[Bug libstdc++/69881] with gcc-6 of today building gcc-4.9 fails

[bernd.edlinger at hotmail dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69881

--- Comment #9 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
right now I am trying to boot-strap this:

Index: c/cstddef
===================================================================
--- c/cstddef   (revision 233581)
+++ c/cstddef   (working copy)
@@ -31,10 +31,11 @@

 #pragma GCC system_header

-#define __need_size_t
-#define __need_ptrdiff_t
-#define __need_NULL
-#define __need_offsetof
+#undef __need_wchar_t
+#undef __need_size_t
+#undef __need_ptrdiff_t
+#undef __need_NULL
+#undef __need_wint_t
 #include_next <stddef.h>

 #endif
Index: c_global/cstddef
===================================================================
--- c_global/cstddef    (revision 233581)
+++ c_global/cstddef    (working copy)
@@ -41,6 +41,11 @@

 #pragma GCC system_header

+#undef __need_wchar_t
+#undef __need_size_t
+#undef __need_ptrdiff_t
+#undef __need_NULL
+#undef __need_wint_t
 #include <bits/c++config.h>
 #include <stddef.h>

Index: c_std/cstddef
===================================================================
--- c_std/cstddef       (revision 233581)
+++ c_std/cstddef       (working copy)
@@ -41,6 +41,11 @@

 #pragma GCC system_header

+#undef __need_wchar_t
+#undef __need_size_t
+#undef __need_ptrdiff_t
+#undef __need_NULL
+#undef __need_wint_t
 #include <bits/c++config.h>
 #include <stddef.h>