Avoid -Wattribute-alias warnings for long double compat symbols

	* config/locale/gnu/c_locale.cc [_GLIBCXX_LONG_DOUBLE_COMPAT]: Ignore
	-Wattribute-alias warnings.
	* src/c++11/istream-inst.cc: Likewise.
	* src/c++11/locale-inst.cc: Likewise.
	* src/c++11/ostream-inst.cc: Likewise.
	* src/c++11/wlocale-inst.cc: Likewise.
	* src/c++98/hash-long-double-tr1-aux.cc: Likewise.

From-SVN: r254045

libstdc++-v3/ChangeLog

 2017-10-24  Jonathan Wakely  <jwakely@redhat.com>
 
+	* config/locale/gnu/c_locale.cc [_GLIBCXX_LONG_DOUBLE_COMPAT]: Ignore
+	-Wattribute-alias warnings.
+	* src/c++11/istream-inst.cc: Likewise.
+	* src/c++11/locale-inst.cc: Likewise.
+	* src/c++11/ostream-inst.cc: Likewise.
+	* src/c++11/wlocale-inst.cc: Likewise.
+	* src/c++98/hash-long-double-tr1-aux.cc: Likewise.
+
 	* include/bits/string_view.tcc (find_first_of, find_last_of)
 	(find_first_not_of, find_last_not_of): Add noexcept.
 	* include/std/string_view (basic_string_view(const _CharT*))

libstdc++-v3/config/locale/gnu/c_locale.cc

@@ -289,6 +289,7 @@ _GLIBCXX_END_NAMESPACE_VERSION
 
 // XXX GLIBCXX_ABI Deprecated
 #ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
+#pragma GCC diagnostic ignored "-Wattribute-alias"
 #define _GLIBCXX_LDBL_COMPAT(dbl, ldbl) \
   extern "C" void ldbl (void) __attribute__ ((alias (#dbl)))
 _GLIBCXX_LDBL_COMPAT(_ZSt14__convert_to_vIdEvPKcRT_RSt12_Ios_IostateRKP15__locale_struct, _ZSt14__convert_to_vIeEvPKcRT_RSt12_Ios_IostateRKP15__locale_struct);

libstdc++-v3/src/c++11/istream-inst.cc

@@ -97,6 +97,8 @@ _GLIBCXX_END_NAMESPACE_VERSION
 // XXX GLIBCXX_ABI Deprecated
 #ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
 
+#pragma GCC diagnostic ignored "-Wattribute-alias"
+
 #define _GLIBCXX_LDBL_COMPAT(dbl, ldbl) \
   extern "C" void ldbl (void) __attribute__ ((alias (#dbl), weak))
 _GLIBCXX_LDBL_COMPAT (_ZNSirsERd, _ZNSirsERe);

libstdc++-v3/src/c++11/locale-inst.cc

@@ -383,6 +383,8 @@ _GLIBCXX_END_NAMESPACE_VERSION
 #if defined _GLIBCXX_LONG_DOUBLE_COMPAT && defined C_is_char \
       && _GLIBCXX_USE_CXX11_ABI == 0
 
+#pragma GCC diagnostic ignored "-Wattribute-alias"
+
 #define _GLIBCXX_LDBL_COMPAT(dbl, ldbl) \
   extern "C" void ldbl (void) __attribute__ ((alias (#dbl), weak))
 

libstdc++-v3/src/c++11/ostream-inst.cc

@@ -100,6 +100,8 @@ _GLIBCXX_END_NAMESPACE_VERSION
 // XXX GLIBCXX_ABI Deprecated
 #ifdef _GLIBCXX_LONG_DOUBLE_COMPAT
 
+#pragma GCC diagnostic ignored "-Wattribute-alias"
+
 #define _GLIBCXX_LDBL_COMPAT(dbl, ldbl) \
   extern "C" void ldbl (void) __attribute__ ((alias (#dbl), weak))
 _GLIBCXX_LDBL_COMPAT (_ZNSolsEd, _ZNSolsEe);

libstdc++-v3/src/c++11/wlocale-inst.cc

@@ -37,6 +37,8 @@
 // XXX GLIBCXX_ABI Deprecated
 #if defined _GLIBCXX_LONG_DOUBLE_COMPAT
 
+#pragma GCC diagnostic ignored "-Wattribute-alias"
+
 #define _GLIBCXX_LDBL_COMPAT(dbl, ldbl) \
   extern "C" void ldbl (void) __attribute__ ((alias (#dbl), weak))
 

libstdc++-v3/src/c++98/hash-long-double-tr1-aux.cc

@@ -22,6 +22,8 @@
 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 // <http://www.gnu.org/licenses/>.
 
+#pragma GCC diagnostic ignored "-Wattribute-alias"
+
 namespace std _GLIBCXX_VISIBILITY(default)
 {
   namespace tr1