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feature_test_macros.7: Give an early hint about some macros being defined by default 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2016-02-12 20:12:46 +01:00
parent 9db90c7cc9
commit 38d9e98ea3
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6
man7/feature_test_macros.7
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@ -139,6 +139,12 @@ The macros that you most likely need to use in modern source code are
.BR _DEFAULT_SOURCE
(to get definitions that would normally be provided by default).
.IP *
Certain macros are defined with default values.
Thus, although one or more macros may be indicated as being
required in the SYNOPSIS of a man page,
it may not be necessary to define them explicitly.
Full details of the defaults are given later in this man page.
.IP *
Defining
.BR _XOPEN_SOURCE
with a value of 600 or greater produces the same effects as defining