clang/test/Modules/cxx20-10-2-ex6.cpp

   1 // Based on C++20 10.2 example 6.
   2
   3 // RUN: %clang_cc1 -std=c++20 -emit-module-interface %s -verify -o %t
   4
   5 export module M;
   6
   7 static int f();  // expected-note {{previous declaration is here}} #1
   8                  // error: #1 gives internal linkage
   9 export int f();  // expected-error {{cannot export redeclaration 'f' here since the previous declaration has internal linkage}}
  10 struct S;        // expected-note {{previous declaration is here}} #2
  11                  // error: #2 gives module linkage
  12 export struct S; // expected-error {{cannot export redeclaration 'S' here since the previous declaration has module linkage}}
  13
  14 namespace {
  15 namespace N {
  16 extern int x; // expected-note {{previous declaration is here}} #3
  17 }
  18 } // namespace
  19   // error: #3 gives internal linkage
  20 export int N::x; // expected-error {{cannot export redeclaration 'x' here since the previous declaration has internal linkage}}
  21                  // expected-error@-1 {{declaration of 'x' with internal linkage cannot be exported}}