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feature_test_macros.7: Clarify some _ISOC99_SOURCE / _DEFAULT_SOURCE details 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2016-02-12 12:46:31 +01:00
parent e9d91bcf4c
commit f04d68ba16
1 changed files with 7 additions and 5 deletions
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man7/feature_test_macros.7
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@ -221,9 +221,11 @@ definitions for POSIX.1c (threads).
.IP \(bu
(Since glibc 2.3.3)
The value 200112L or greater additionally exposes definitions corresponding
to the POSIX.1-2001 base specification (excluding the XSI extension)
and also causes C95 (since glibc 2.12) and
C99 (since glibc 2.10) features to be exposed.
to the POSIX.1-2001 base specification (excluding the XSI extension).
This value also causes C95 (since glibc 2.12) and
C99 (since glibc 2.10) features to be exposed
(in other words, the equivalent of defining
.BR _ISOC99_SOURCE ).
.IP \(bu
(Since glibc 2.10)
The value 200809L or greater additionally exposes definitions corresponding
@ -458,8 +460,8 @@ Defining
without defining other individual macros
or invoking the compiler in one of its "standard" modes has no effect.
The "default" definitions comprise those required by POSIX.1-2008
as well as various definitions derived from BSD and System V.
The "default" definitions comprise those required by POSIX.1-2008 and ISO C99,
as well as various definitions originally derived from BSD and System V.
On glibc 2.19 and earlier, these defaults were approximately equivalent
to explicitly defining the following: