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A few small additions

This commit is contained in:
Michael Kerrisk 2006-04-21 07:01:40 +00:00
parent 50e5322c85
commit 9eaee63177
1 changed files with 20 additions and 2 deletions
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22
man7/ftm.7
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@ -81,7 +81,7 @@ is defined, then expose definitions corresponding to the XPG4v2
UNIX extensions.
.TP
.B _ISOC99_SOURCE
Exposes C 99 extensions to IOC C (1990).
Exposes C 99 extensions to ISO C (1990).
.TP
.B _LARGEFILE64_SOURCE
Expose definitions for the alternative API specified by the
@ -119,6 +119,25 @@ and
.BR _XOPEN_SOURCE
with the value 600.
In addition, various GNU-specific extensions are also exposed.
.PP
When
.BR gcc (1)
is invoked, then the following macros are defined by default:
.BR _BSD_SOURCE ,
.BR _SVID_SOURCE ,
.BR _POSIX_SOURCE ,
and
.BR POSIX_C_SOURCE =199506.
If individual macros are defined, then other macros are disabled
unless they are also explicitly defined. (Exception:
if
.BR POSIX_C_SOURCE
is not otherwise defined,
then it is always defined with the value 199506,
unless the compiler is invoked in one of is standard modes, e.g., the
.I -std=c99
flag.)
Multiple macros can be defined; the results are additive.
.SH CONFORMING TO
POSIX.1 specifies
.BR _POSIX_C_SOURCE ,
@ -142,4 +161,3 @@ Other systems have an analogous file, but typically with a different name.
This header file is automatically included by other header files as
required: it is not necessary to explicitly include it in order to
employ feature test macros.
.SH "SEE ALSO"