clang/test/SemaCXX/attr-cxx0x.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -fcxx-exceptions -verify -pedantic -std=c++11 %s
   2
   3 int align_illegal alignas(3); //expected-error {{requested alignment is not a power of 2}}
   4 char align_big alignas(int);
   5 int align_small alignas(1); // expected-error {{requested alignment is less than minimum}}
   6 int align_multiple alignas(1) alignas(8) alignas(1);
   7 alignas(4) int align_before;
   8
   9 struct align_member {
  10   int member alignas(8);
  11   int bitfield alignas(1) : 1; // expected-error {{}}
  12 };
  13
  14 void f(alignas(1) char c) { // expected-error {{'alignas' attribute cannot be applied to a function parameter}}
  15   alignas(1) register char k; // expected-error {{'alignas' attribute cannot be applied to a variable with 'register' storage class}} expected-warning {{deprecated}}
  16   try {
  17   } catch (alignas(4) int n) { // expected-error {{'alignas' attribute cannot be applied to a 'catch' variable}}
  18   }
  19 }
  20
  21
  22 template <unsigned A> struct alignas(A) align_class_template {};
  23
  24 template <typename... T> struct alignas(T...) align_class_temp_pack_type {};
  25 template <unsigned... A> struct alignas(A...) align_class_temp_pack_expr {};
  26 struct alignas(int...) alignas_expansion_no_packs {}; // expected-error {{pack expansion does not contain any unexpanded parameter packs}}
  27 template <typename... A> struct outer {
  28   template <typename... B> struct alignas(alignof(A) * alignof(B)...) inner {};
  29   // expected-error@-1 {{pack expansion contains parameter packs 'A' and 'B' that have different lengths (1 vs. 2)}}
  30 };
  31 outer<int>::inner<short, double> mismatched_packs; // expected-note {{in instantiation of}}
  32
  33 typedef char align_typedef alignas(8); // expected-error {{'alignas' attribute only applies to variables, data members and tag types}}
  34 template<typename T> using align_alias_template = align_typedef alignas(8); // expected-error {{'alignas' attribute cannot be applied to types}}
  35
  36 static_assert(alignof(align_big) == alignof(int), "k's alignment is wrong"); // expected-warning{{'alignof' applied to an expression is a GNU extension}}
  37 static_assert(alignof(align_small) == 1, "j's alignment is wrong"); // expected-warning{{'alignof' applied to an expression is a GNU extension}}
  38 static_assert(alignof(align_multiple) == 8, "l's alignment is wrong"); // expected-warning{{'alignof' applied to an expression is a GNU extension}}
  39 static_assert(alignof(align_member) == 8, "quuux's alignment is wrong");
  40 static_assert(sizeof(align_member) == 8, "quuux's size is wrong");
  41 static_assert(alignof(align_class_template<8>) == 8, "template's alignment is wrong");
  42 static_assert(alignof(align_class_template<16>) == 16, "template's alignment is wrong");
  43 static_assert(alignof(align_class_temp_pack_type<short, int, long>) == alignof(long), "template's alignment is wrong");
  44 static_assert(alignof(align_class_temp_pack_expr<8, 16, 32>) == 32, "template's alignment is wrong");
  45 static_assert(alignof(outer<int,char>::inner<double,short>) == alignof(int) * alignof(double), "template's alignment is wrong");
  46
  47 static_assert(alignof(int(int)) >= 1, "alignof(function) not positive"); // expected-error{{invalid application of 'alignof' to a function type}}
  48
  49 [[__carries_dependency__]]
  50 void func(void);
  51
  52 alignas(4) auto PR19252 = 0;
  53
  54 // Check the diagnostic message
  55 class alignas(void) AlignasVoid {}; // expected-error {{invalid application of 'alignas' to an incomplete type 'void'}}