1 // RUN: %clang_cc1 -fsyntax-only -verify=c23 -std=c23 %s -Wpre-c2x-compat 2 // RUN: %clang_cc1 -fsyntax-only -verify=c17 -std=c17 %s 3 4 constexpr int a = 0; // c17-error {{unknown type name 'constexpr'}} \ 5 c23-warning {{'constexpr' is incompatible with C standards before C23}} 6 7 void func(int array[constexpr]); // c23-error {{expected expression}} \ 8 // c17-error {{use of undeclared}} 9 10 _Atomic constexpr int b = 0; // c23-error {{constexpr variable cannot have type 'const _Atomic(int)'}} \ 11 // c23-warning {{'constexpr' is incompatible with C standards before C23}} \ 12 // c17-error {{unknown type name 'constexpr'}} 13 14 int static constexpr c = 1; // c17-error {{expected ';' after top level declarator}} \ 15 // c23-warning {{'constexpr' is incompatible with C standards before C23}} 16