LDP
/
man-pages
mirror of https://github.com/mkerrisk/man-pages
0
1
Fork 0
Code Releases Activity

feature_test_macros.7: Document _DEFAULT_SOURCE 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2014-01-06 15:17:54 +13:00
parent 0385c88eda
commit ba694dd0b0
1 changed files with 13 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
man7/feature_test_macros.7
View File

@ -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";