clang/test/SemaCXX/_Alignas.cpp

   1 // RUN: %clang_cc1 %s -fsyntax-only -verify=expected,cpp
   2 // RUN: %clang_cc1 -x c %s -fsyntax-only -verify=expected,c
   3
   4 // Ensure that we correctly parse _Alignas as an extension in C++.
   5 _Alignas(64) int i1;
   6 _Alignas(long long) int i2;
   7 int volatile _Alignas(64) i3; // Test strange ordering
   8
   9 void foo(void) {
  10   // We previously rejected these valid declarations.
  11   _Alignas(8) char i4;
  12   _Alignas(char) char i5;
  13
  14   (void)(int _Alignas(64))0; // expected-warning {{'_Alignas' attribute ignored when parsing type}}
  15   // FIXME: C and C++ should both diagnose the same way, as being ignored.
  16   (void)(_Alignas(64) int)0; // c-error {{expected expression}} \
  17                                 cpp-warning {{'_Alignas' attribute ignored when parsing type}}
  18 }
  19
  20 struct S {
  21   _Alignas(int) int i;
  22   _Alignas(64) int j;
  23 };
  24
  25 void bar(_Alignas(8) char c1, char _Alignas(char) c2); // expected-error 2 {{'_Alignas' attribute cannot be applied to a function parameter}}