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| author | Rical Jasan <ricaljasan@pacific.net> | 2018-02-19 04:37:16 -0800 |
|---|---|---|
| committer | Rical Jasan <ricaljasan@pacific.net> | 2018-02-21 02:38:42 -0800 |
| commit | 862b45026fa67277a554eb329538a7d536311eca (patch) | |
| tree | 70b0265c55a4af5b4c11563ce536f19014bc8fe5 | |
| parent | 999a6dab3ee1c8e77bb348ba2389e7aeb5c062b2 (diff) | |
| download | glibc-862b45026fa67277a554eb329538a7d536311eca.zip glibc-862b45026fa67277a554eb329538a7d536311eca.tar.gz glibc-862b45026fa67277a554eb329538a7d536311eca.tar.bz2 | |
manual: Update _DEFAULT_SOURCE. [BZ #22862]
The description of the interplay between feature test macros and
compiler options in the description of _DEFAULT_SOURCE is a little
confusing, and dated, so clarify the situation, and don't assume a
specific value for _DEFAULT_SOURCE.
Also, _DEFAULT_SOURCE is supposed to be defined if none of the C/POSIX
feature test macros are defined, but the condition was lacking a test
for _ISOC11_SOURCE, so that is also addressed.
[BZ #22862]
* include/features.h: Add _ISOC11_SOURCE to test for whether
to define _DEFAULT_SOURCE.
* manual/creature.texi (_DEFAULT_SOURCE): Improve
documentation.
| -rw-r--r-- | ChangeLog | 7 | ||||
| -rw-r--r-- | include/features.h | 2 | ||||
| -rw-r--r-- | manual/creature.texi | 21 |
3 files changed, 22 insertions, 8 deletions
@@ -1,3 +1,10 @@ +2018-02-21 Rical Jasan <ricaljasan@pacific.net> + + [BZ #22862] + * include/features.h: Add _ISOC11_SOURCE to test for whether to + define _DEFAULT_SOURCE. + * manual/creature.texi (_DEFAULT_SOURCE): Improve documentation. + 2018-02-21 Florian Weimer <fweimer@redhat.com> [BZ #20890] diff --git a/include/features.h b/include/features.h index 137a90b..d22c32e 100644 --- a/include/features.h +++ b/include/features.h @@ -214,7 +214,7 @@ define _DEFAULT_SOURCE. */ #if (defined _DEFAULT_SOURCE \ || (!defined __STRICT_ANSI__ \ - && !defined _ISOC99_SOURCE \ + && !defined _ISOC99_SOURCE && !defined _ISOC11_SOURCE \ && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE \ && !defined _XOPEN_SOURCE)) # undef _DEFAULT_SOURCE diff --git a/manual/creature.texi b/manual/creature.texi index fe7a779..8876b2a 100644 --- a/manual/creature.texi +++ b/manual/creature.texi @@ -221,13 +221,20 @@ precedence. If you define this macro, most features are included apart from X/Open, LFS and GNU extensions: the effect is to enable features from the 2008 edition of POSIX, as well as certain BSD and SVID features -without a separate feature test macro to control them. Defining this -macro, on its own and without using compiler options such as -@option{-ansi} or @option{-std=c99}, has the same effect as not -defining any feature test macros; defining it together with other -feature test macros, or when options such as @option{-ansi} are used, -enables those features even when the other options would otherwise -cause them to be disabled. +without a separate feature test macro to control them. + +Be aware that compiler options also affect included features: + +@itemize +@item +If you use a strict conformance option, features beyond those from the +compiler's language version will be disabled, though feature test +macros may be used to enable them. + +@item +Features enabled by compiler options are not overridden by feature +test macros. +@end itemize @end defvr @defvr Macro _ATFILE_SOURCE |