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Re: RFA: #define _GNU_SOURCE to get strsignal prototoype


Kevin Buettner <kevinb@redhat.com> writes:

> On 07 Oct 2004 11:08:01 -0500
> Jim Blandy <jimb@redhat.com> wrote:
> 
> > 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.
> 
> Okay.

Committed, thanks.


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