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RFA: #define _GNU_SOURCE to get strsignal prototoype


This removes some compilation warnings on older Red Hat systems.
#defining _GNU_SOURCE is the documented way to get these declarations
from GNU C Library header files.  From "(libc) Feature Test Macros":

       You should define these macros by using `#define' preprocessor
    directives at the top of your source code files.  These directives
    _must_ come before any `#include' of a system header file.  It is best
    to make them the very first thing in the file, preceded only by
    comments.  You could also use the `-D' option to GCC, but it's better
    if you make the source files indicate their own meaning in a
    self-contained way.

    ...

     - Macro: _GNU_SOURCE
         If you define this macro, everything is included: ISO C89,
         ISO C99, POSIX.1, POSIX.2, BSD, SVID, X/Open, LFS, and GNU
         extensions.  In the cases where POSIX.1 conflicts with BSD, the
         POSIX definitions take precedence.

2004-09-24  Jim Blandy  <jimb@redhat.com>

	* samples/async.c: #define _GNU_SOURCE before #including any
	files, to get prototypes for GNU-specific functions like
	strsignal.

Index: rda/samples/async.c
===================================================================
RCS file: /cvs/src/src/rda/samples/async.c,v
retrieving revision 1.1
diff -c -p -r1.1 async.c
*** rda/samples/async.c	28 Aug 2002 01:22:28 -0000	1.1
--- rda/samples/async.c	7 Oct 2004 16:03:08 -0000
***************
*** 22,27 ****
--- 22,29 ----
     Alternative licenses for RDA may be arranged by contacting Red Hat,
     Inc.  */
  
+ #define _GNU_SOURCE             /* enables strsignal prototype in <string.h> */
+ 
  #include "config.h"
  
  #include <stdio.h>


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