https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85850
--- Comment #3 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Indeed, Janne is correct, this change in libcpp/system.h solves the problem,
i.e. moving the <new> definition up:
# diff -u system.h system.h.260425
--- system.h 2018-05-20 23:00:01.000000000 +0200
+++ system.h.260425 2018-05-20 22:55:27.000000000 +0200
@@ -370,10 +370,6 @@
#include "libiberty.h"
#include "safe-ctype.h"
-#ifdef __cplusplus
-#include <new>
-#endif
-
/* 1 if we have C99 designated initializers.
??? C99 designated initializers are not supported by most C++
@@ -442,6 +438,10 @@
/* Some compilers do not allow the use of unsigned char in bitfields. */
#define BOOL_BITFIELD unsigned int
+#ifdef __cplusplus
+#include <new>
+#endif
+
/* Poison identifiers we do not want to use. */
#if (GCC_VERSION >= 3000)
#undef calloc
