clang/test/Parser/cxx-attributes.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2
   3 // GH#58229 - rejects-valid
   4 __attribute__((__visibility__("default"))) [[nodiscard]] int f();
   5 [[nodiscard]] __attribute__((__visibility__("default"))) int f();
   6 extern "C" __attribute__((__visibility__("default"))) [[nodiscard]]
   7 int g() { return 32; }
   8
   9 class c {
  10   virtual void f1(const char* a, ...)
  11     __attribute__ (( __format__(__printf__,2,3) )) = 0;
  12   virtual void f2(const char* a, ...)
  13     __attribute__ (( __format__(__printf__,2,3) )) {}
  14 };
  15
  16 template <typename T> class X {
  17   template <typename S> void X<S>::f() __attribute__((locks_excluded())); // expected-error{{nested name specifier 'X<S>::' for declaration does not refer into a class, class template or class template partial specialization}} \
  18                                                                           // expected-warning{{attribute locks_excluded ignored, because it is not attached to a declaration}}
  19 };
  20
  21 namespace PR17666 {
  22   const int A = 1;
  23   typedef int __attribute__((__aligned__(A))) T1;
  24   int check1[__alignof__(T1) == 1 ? 1 : -1];
  25
  26   typedef int __attribute__((aligned(int(1)))) T1;
  27   typedef int __attribute__((aligned(int))) T2; // expected-error {{expected '(' for function-style cast}}
  28 }
  29
  30 __attribute((typename)) int x; // expected-warning {{unknown attribute 'typename' ignored}}
  31
  32 void fn() {
  33   void (*__attribute__((attr)) fn_ptr)() = &fn; // expected-warning{{unknown attribute 'attr' ignored}}
  34   void (*__attribute__((attrA)) *__attribute__((attrB)) fn_ptr_ptr)() = &fn_ptr; // expected-warning{{unknown attribute 'attrA' ignored}} expected-warning{{unknown attribute 'attrB' ignored}}
  35
  36   void (&__attribute__((attr)) fn_lref)() = fn; // expected-warning{{unknown attribute 'attr' ignored}}
  37   void (&&__attribute__((attr)) fn_rref)() = fn; // expected-warning{{unknown attribute 'attr' ignored}}
  38
  39   int i[5];
  40   int (*__attribute__((attr(i[1]))) pi);  // expected-warning{{unknown attribute 'attr' ignored}}
  41   pi = &i[0];
  42 }
  43
  44 [[deprecated([""])]] int WrongArgs; // expected-error {{expected string literal as argument of 'deprecated' attribute}}
  45 [[,,,,,]] int Commas1; // ok
  46 [[,, maybe_unused]] int Commas2; // ok
  47 [[maybe_unused,,,]] int Commas3; // ok
  48 [[,,maybe_unused,]] int Commas4; // ok
  49 [[foo bar]] int NoComma; // expected-error {{expected ','}} \
  50                          // expected-warning {{unknown attribute 'foo' ignored}}
  51 // expected-error@+2 2 {{expected ']'}}
  52 // expected-error@+1 {{expected external declaration}}
  53 [[foo