1 template <typename T> void specializable (T); 2 3 /* Invalid template: within "extern C". */ 4 5 extern "C" { // { dg-message "1: 'extern .C.' linkage started here" } 6 7 template <typename T> // { dg-error "template with C linkage" } 8 void within_extern_c_braces (void); 9 10 } 11 12 /* Valid template: not within "extern C". */ 13 14 template <typename T> 15 void not_within_extern_c (void); 16 17 18 /* Invalid specialization: within "extern C". */ 19 20 extern "C" { // { dg-message "1: 'extern .C.' linkage started here" } 21 22 template <> // { dg-error "template specialization with C linkage" } 23 void specializable (int); 24 25 } 26 27 28 /* Valid specialization: not within "extern C". */ 29 template <> 30 void specializable (char); 31 32 33 /* Example of extern C without braces. */ 34 35 extern "C" template <typename T> // { dg-line open_extern_c_no_braces } 36 void within_extern_c_no_braces (void); 37 // { dg-error "12: template with C linkage" "" { target *-*-* } open_extern_c_no_braces } 38 // { dg-message "1: 'extern .C.' linkage started here" "" { target *-*-* } open_extern_c_no_braces } 39 40 41 /* Nested extern "C" specifications. 42 We should report within the innermost extern "C" that's still open. */ 43 44 extern "C" { 45 extern "C" { // { dg-line middle_open_extern_c } 46 extern "C" { 47 } 48 49 template <typename T> // { dg-error "template with C linkage" } 50 void within_nested_extern_c (void); 51 // { dg-message "3: 'extern .C.' linkage started here" "" { target *-*-* } middle_open_extern_c } 52 53 extern "C++" { 54 /* Valid template: within extern "C++". */ 55 template <typename T> 56 void within_nested_extern_cpp (void); 57 58 extern "C" { // { dg-line last_open_extern_c } 59 /* Invalid template: within "extern C". */ 60 template <typename T> // { dg-error "template with C linkage" } 61 void within_extern_c_within_extern_cpp (void); 62 // { dg-message "7: 'extern .C.' linkage started here" "" { target *-*-* } last_open_extern_c } 63 } 64 } 65 } 66 } 67