re PR bootstrap/69506 (check-in 232454 seems to cause problems with cygwin builds)

2017-05-02  Hugo Beauzée-Luyssen <hugo@beauzee.fr>

	PR libstdc++/69506
	* config/os/mingw32-w64/os_defines.h (_GLIBCXX_USE_WEAK_REF): Define.

From-SVN: r247502

libstdc++-v3/ChangeLog

+2017-05-02  Hugo Beauzée-Luyssen <hugo@beauzee.fr>
+
+	PR libstdc++/69506
+	* config/os/mingw32-w64/os_defines.h (_GLIBCXX_USE_WEAK_REF): Define.
+
 2017-04-29  François Dumont  <fdumont@gcc.gnu.org>
 
 	* testsuite/libstdc++-prettyprinters/48362.cc: Replace a regexp-test

libstdc++-v3/config/os/mingw32-w64/os_defines.h

@@ -76,6 +76,8 @@
 
 #ifdef __x86_64__
 #define _GLIBCXX_LLP64 1
+// See libstdc++/69506
+#define _GLIBCXX_USE_WEAK_REF 0
 #endif
 
 // Enable use of GetModuleHandleEx (requires Windows XP/2003) in