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Re: Should I define _GNU_SOURCE?
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From: |
Eric Blake |
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Subject: |
Re: Should I define _GNU_SOURCE? |
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Date: |
Mon, 22 Jan 2018 10:58:07 -0600 |
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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 configure.ac that probes which extensions are now available.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
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