3 extern "C" auto int a; // { dg-error "linkage|two or more data types" }
4 extern "C" register int b; // { dg-error "linkage" }
5 extern "C" static void c(); // { dg-error "linkage" }
6 extern "C" extern void d(); // { dg-error "linkage" }
7 extern "C" mutable int e; // { dg-error "linkage" }