[PATCH] getopt.3: Fix feature test macro requirements for getopt()

The synopsis previously stated that getopt requires
_POSIX_C_SOURCE >= 2 || _XOPEN_SOURCE || _POSIX_SOURCE, but that
would be impossible, since _POSIX_SOURCE is a synonym for
_POSIX_C_SOURCE >= 1.

getopt was introduced to POSIX in POSIX.2.  The glibc headers
correctly test for that version.

Signed-off-by: Jonathan Nieder <redacted>
---
Hi,

I noticed this when trying to compile a program that uses getopt with
_POSIX_SOURCE.  Checking the headers, I see that unistd.h does not
include getopt.h unless __USE_POSIX2 is defined, and getopt.h does not
choose the standards-conforming implementation unless __USE_POSIX2 &&
!__USE_POSIX_IMPLICITLY && !__USE_GNU is defined.

The POSIX-1 2008 documentation [1] suggests that SVr2 had a getopt,
and the FreeBSD manpage [2] says BSD 4.3 had one, too.  So maybe
getopt should be exposed if either _BSD_SOURCE or _SVID_SOURCE is
defined.  But it isn’t currently.

Anyway, I hope the patch is of some use.

Thanks,
Jonathan

[1] http://www.opengroup.org/onlinepubs/9699919799/functions/getopt.html
[2] http://svn.freebsd.org/viewvc/base/head/lib/libc/stdlib/getopt.3?view=markup

 man3/getopt.3 |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/man3/getopt.3 b/man3/getopt.3
index 503f689..97ff60a 100644
--- a/man3/getopt.3
+++ b/man3/getopt.3

@@ -68,7 +68,7 @@ Feature Test Macro Requirements for glibc (see
 .in
 .sp
 .BR getopt ():
-_POSIX_C_SOURCE\ >=\ 2 || _XOPEN_SOURCE || _POSIX_SOURCE
+_POSIX_C_SOURCE\ >=\ 2 || _XOPEN_SOURCE
 .br
 .BR getopt_long (),
 .BR getopt_long_only ():

-- 
1.6.5.3

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