--- clang-14.log	2022-11-02 22:36:15.746754990 +1100
+++ clang-15.log	2022-11-02 22:36:15.747754986 +1100
@@ -1,8 +1,8 @@
-comptest118.c:3:24: warning: call to undeclared library function 'strrchr' with type 'char *(const char *, int)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
+comptest118.c:3:24: error: call to undeclared library function 'strrchr' with type 'char *(const char *, int)'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
 int main() { char *x = strrchr("test", 'e'); if (x == NULL) return 0; else return 1; }
                        ^
 comptest118.c:3:24: note: include the header <string.h> or explicitly provide a declaration for 'strrchr'
-comptest118.c:3:24: warning: call to undeclared library function 'strrchr' with type 'char *(const char *, int)'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
+comptest118.c:3:24: error: call to undeclared library function 'strrchr' with type 'char *(const char *, int)'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration]
 int main() { char *x = strrchr("test", 'e'); if (x == NULL) return 0; else return 1; }
                        ^
 comptest118.c:3:24: note: include the header <string.h> or explicitly provide a declaration for 'strrchr'