From: Michael Kerrisk <mtk.manpages@gmail.com>
Date: Fri, 21 Apr 2006 07:01:40 +0000 (+0000)
Subject: A few small additions
X-Git-Tag: man-pages-2.31~68
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9eaee631778191927c17923d07df24f03d43e923;p=thirdparty%2Fman-pages.git

A few small additions
---

diff --git a/man7/ftm.7 b/man7/ftm.7
index ce63c11534..f3991e8cf2 100644
--- a/man7/ftm.7
+++ b/man7/ftm.7
@@ -81,7 +81,7 @@ is defined, then expose definitions corresponding to the XPG4v2
 UNIX extensions.
 .TP
 .B _ISOC99_SOURCE
-Exposes C 99 extensions to IOC C (1990).
+Exposes C 99 extensions to ISO C (1990).
 .TP
 .B _LARGEFILE64_SOURCE
 Expose definitions for the alternative API specified by the 
@@ -119,6 +119,25 @@ and
 .BR _XOPEN_SOURCE
 with the value 600.
 In addition, various GNU-specific extensions are also exposed.
+.PP
+When
+.BR gcc (1)
+is invoked, then the following macros are defined by default:
+.BR _BSD_SOURCE ,
+.BR _SVID_SOURCE ,
+.BR _POSIX_SOURCE ,
+and
+.BR POSIX_C_SOURCE =199506.
+If individual macros are defined, then other macros are disabled
+unless they are also explicitly defined.  (Exception:
+if 
+.BR POSIX_C_SOURCE
+is not otherwise defined, 
+then it is always defined with the value 199506,
+unless the compiler is invoked in one of is standard modes, e.g., the
+.I -std=c99
+flag.)
+Multiple macros can be defined; the results are additive.
 .SH CONFORMING TO
 POSIX.1 specifies
 .BR _POSIX_C_SOURCE ,
@@ -142,4 +161,3 @@ Other systems have an analogous file, but typically with a different name.
 This header file is automatically included by other header files as 
 required: it is not necessary to explicitly include it in order to 
 employ feature test macros.
-.SH "SEE ALSO"