    _POSIX_C_SOURCE	If ==1, like _POSIX_SOURCE; if >=2 add IEEE Std 1003.2;
 			if >=199309L, add IEEE Std 1003.1b-1993;
@@ -57,6 +58,7 @@
    These are defined by this file and are used by the
    header files to decide what to declare or define:
 
+   __USE_ISOC11		Define ISO C11 things.
    __USE_ISOC99		Define ISO C99 things.
    __USE_ISOC95		Define ISO C90 AMD1 (C95) things.
    __USE_POSIX		Define IEEE Std 1003.1 things.
@@ -95,6 +97,7 @@
 
 
 /* Undefine everything, so we get a clean slate.  */
+#undef	__USE_ISOC11
 #undef	__USE_ISOC99
 #undef	__USE_ISOC95
 #undef	__USE_POSIX
@@ -158,6 +161,8 @@
 # define _ISOC95_SOURCE	1
 # undef  _ISOC99_SOURCE
 # define _ISOC99_SOURCE	1
+# undef  _ISOC11_SOURCE
+# define _ISOC11_SOURCE	1
 # undef  _POSIX_SOURCE
 # define _POSIX_SOURCE	1
 # undef  _POSIX_C_SOURCE
@@ -185,17 +190,18 @@
 # define _SVID_SOURCE	1
 #endif
 
-/* This is to enable the ISO C99 extension.  Also recognize the old macro
-   which was used prior to the standard acceptance.  This macro will
-   eventually go away and the features enabled by default once the ISO C99
-   standard is widely adopted.  */
-#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
+/* This is to enable the ISO C11 extension.  */
+#if (defined _ISOC11_SOURCE \
+     || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 201112L))
+
+/* This is to enable the ISO C99 extension.  */
+#if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \
      || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
 # define __USE_ISOC99	1
 #endif
 
 /* This is to enable the ISO C90 Amendment 1:1995 extension.  */
-#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
+#if (defined _ISOC99_SOURCE || defined _ISOC11_SOURCE \
      || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199409L))
 # define __USE_ISOC95	1
 #endif
-- 
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