This is the mail archive of the
libc-alpha@sourceware.org
mailing list for the glibc project.
Re: [PING] [PATCH v2] manual: Document missing feature test macros.
- From: Joseph Myers <joseph at codesourcery dot com>
- To: Rical Jasan <ricaljasan at pacific dot net>
- Cc: libc-alpha <libc-alpha at sourceware dot org>, Michael Kerrisk <mtk dot manpages at gmail dot com>, Zack Weinberg <zackw at panix dot com>, Carlos O'Donell <carlos at redhat dot com>
- Date: Thu, 10 Aug 2017 22:26:46 +0000
- Subject: Re: [PING] [PATCH v2] manual: Document missing feature test macros.
- Authentication-results: sourceware.org; auth=none
- References: <20170728034305.13389-1-ricaljasan@pacific.net> <98c619b4-7058-d281-1020-8455a806307d@pacific.net>
OK, but suggested followups:
* In the description of _DEFAULT_SOURCE, note that features from the C
standard version used by the compiler are also enabled by default. (With
GCC 5 and later, which defaults to -std=gnu11, that means C11 features are
enabled, but unlike C99 they aren't part of the 2008 edition of POSIX, so
aren't already included in the description of default features.)
* Remove the statement about C99 not being widely adopted from the
description of _ISOC99_SOURCE. By now, C99 is widely adopted (in the Unix
world; I'm not sure about the state of Microsoft's compiler in that
regard, they've historically been better at keeping up with C++ than with
C).
* Consider obsoleting _ATFILE_SOURCE and making it into an alias for
_POSIX_C_SOURCE = 200809L if _POSIX_C_SOURCE is undefined or has a lower
value (similar to the _REENTRANT obsoletion); I don't think we really need
a separate feature test macro for this subset of POSIX features.
--
Joseph S. Myers
joseph@codesourcery.com