[Bug libc/4364] New: _XOPEN_VERSION and unistd.h

[Bug libc/4364] New: _XOPEN_VERSION and unistd.h

[madcoder at debian dot org]

quoting from: http://bugs.debian.org/203412, attached is a patch

===================================================================
SUSv3 [0] states that:

  The following symbolic constant shall be defined only if the
  implementation supports the XSI option; see XSI Conformance.
  
    _XOPEN_VERSION
    [XSI] 
    Integer value indicating version of the X/Open Portability Guide to
        which the implementation conforms. The value shall be 600. 

It furthermore states [0]:

  _XOPEN_UNIX
    [XSI] 
     The implementation supports the XSI extension.

Therefore, if _XOPEN_UNIX is defined, as it is, unconditionally to 1,
then at least at some time _XOPEN_VERSION must be defined to 600.

The only place I can find that _XOPEN_VERSION is mentioned is unistd.h,
which has the following snippet of code:

  /* X/Open version number to which the library conforms.  It is selectable.  
*/
  #ifdef __USE_UNIX98
  # define _XOPEN_VERSION       500
  #else
  # define _XOPEN_VERSION       4
  #endif

There is a complicated set of preprocessor directives in features.h that
chooses appropriately; for _XOPEN_SOURCE=600, _XOPEN_VERSION=500, not
600. Oops.


  [0] http://www.opengroup.org/onlinepubs/007904975/basedefs/unistd.h.html

-- 
           Summary: _XOPEN_VERSION and unistd.h
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: madcoder at debian dot org
                CC: glibc-bugs at sources dot redhat dot com


http://sourceware.org/bugzilla/show_bug.cgi?id=4364

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[Bug libc/4364] _XOPEN_VERSION and unistd.h

[madcoder at debian dot org]

------- Additional Comments From madcoder at debian dot org  2007-04-15 00:45 -------
Created an attachment (id=1688)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=1688&action=view)
XOPEN_VERSION will be 600
when __USE_XOPEN2K is defined.

XOPEN_VERSION will be 600 when __USE_XOPEN2K is defined.

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[Bug libc/4364] _XOPEN_VERSION and unistd.h

[jakub at redhat dot com]

------- Additional Comments From jakub at redhat dot com  2007-04-15 01:08 -------
I'd use #elif instead, other than that it looks ok to me.
/* X/Open version number to which the library conforms.  It is selectable.  */
#ifdef __USE_XOPEN2K
# define _XOPEN_VERSION 600
#elif defined __USE_UNIX98
# define _XOPEN_VERSION 500
#else
# define _XOPEN_VERSION 4
#endif


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[Bug libc/4364] _XOPEN_VERSION and unistd.h

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2007-04-17 00:44 -------
I checked in the patch.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


http://sourceware.org/bugzilla/show_bug.cgi?id=4364

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[Bug libc/4364] _XOPEN_VERSION and unistd.h

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2007-07-12 15:10 -------
Subject: Bug 4364

CVSROOT:	/cvs/glibc
Module name:	libc
Branch: 	glibc-2_5-branch
Changes by:	jakub@sourceware.org	2007-07-12 15:09:59

Modified files:
	.              : ChangeLog 
	posix          : unistd.h 

Log message:
	2007-04-16  Ulrich Drepper  <drepper@redhat.com>
	
	[BZ #4364]
	* posix/unistd.h (_XOPEN_VERSION): Define appropriately for SUSv3.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/libc/ChangeLog.diff?cvsroot=glibc&only_with_tag=glibc-2_5-branch&r1=1.10362.2.66&r2=1.10362.2.67
http://sourceware.org/cgi-bin/cvsweb.cgi/libc/posix/unistd.h.diff?cvsroot=glibc&only_with_tag=glibc-2_5-branch&r1=1.147&r2=1.147.2.1



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