clang/test/Sema/c2x-noreturn.c

   1 // RUN: %clang_cc1 -verify=all,c2x -std=c2x -fsyntax-only %s
   2 // RUN: %clang_cc1 -verify=all -std=c17 -fdouble-square-bracket-attributes -fsyntax-only %s
   3 // RUN: %clang_cc1 -verify=none -Wno-deprecated-attributes -D_CLANG_DISABLE_CRT_DEPRECATION_WARNINGS -std=c2x -fsyntax-only %s
   4 // RUN: %clang_cc1 -verify=none -Wno-deprecated-attributes -D_CLANG_DISABLE_CRT_DEPRECATION_WARNINGS -std=c17 -fdouble-square-bracket-attributes -fsyntax-only %s
   5 // none-no-diagnostics
   6
   7 // Test preprocessor functionality.
   8 #if !__has_c_attribute(noreturn)
   9 #error "No noreturn attribute support?"
  10 #endif
  11
  12 #if !__has_c_attribute(_Noreturn)
  13 #error "No _Noreturn attribute support?"
  14 #endif
  15
  16 #if __has_c_attribute(noreturn) != __has_c_attribute(_Noreturn) || \
  17     __has_c_attribute(noreturn) != 202202L
  18 #error "Wrong value for __has_c_attribute(noreturn)"
  19 #endif
  20
  21 // If we're testings with deprecations disabled, we don't care about testing
  22 // the scenarios that trigger errors because we're only interested in the
  23 // deprecation warning behaviors.
  24 #ifndef _CLANG_DISABLE_CRT_DEPRECATION_WARNINGS
  25 // Test that the attribute accepts no args, applies to the correct subject, etc.
  26 [[noreturn(12)]] void func4(void); // all-error {{attribute 'noreturn' cannot have an argument list}}
  27 [[noreturn]] int not_a_func; // all-error {{'noreturn' attribute only applies to functions}}
  28 void func5(void) [[noreturn]]; // all-error {{'noreturn' attribute cannot be applied to types}}
  29 #endif
  30
  31 _Noreturn void func1(void); // ok, using the function specifier
  32 [[noreturn]] void func2(void);
  33
  34 // This is deprecated because it's only for compatibility with inclusion of the
  35 // <stdnoreturn.h> header where the noreturn macro expands to _Noreturn.
  36 [[_Noreturn]] void func3(void); // all-warning {{the '[[_Noreturn]]' attribute spelling is deprecated in C2x; use '[[noreturn]]' instead}}
  37
  38 // Test the behavior of including <stdnoreturn.h>
  39 #include <stdnoreturn.h>
  40
  41 [[noreturn]] void func6(void);
  42
  43 void func7 [[noreturn]] (void);
  44
  45 noreturn void func8(void);
  46
  47 // Ensure the function specifier form still works.
  48 void noreturn func9(void);
  49
  50 // Ensure that spelling the deprecated form of the attribute is still diagnosed.
  51 [[_Noreturn]] void func10(void); // all-warning {{the '[[_Noreturn]]' attribute spelling is deprecated in C2x; use '[[noreturn]]' instead}}
  52
  53 // Test preprocessor functionality after including <stdnoreturn.h>.
  54 #if !__has_c_attribute(noreturn)
  55 #error "No noreturn attribute support?"
  56 #endif
  57
  58 #if !__has_c_attribute(_Noreturn)
  59 #error "No _Noreturn attribute support?"
  60 #endif
  61
  62 // Test that a macro which expands to _Noreturn is still diagnosed when it
  63 // doesn't come from a system header.
  64 #define NORETURN _Noreturn
  65 [[NORETURN]] void func11(void); // all-warning {{the '[[_Noreturn]]' attribute spelling is deprecated in C2x; use '[[noreturn]]' instead}}