1*aced81c0SMariya Podchishchaeva // RUN: %clang_cc1 -fsyntax-only -verify=c23 -std=c23 %s -Wpre-c2x-compat 2*aced81c0SMariya Podchishchaeva // RUN: %clang_cc1 -fsyntax-only -verify=c17 -std=c17 %s 3*aced81c0SMariya Podchishchaeva 4*aced81c0SMariya Podchishchaeva constexpr int a = 0; // c17-error {{unknown type name 'constexpr'}} \ 5*aced81c0SMariya Podchishchaeva c23-warning {{'constexpr' is incompatible with C standards before C23}} 6*aced81c0SMariya Podchishchaeva 7*aced81c0SMariya Podchishchaeva void func(int array[constexpr]); // c23-error {{expected expression}} \ 8*aced81c0SMariya Podchishchaeva // c17-error {{use of undeclared}} 9*aced81c0SMariya Podchishchaeva 10*aced81c0SMariya Podchishchaeva _Atomic constexpr int b = 0; // c23-error {{constexpr variable cannot have type 'const _Atomic(int)'}} \ 11*aced81c0SMariya Podchishchaeva // c23-warning {{'constexpr' is incompatible with C standards before C23}} \ 12*aced81c0SMariya Podchishchaeva // c17-error {{unknown type name 'constexpr'}} 13*aced81c0SMariya Podchishchaeva 14*aced81c0SMariya Podchishchaeva int static constexpr c = 1; // c17-error {{expected ';' after top level declarator}} \ 15*aced81c0SMariya Podchishchaeva // c23-warning {{'constexpr' is incompatible with C standards before C23}} 16