[Bug libc/19029] New: _XOPEN_VERSION and _XOPEN_UNIX not defined in XSI conformance mode

["msebor at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19029

            Bug ID: 19029
           Summary: _XOPEN_VERSION and _XOPEN_UNIX not defined in XSI
                    conformance mode
           Product: glibc
           Version: 2.22
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: msebor at redhat dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

In Section 2.1.4 XSI Conformance, the latest POSIX spec states:

XSI-conforming implementations shall set the symbolic constant _XOPEN_UNIX to a 
value other than -1 and shall set the symbolic constant _XOPEN_VERSION to the
value 700.

The following test shows that the latest glibc fails to define either
_XOPEN_VERSION or _XOPEN_UNIX.  This problem came up while developing a
portable application that relies on _XOPEN_NAME_MAX, which is also missing
(this is the subject of bug 18229.

#define _XOPEN_SOURCE 700

#include <limits.h>

#define A(expr) _Static_assert (expr, #expr)

A (_XOPEN_UNIX != -1);
A (_XOPEN_VERSION == _XOPEN_SOURCE)
A (_XOPEN_NAME_MAX == 255);
A (_XOPEN_PATH_MAX == 1024);

tst-xopen.c:7:4: error: â_XOPEN_UNIXâ undeclared here (not in a function)
 A (_XOPEN_UNIX != -1);
    ^
tst-xopen.c:5:33: note: in definition of macro âAâ
 #define A(expr) _Static_assert (expr, #expr)
                                 ^
tst-xopen.c:7:4: error: expression in static assertion is not an integer
 A (_XOPEN_UNIX != -1);
    ^
tst-xopen.c:5:33: note: in definition of macro âAâ
 #define A(expr) _Static_assert (expr, #expr)
                                 ^
tst-xopen.c:8:4: error: â_XOPEN_VERSIONâ undeclared here (not in a function)
 A (_XOPEN_VERSION == _XOPEN_SOURCE)
    ^
tst-xopen.c:5:33: note: in definition of macro âAâ
 #define A(expr) _Static_assert (expr, #expr)
                                 ^
tst-xopen.c:8:4: error: expression in static assertion is not an integer
 A (_XOPEN_VERSION == _XOPEN_SOURCE)
    ^
tst-xopen.c:5:33: note: in definition of macro âAâ
 #define A(expr) _Static_assert (expr, #expr)
                                 ^
tst-xopen.c:5:17: error: expected â;â before â_Static_assertâ
 #define A(expr) _Static_assert (expr, #expr)
                 ^
tst-xopen.c:9:1: note: in expansion of macro âAâ
 A (_XOPEN_NAME_MAX == 255);
 ^
tst-xopen.c:10:4: error: â_XOPEN_PATH_MAXâ undeclared here (not in a function)
 A (_XOPEN_PATH_MAX == 1024);
    ^
tst-xopen.c:5:33: note: in definition of macro âAâ
 #define A(expr) _Static_assert (expr, #expr)
                                 ^
tst-xopen.c:10:4: error: expression in static assertion is not an integer
 A (_XOPEN_PATH_MAX == 1024);
    ^
tst-xopen.c:5:33: note: in definition of macro âAâ
 #define A(expr) _Static_assert (expr, #expr)
                                 ^

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