--- a/gcc/realmpfr.h	Sun Aug 21 07:07:55 2011 +0900
+++ b/gcc/realmpfr.h	Fri Oct 27 22:46:09 2017 +0900
@@ -1,7 +1,6 @@
 /* Definitions of floating-point conversion from compiler
    internal format to MPFR.
-   Copyright (C) 2010
-   Free Software Foundation, Inc.
+   Copyright (C) 2010-2017 Free Software Foundation, Inc.
 
    This file is part of GCC.
 
@@ -22,19 +21,21 @@
 #ifndef GCC_REALGMP_H
 #define GCC_REALGMP_H
 
-#include <gmp.h>
 #include <mpfr.h>
 #include <mpc.h>
-#include "real.h"
-
-/* In builtins.c.  */
-extern tree do_mpc_arg2 (tree, tree, tree, int, int (*)(mpc_ptr, mpc_srcptr, mpc_srcptr, mpc_rnd_t));
 
 /* Convert between MPFR and REAL_VALUE_TYPE.  The caller is
    responsible for initializing and clearing the MPFR parameter.  */
 
 extern void real_from_mpfr (REAL_VALUE_TYPE *, mpfr_srcptr, tree, mp_rnd_t);
+extern void real_from_mpfr (REAL_VALUE_TYPE *, mpfr_srcptr,
+			    const real_format *, mp_rnd_t);
 extern void mpfr_from_real (mpfr_ptr, const REAL_VALUE_TYPE *, mp_rnd_t);
 
+#if (GCC_VERSION >= 3000)
+  /* For compatibility with mpfr 2.4 and earlier, we want to only use
+     GMP_RND*.  */
+  #pragma GCC poison MPFR_RNDN MPFR_RNDZ MPFR_RNDU MPFR_RNDD
+#endif
+
 #endif /* ! GCC_REALGMP_H */
-