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Re: Should I define _GNU_SOURCE?

From: Eric Blake
Subject: Re: Should I define _GNU_SOURCE?
Date: Mon, 22 Jan 2018 10:58:07 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2

On 01/22/2018 09:55 AM, Victor Porton wrote:
> I am writing a software for Linux/Unix which could benefit from
> execvpe() C function.
> But this function is defined only when -D_GNU_SOURCE.
> Question 1: Should I ALWAYS use -D_GNU_SOURCE for compiler options no
> matter what are user options?

If you want to enable the use of a platform's extensions, the easiest
way is to use the AC_USE_SYSTEM_EXTENSIONS macro (rather than
-D_GNU_SOURCE, as that only works for a subset of systems), prior to the
rest of your that probes which extensions are now available.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization: |

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