--- a/gcc/config/sparc/sp-elf.h	Fri Oct 27 22:46:09 2017 +0900
+++ b/gcc/config/sparc/sp-elf.h	Thu Oct 25 07:37:49 2018 +0900
@@ -1,6 +1,6 @@
 /* Definitions of target machine for GCC,
    for SPARC running in an embedded environment using the ELF file format.
-   Copyright (C) 2005-2017 Free Software Foundation, Inc.
+   Copyright (C) 2005-2018 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -18,9 +18,6 @@
 along with GCC; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */
 
-/* Don't assume anything about the header files.  */
-#define NO_IMPLICIT_EXTERN_C
-
 /* It's safe to pass -s always, even if -g is not used.  */
 #undef ASM_SPEC
 #define ASM_SPEC \