--- gcc-versionno-orig/gcc/c-family/cppspec.c	2018-04-13 16:08:36.070820977 +0100
+++ gcc-versionno/gcc/c-family/cppspec.c	2018-04-14 01:29:42.469961191 +0100
@@ -197,3 +197,9 @@
 
 /* Number of extra output files that lang_specific_pre_link may generate.  */
 int lang_specific_extra_outfiles = 0;  /* Not used for cpp.  */
+
+/* lang_register_spec_functions.  Not used for cpp.  */
+void
+lang_register_spec_functions (void)
+{
+}
