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Re: _DEFAULT_SOURCE expected semantic

From: Carlos O'Donell <codonell at redhat dot com>
To: Andreas Schwab <schwab at suse dot de>, Adhemerval Zanella <adhemerval dot zanella at linaro dot org>
Cc: GNU C Library <libc-alpha at sourceware dot org>
Date: Wed, 10 Apr 2019 09:08:48 -0400
Subject: Re: _DEFAULT_SOURCE expected semantic
References: <a723396f-2b82-8c77-0c4a-51cd70df65dc@linaro.org> <mvmd0luhvc2.fsf@suse.de>

On 4/10/19 8:57 AM, Andreas Schwab wrote:

On Apr 10 2019, Adhemerval Zanella <adhemerval.zanella@linaro.org> wrote:

So _DEFAULT_SOURCE always defines -D_POSIX_C_SOURCE=200809L without
implicit _XOPEN_SOURCE from glibc 2.19 to 2.30.  Afaik there is no need to
currently to add POSIX1.2017 support, so the question is whether
glibc will continue to eforce -D_POSIX_C_SOURCE=200809L for
_DEFAULT_SOURCE in future versions or if the flag will eventually be update
whether/once a new POSIX1 version is required.


I think _DEFAULT_SOURCE should always be what is considered state of the
art, similar to gcc default for -std moving forward.


Agreed.

--
Cheers,
Carlos.

References:
- _DEFAULT_SOURCE expected semantic
  - From: Adhemerval Zanella
- Re: _DEFAULT_SOURCE expected semantic
  - From: Andreas Schwab

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