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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-02-12 12:46:31 +0100 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-03-01 20:01:04 +0100 |
| commit | f04d68ba16f9a1f650ab75b3514c3436c6c8b794 (patch) | |
| tree | a54712cdeeebd38e733e630b8536cd0aed27b9e6 /man7/feature_test_macros.7 | |
| parent | e9d91bcf4c15696e4f2009785f821b0ec26f24ad (diff) | |
| download | man-pages-f04d68ba16f9a1f650ab75b3514c3436c6c8b794.tar.gz | |
feature_test_macros.7: Clarify some _ISOC99_SOURCE / _DEFAULT_SOURCE details
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man7/feature_test_macros.7')
| -rw-r--r-- | man7/feature_test_macros.7 | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/man7/feature_test_macros.7 b/man7/feature_test_macros.7 index dde6f0fbbe..485ac9e8b7 100644 --- a/man7/feature_test_macros.7 +++ b/man7/feature_test_macros.7 @@ -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: |