re PR libstdc++/69446 (cow-stdexcept.cc:374:1: error: alias d efinitions not…

re PR libstdc++/69446 (cow-stdexcept.cc:374:1: error: alias d efinitions not supported in this configuration)

	PR libstdc++/69446
	* config/os/hpux/os_defines.h (_GLIBCXX_USE_WEAK_REF): Define.

From-SVN: r232769

libstdc++-v3/ChangeLog

+2016-01-23  John David Anglin  <danglin@gcc.gnu.org>
+
+	PR libstdc++/69446
+	* config/os/hpux/os_defines.h (_GLIBCXX_USE_WEAK_REF): Define.
+
 2016-01-22  Edward Smith-Rowland  <3dw4rd@verizon.net>
 
 	TR29124 C++ Special Math - <math.h> pulls funcs into global namespace.

libstdc++-v3/config/os/hpux/os_defines.h

@@ -99,6 +99,9 @@ typedef long int __padding_type;
    to null pointers when weak symbol support is on.  */
 #define _GLIBCXX_GTHREAD_USE_WEAK 0
 
+// No support for referencing weak symbols without a definition.
+#define _GLIBCXX_USE_WEAK_REF 0
+
 // The strtold function is obsolete and not C99 conformant on PA HP-UX.
 // It returns plus or minus _LDBL_MAX instead of plus or minus HUGE_VALL
 // if the correct value would cause overflow.  It doesn't handle "inf",