--- gcc-master.orig/gcc/c-family/cppspec.c	2020-06-30 19:04:27.127305030 +0100
+++ gcc-master/gcc/c-family/cppspec.c	2020-06-30 19:05:11.895061996 +0100
@@ -198,3 +198,9 @@
 
 /* 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)
+{
+}
