| // RUN: %clang_cc1 -std=c11 -fsyntax-only -Wno-strict-prototypes -Wno-implicit-function-declaration -verify %s |
| // RUN: %clang_cc1 -std=c99 -pedantic -fsyntax-only -Wno-strict-prototypes -Wno-implicit-function-declaration -verify=expected,ext %s |
| |
| void g(void); |
| |
| void foo(int n) { |
| (void) _Generic(0, // ext-warning {{'_Generic' is a C11 extension}} |
| struct A: 0, // expected-error {{type 'struct A' in generic association incomplete}} |
| void(): 0, // expected-error {{type 'void ()' in generic association not an object type}} |
| int[n]: 0); // expected-error {{type 'int[n]' in generic association is a variably modified type}} |
| |
| (void) _Generic(0, // ext-warning {{'_Generic' is a C11 extension}} |
| void (*)(): 0, // expected-note {{compatible type 'void (*)()' specified here}} |
| void (*)(void): 0); // expected-error {{type 'void (*)(void)' in generic association compatible with previously specified type 'void (*)()'}} |
| |
| (void) _Generic((void (*)()) 0, // expected-error {{controlling expression type 'void (*)()' compatible with 2 generic association types}} \ |
| // ext-warning {{'_Generic' is a C11 extension}} |
| void (*)(int): 0, // expected-note {{compatible type 'void (*)(int)' specified here}} |
| void (*)(void): 0); // expected-note {{compatible type 'void (*)(void)' specified here}} |
| |
| (void) _Generic(0, // expected-error {{controlling expression type 'int' not compatible with any generic association type}} \ |
| // ext-warning {{'_Generic' is a C11 extension}} |
| char: 0, short: 0, long: 0); |
| |
| int a1[_Generic(0, int: 1, short: 2, float: 3, default: 4) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}} |
| int a2[_Generic(0, default: 1, short: 2, float: 3, int: 4) == 4 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}} |
| int a3[_Generic(0L, int: 1, short: 2, float: 3, default: 4) == 4 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}} |
| int a4[_Generic(0L, default: 1, short: 2, float: 3, int: 4) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}} |
| int a5[_Generic(0, int: 1, short: 2, float: 3) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}} |
| int a6[_Generic(0, short: 1, float: 2, int: 3) == 3 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}} |
| |
| int a7[_Generic("test", char *: 1, default: 2) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}} |
| int a8[_Generic(g, void (*)(void): 1, default: 2) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}} |
| |
| const int i = 12; |
| int a9[_Generic(i, int: 1, default: 2) == 1 ? 1 : -1]; // ext-warning {{'_Generic' is a C11 extension}} |
| |
| // This is expected to not trigger any diagnostics because the controlling |
| // expression is not evaluated. |
| (void)_Generic(*(int *)0, int: 1); // ext-warning {{'_Generic' is a C11 extension}} |
| } |
| |
| int __attribute__((overloadable)) test (int); |
| double __attribute__((overloadable)) test (double); |
| char testc(char); |
| |
| void PR30201(void) { |
| _Generic(4, char:testc, default:test)(4); // ext-warning {{'_Generic' is a C11 extension}} |
| } |
| |
| void GH50227(void) { |
| // Previously, the controlling expression for the outer _Generic makes it |
| // result dependent, and testing whether that controlling expression has side |
| // effects would cause a crash. |
| _Generic( // ext-warning {{'_Generic' is a C11 extension}} |
| n( |
| _Generic(n++, int : 0) // expected-error {{cannot increment value of type 'int ()'}} ext-warning {{'_Generic' is a C11 extension}} |
| ), int : 0); |
| } |
| |
| struct Test { |
| int i; |
| }; |
| |
| void unreachable_associations(const int i, const struct Test t) { |
| _Static_assert( // ext-warning {{'_Static_assert' is a C11 extension}} |
| _Generic(i, // ext-warning {{'_Generic' is a C11 extension}} |
| const int : 1, // expected-warning {{due to lvalue conversion of the controlling expression, association of type 'const int' will never be selected because it is qualified}} |
| volatile int : 2, // expected-warning {{due to lvalue conversion of the controlling expression, association of type 'volatile int' will never be selected because it is qualified}} |
| int[12] : 3, // expected-warning {{due to lvalue conversion of the controlling expression, association of type 'int[12]' will never be selected because it is of array type}} |
| int : 4, |
| default : 5 |
| ) == 4, "we had better pick int!"); |
| _Static_assert( // ext-warning {{'_Static_assert' is a C11 extension}} |
| _Generic(t, // ext-warning {{'_Generic' is a C11 extension}} |
| struct Test : 1, |
| const struct Test : 2, // expected-warning {{due to lvalue conversion of the controlling expression, association of type 'const struct Test' will never be selected because it is qualified}} |
| default : 3 |
| ) == 1, "we had better pick struct Test, not const struct Test!"); // C-specific result |
| } |
| |
| void GH55562(void) { |
| // Ensure that you can still define a type within a generic selection |
| // association (despite it not being particularly useful). |
| (void)_Generic(1, struct S { int a; } : 0, default : 0); // ext-warning {{'_Generic' is a C11 extension}} |
| struct S s = { 0 }; |
| int i = s.a; |
| } |