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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2014-01-06 15:17:54 +1300 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2014-01-08 12:14:13 +1300 |
| commit | ba694dd0b0f926f77a7876d02adca96578cd13e4 (patch) | |
| tree | 6eefb484e1e699c1f29ca64adc5859c827110003 /man7 | |
| parent | 0385c88eda6a369a3444c541494a457c83cdbe58 (diff) | |
| download | man-pages-ba694dd0b0f926f77a7876d02adca96578cd13e4.tar.gz | |
feature_test_macros.7: Document _DEFAULT_SOURCE
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man7')
| -rw-r--r-- | man7/feature_test_macros.7 | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/man7/feature_test_macros.7 b/man7/feature_test_macros.7 index 02d6cef49e..bfdc3d37a5 100644 --- a/man7/feature_test_macros.7 +++ b/man7/feature_test_macros.7 @@ -281,6 +281,19 @@ System V-derived definitions. (SVID == System V Interface Definition; see .BR standards (7).) .TP +.BR _DEFAULT_SOURCE " (since glibc 2.19)" +Defining this macro provides an effect similar to +the feature test macros that are defined by default; that is: + + cc \-D_BSD_SOURCE \-D_SVID_SOURCE \-D_POSIX_C_SOURCE=200809 + +This macro can be defined to ensure that the "default" +definitions are provided even when the defaults would otherwise +be disabled, +as happens when individual macros are explicitly defined, +or the compiler is invoked in one of its "standard" modes (e.g., +.IR "cc\ \-std=c99" ). +.TP .BR _ATFILE_SOURCE " (since glibc 2.4)" Defining this macro with any value causes header files to expose declarations of a range of functions with the suffix "at"; |