[Bug libc/22125] New: Incorrect feature test macro markings for pthread_mutexattr_setrobust() and pthread_mutexattr_getrobust()

["mtk.manpages at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22125

            Bug ID: 22125
           Summary: Incorrect feature test macro markings for
                    pthread_mutexattr_setrobust() and
                    pthread_mutexattr_getrobust()
           Product: glibc
           Version: 2.27
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: mtk.manpages at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

The macro guarding pthread_mutexattr_setrobust() and
pthread_mutexattr_getrobust() in sysdeps/nptl/pthread.h is __USE_XOPEN2K.
However, these two APIs first appeared in POSIX.1-2008/SUSv4. Therefore, the
macro should be __USE_XOPEN2K8.

Note that the closely related pthread_mutex_consistent(), which also first
appeared in POSIX.1-2008/SUSv4, is correctly guarded with __USE_XOPEN2K8 in the
same header file.

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