From 2382038f343fdd56e8ba0a26be8e93f30aed048d Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@operamail.com>
Date: Fri, 16 Oct 2015 01:03:11 +0200
Subject: C89 == C90 == ANSI C == Standard C
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Signed-off-by: Mattias Andrée <maandree@operamail.com>
---
 doc/info/chap/introduction.texinfo | 10 +++++++++-
 include/slibc/c-version.h          | 17 +++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/doc/info/chap/introduction.texinfo b/doc/info/chap/introduction.texinfo
index 21982f6..2f3c2f5 100644
--- a/doc/info/chap/introduction.texinfo
+++ b/doc/info/chap/introduction.texinfo
@@ -257,14 +257,22 @@ defines for header files and functions are disabled.
 macros defined by other projects.
 
 @table @code
-@item _ISOC90_SOURCE
+@item _ISOC89_SOURCE
+@itemx _ISOC90_SOURCE
 @cpindex @sc{ISO}@tie{}C
 @cpindex C90
+@cpindex C89
+@cpindex @sc{ANSI}@tie{}C
 @lvindex _ISOC90_SOURCE
+@lvindex _ISOC89_SOURCE
 Enables functionality from the @sc{ISO}@tie{}C90
 standard, even if the program is not compiled
 with C90.
 
+Note, @sc{ISO}@tie{}C89, @sc{ISO}@tie{}C90,
+@sc{ANSI}@tie{}C and Standard C, all refer to
+the same standard.
+
 @item _ISOC99_SOURCE
 @cpindex @sc{ISO}@tie{}C
 @cpindex C99
diff --git a/include/slibc/c-version.h b/include/slibc/c-version.h
index 635ddb4..0cd5c3e 100644
--- a/include/slibc/c-version.h
+++ b/include/slibc/c-version.h
@@ -79,3 +79,20 @@
 # endif
 #endif
 
+/**
+ * C89, C90, ANSI C and Standard C are all the
+ * same standard.
+ */
+#if defined(__C89__) && !defined(__C90__)
+# define __C90__
+#endif
+#if defined(__C90__) && !defined(__C89__)
+# define __C89__
+#endif
+#if defined(__ISOC89_SOURCE) && !defined(__ISOC90_SOURCE)
+# define __ISOC90_SOURCE
+#endif
+#if defined(__ISOC90_SOURCE) && !defined(__ISOC89_SOURCE)
+# define __ISOC89_SOURCE
+#endif
+
-- 
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