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-rw-r--r--doc/info/chap/introduction.texinfo10
1 files changed, 9 insertions, 1 deletions
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