clang/test/Sema/static-assert.c

   1 // RUN: %clang_cc1 -std=c11 -Wgnu-folding-constant -fsyntax-only -verify %s
   2 // RUN: %clang_cc1 -fms-compatibility -Wgnu-folding-constant -DMS -fsyntax-only -verify=expected,ms %s
   3 // RUN: %clang_cc1 -std=c99 -pedantic -Wgnu-folding-constant -fsyntax-only -verify=expected,ext %s
   4 // RUN: %clang_cc1 -xc++ -std=c++11 -pedantic -fsyntax-only -verify=expected,ext,cxx %s
   5
   6 _Static_assert("foo", "string is nonzero"); // ext-warning {{'_Static_assert' is a C11 extension}}
   7 #ifndef __cplusplus
   8 // expected-warning@-2 {{expression is not an integer constant expression; folding it to a constant is a GNU extension}}
   9 #endif
  10
  11 _Static_assert(1, "1 is nonzero"); // ext-warning {{'_Static_assert' is a C11 extension}}
  12 _Static_assert(0, "0 is nonzero"); // expected-error {{static assertion failed: 0 is nonzero}} \
  13                                    // ext-warning {{'_Static_assert' is a C11 extension}}
  14
  15 #ifdef MS
  16 static_assert(1, "1 is nonzero"); // ms-warning {{use of 'static_assert' without inclusion of <assert.h> is a Microsoft extension}}
  17 #endif
  18
  19 void foo(void) {
  20   _Static_assert(1, "1 is nonzero"); // ext-warning {{'_Static_assert' is a C11 extension}}
  21   _Static_assert(0, "0 is nonzero"); // expected-error {{static assertion failed: 0 is nonzero}} \
  22                                      // ext-warning {{'_Static_assert' is a C11 extension}}
  23 #ifdef MS
  24   static_assert(1, "1 is nonzero"); // ms-warning {{use of 'static_assert' without}}
  25 #endif
  26 }
  27
  28 _Static_assert(1, invalid); // expected-error {{expected string literal for diagnostic message in static_assert}} \
  29                             // ext-warning {{'_Static_assert' is a C11 extension}}
  30
  31 struct A {
  32   int a;
  33   _Static_assert(1, "1 is nonzero"); // ext-warning {{'_Static_assert' is a C11 extension}}
  34   _Static_assert(0, "0 is nonzero"); // expected-error {{static assertion failed: 0 is nonzero}} \
  35                                      // ext-warning {{'_Static_assert' is a C11 extension}}
  36 #ifdef MS
  37   static_assert(1, "1 is nonzero"); // ms-warning {{use of 'static_assert' without}}
  38 #endif
  39 };
  40
  41 #ifdef __cplusplus
  42 #define ASSERT_IS_TYPE(T) __is_same(T, T)
  43 #else
  44 #define ASSERT_IS_TYPE(T) __builtin_types_compatible_p(T, T)
  45 #endif
  46
  47 #define UNION(T1, T2) union { \
  48     __typeof__(T1) one; \
  49     __typeof__(T2) two; \
  50     _Static_assert(ASSERT_IS_TYPE(T1), "T1 is not a type"); \
  51     _Static_assert(ASSERT_IS_TYPE(T2), "T2 is not a type"); \
  52     _Static_assert(sizeof(T1) == sizeof(T2), "type size mismatch"); \
  53   }
  54
  55 typedef UNION(unsigned, struct A) U1; // ext-warning 3 {{'_Static_assert' is a C11 extension}}
  56 UNION(char[2], short) u2 = { .one = { 'a', 'b' } }; // ext-warning 3 {{'_Static_assert' is a C11 extension}} cxx-warning {{designated initializers are a C++20 extension}}
  57 typedef UNION(char, short) U3; // expected-error {{static assertion failed due to requirement 'sizeof(char) == sizeof(short)': type size mismatch}} \
  58                                // expected-note{{evaluates to '1 == 2'}} \
  59                                // ext-warning 3 {{'_Static_assert' is a C11 extension}}
  60 typedef UNION(float, 0.5f) U4; // expected-error {{expected a type}} \
  61                                // ext-warning 3 {{'_Static_assert' is a C11 extension}}
  62
  63 // After defining the assert macro in MS-compatibility mode, we should
  64 // no longer warn about including <assert.h> under the assumption the
  65 // user already did that.
  66 #ifdef MS
  67 #define assert(expr)
  68 static_assert(1, "1 is nonzero"); // ok
  69
  70 // But we should still warn if the user did something bonkers.
  71 #undef static_assert
  72 static_assert(1, "1 is nonzero"); // ms-warning {{use of 'static_assert' without}}
  73 #endif
  74
  75 _Static_assert(1 , "") // expected-error {{expected ';' after '_Static_assert'}} \
  76                       // ext-warning {{'_Static_assert' is a C11 extension}}
  77
  78 static int static_var;
  79 _Static_assert(&static_var != 0, "");  // ext-warning {{'_Static_assert' is a C11 extension}} \
  80                                        // expected-warning {{comparison of address of 'static_var' not equal to a null pointer is always true}}
  81 _Static_assert("" != 0, "");           // ext-warning {{'_Static_assert' is a C11 extension}}
  82 _Static_assert(("" != 0), "");         // ext-warning {{'_Static_assert' is a C11 extension}}
  83 _Static_assert(*"1", "");              // ext-warning {{'_Static_assert' is a C11 extension}}
  84 _Static_assert("1"[0], "");            // ext-warning {{'_Static_assert' is a C11 extension}}
  85 _Static_assert(1.0 != 0, "");          // ext-warning {{'_Static_assert' is a C11 extension}}
  86 _Static_assert(__builtin_strlen("1"), "");  // ext-warning {{'_Static_assert' is a C11 extension}}
  87 #ifndef __cplusplus
  88 // expected-warning@-9 {{expression is not an integer constant expression; folding it to a constant is a GNU extension}}
  89 // expected-warning@-8 {{expression is not an integer constant expression; folding it to a constant is a GNU extension}}
  90 // expected-warning@-8 {{expression is not an integer constant expression; folding it to a constant is a GNU extension}}
  91 // expected-warning@-8 {{expression is not an integer constant expression; folding it to a constant is a GNU extension}}
  92 // expected-warning@-8 {{expression is not an integer constant expression; folding it to a constant is a GNU extension}}
  93 // expected-warning@-8 {{expression is not an integer constant expression; folding it to a constant is a GNU extension}}
  94 // __builtin_strlen(literal) is considered an integer constant expression
  95 // and doesn't cause a pedantic warning
  96 #endif