Only declare __sigpause in installed signal.h when necessary

[Joseph Myers <joseph at codesourcery dot com>]

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).

2014-11-14  Joseph Myers  <joseph@codesourcery.com>

	* 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.

diff --git a/conform/Makefile b/conform/Makefile
index 45917a6..b2806b1 100644
--- a/conform/Makefile
+++ b/conform/Makefile
@@ -326,19 +326,16 @@ test-xfail-XOPEN2K8/ndbm.h/linknamespace = yes
 
 # Unsorted expected failures.
 test-xfail-ISO/math.h/linknamespace = yes
-test-xfail-ISO/signal.h/linknamespace = yes
 test-xfail-ISO/stdio.h/linknamespace = yes
 test-xfail-ISO/time.h/linknamespace = yes
 test-xfail-ISO99/complex.h/linknamespace = yes
 test-xfail-ISO99/ctype.h/linknamespace = yes
 test-xfail-ISO99/math.h/linknamespace = yes
-test-xfail-ISO99/signal.h/linknamespace = yes
 test-xfail-ISO99/stdio.h/linknamespace = yes
 test-xfail-ISO99/tgmath.h/linknamespace = yes
 test-xfail-ISO11/complex.h/linknamespace = yes
 test-xfail-ISO11/ctype.h/linknamespace = yes
 test-xfail-ISO11/math.h/linknamespace = yes
-test-xfail-ISO11/signal.h/linknamespace = yes
 test-xfail-ISO11/stdio.h/linknamespace = yes
 test-xfail-ISO11/tgmath.h/linknamespace = yes
 test-xfail-XPG3/ctype.h/linknamespace = yes
diff --git a/include/signal.h b/include/signal.h
index 16a7a42..f7a9de0 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -10,6 +10,7 @@ libc_hidden_proto (sigfillset)
 libc_hidden_proto (sigaddset)
 libc_hidden_proto (sigdelset)
 libc_hidden_proto (sigismember)
+extern int __sigpause (int sig_or_mask, int is_sig);
 libc_hidden_proto (__sigpause)
 libc_hidden_proto (raise)
 libc_hidden_proto (__libc_current_sigrtmin)
@@ -49,7 +50,6 @@ extern int __libc_sigaction (int sig, const struct sigaction *act,
 			     struct sigaction *oact);
 libc_hidden_proto (__libc_sigaction)
 
-extern int __sigpause (int sig_or_mask, int is_sig);
 extern int __default_sigpause (int mask);
 extern int __xpg_sigpause (int sig);
 
diff --git a/signal/signal.h b/signal/signal.h
index fe9fd78..f1bbad0 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

-- 
Joseph S. Myers
joseph@codesourcery.com