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Fix wait3 namespace (bug 21625)

The wait3 function was removed in the 2001 edition of POSIX.
sys/wait.h wrongly declares it for the 2001 and 2008 editions of POSIX
when XSI features are enabled.  This patch fixes the conditionals.

Tested for x86_64.

2017-06-19  Joseph Myers  <>

	[BZ #21625]
	* posix/sys/wait.h (strust rusage forward declaration): Change
	(wait3): Likewise.

diff --git a/posix/sys/wait.h b/posix/sys/wait.h
index 29ca453..6bb6668 100644
--- a/posix/sys/wait.h
+++ b/posix/sys/wait.h
@@ -133,7 +133,8 @@ extern int waitid (idtype_t __idtype, __id_t __id, siginfo_t *__infop,
 		   int __options);
-#if defined __USE_MISC || defined __USE_XOPEN_EXTENDED
+#if defined __USE_MISC \
+    || (defined __USE_XOPEN_EXTENDED && !defined __USE_XOPEN2K)
 /* This being here makes the prototypes valid whether or not
    we have already included <sys/resource.h> to define `struct rusage'.  */
 struct rusage;

Joseph S. Myers

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