re PR bootstrap/52947 (bootstrap fails due to wrong include search path composition)

        PR bootstrap/52947
        * config/i386/mingw32.h (NATIVE_SYSTEM_HEADER_DIR): Define it always
        as "/mingw/include".

From-SVN: r189338

gcc/ChangeLog

+2012-07-06  Kai Tietz  <ktietz@redhat.com>
+
+	PR bootstrap/52947
+	* config/i386/mingw32.h (NATIVE_SYSTEM_HEADER_DIR): Define it always
+	as "/mingw/include".
+
 2012-07-06  Alexandre Oliva  <aoliva@redhat.com>
 
 	PR debug/53820

gcc/config/i386/mingw32.h

@@ -150,6 +150,11 @@ along with GCC; see the file COPYING3.  If not see
 #define STANDARD_STARTFILE_PREFIX_2 ""
 #endif
 
+/* For native mingw-version we need to take care that NATIVE_SYSTEM_HEADER_DIR
+   macro contains POSIX-style path.  See bug 52947.  */
+#undef NATIVE_SYSTEM_HEADER_DIR
+#define NATIVE_SYSTEM_HEADER_DIR "/mingw/include"
+
 /* Output STRING, a string representing a filename, to FILE.
    We canonicalize it to be in Unix format (backslashes are replaced
    forward slashes.  */