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| -rw-r--r-- | man7/feature_test_macros.7 | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/man7/feature_test_macros.7 b/man7/feature_test_macros.7 index d8c6134c95..527bf733cb 100644 --- a/man7/feature_test_macros.7 +++ b/man7/feature_test_macros.7 @@ -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 |