Only declare __sigpause in installed signal.h when necessary.

This patch makes the installed signal.h declare __sigpause only when
necessary (when a macro definition of sigpause makes use of
__sigpause), rather than unconditionally.  This fixes false positives
in the linknamespace tests by making it visible to those tests that no
use of ISO C functionality will actually bring in the definition of
__sigpause and so bring in the other symbols defined in the same
object.  There is no bug filed in Bugzilla because this is fixing
false positives rather than any user-visible bug.

Tested for x86_64 (testsuite, and that installed stripped shared
libraries are unchanged by this patch).

	* signal/signal.h (__sigpause): Only declare if [__USE_XOPEN &&
	!__GNUC__].
	* include/signal.h (__sigpause): Move declaration above call to
	libc_hidden_proto.
	* conform/Makefile (test-xfail-ISO/signal.h/linknamespace): Remove
	variable.
	(test-xfail-ISO99/signal.h/linknamespace): Likewise.
	(test-xfail-ISO11/signal.h/linknamespace): Likewise.

1 files changed, 1 insertions, 1 deletions

diff --git a/signal/signal.h b/signal/signal.h
index fe9fd784dd..f1bbad04d3 100644
--- a/signal/signal.h
+++ b/signal/signal.h
@@ -164,12 +164,12 @@ extern void psiginfo (const siginfo_t *__pinfo, const char *__s);
 
    This function is a cancellation point and therefore not marked with
    __THROW.  */
-extern int __sigpause (int __sig_or_mask, int __is_sig);
 
 #ifdef __USE_XOPEN
 # ifdef __GNUC__
 extern int sigpause (int __sig) __asm__ ("__xpg_sigpause");
 # else
+extern int __sigpause (int __sig_or_mask, int __is_sig);
 /* Remove a signal from the signal mask and suspend the process.  */
 #  define sigpause(sig) __sigpause ((sig), 1)
 # endif