Hi, Workaround now exists for trunk mingw-w64 headers. Kai approved over IRC, so anybody with commit rights please push.
ChangeLog
2012-10-29 Jonathan Yong <jo...@users.sourceforge.net>
* config/os/mingw32-w64/os_defines.h: Remove
_GLIBCXX_HAVE_BROKEN_VSWPRINTF
as no longer required.
Index: libstdc++-v3/config/os/mingw32-w64/os_defines.h
===================================================================
--- libstdc++-v3/config/os/mingw32-w64/os_defines.h (revision 192802)
+++ libstdc++-v3/config/os/mingw32-w64/os_defines.h (working copy)
@@ -63,8 +63,9 @@
// See libstdc++/20806.
#define _GLIBCXX_HAVE_DOS_BASED_FILESYSTEM 1
-// See libstdc++/37522.
-#define _GLIBCXX_HAVE_BROKEN_VSWPRINTF 1
+// See libstdc++/37522. mingw-w64 stdio redirect for C++
+// #define _GLIBCXX_HAVE_BROKEN_VSWPRINTF 1
+// Workaround added for mingw-w64 trunk headers r5437
// See libstdc++/43738
// On native windows targets there is no ioctl function. And the existing
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