--- gcc-git/gcc/c-family/cppspec.c	2021-06-10 11:58:17.694982057 +0100
+++ gm2-floppsie/gcc/c-family/cppspec.c	2021-06-17 10:20:53.195400499 +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)
+{
+}
