--- gcc-master.orig/gcc/cp/g++spec.c	2020-06-30 19:04:27.559302683 +0100
+++ gcc-master/gcc/cp/g++spec.c	2020-06-30 19:05:12.295059825 +0100
@@ -403,3 +403,9 @@
 
 /* Number of extra output files that lang_specific_pre_link may generate.  */
 int lang_specific_extra_outfiles = 0;  /* Not used for C++.  */
+
+/* lang_register_spec_functions.  Not used for C++.  */
+void
+lang_register_spec_functions (void)
+{
+}
