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Re: RFA: #define _GNU_SOURCE to get strsignal prototoype
- From: Jim Blandy <jimb at redhat dot com>
- To: Kevin Buettner <kevinb at redhat dot com>
- Cc: rda at sources dot redhat dot com
- Date: 07 Oct 2004 14:11:03 -0500
- Subject: Re: RFA: #define _GNU_SOURCE to get strsignal prototoype
- References: <vt2ekkazf32.fsf@zenia.home> <20041007091109.7177ed53@saguaro>
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.