clang/test/Sema/gnu-flags.c

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s -DNONE -Wno-gnu
   2 // RUN: %clang_cc1 -fsyntax-only -verify %s -DALL -Wgnu
   3 // RUN: %clang_cc1 -fsyntax-only -verify %s -DALL -Wno-gnu \
   4 // RUN:   -Wgnu-alignof-expression -Wgnu-complex-integer -Wgnu-conditional-omitted-operand \
   5 // RUN:   -Wgnu-label-as-value -Wgnu-statement-expression \
   6 // RUN:   -Wgnu-compound-literal-initializer -Wgnu-flexible-array-initializer \
   7 // RUN:   -Wgnu-redeclared-enum  -Wgnu-folding-constant -Wgnu-empty-struct \
   8 // RUN:   -Wgnu-union-cast -Wgnu-variable-sized-type-not-at-end
   9 // RUN: %clang_cc1 -fsyntax-only -verify %s -DNONE -Wgnu \
  10 // RUN:   -Wno-gnu-alignof-expression -Wno-gnu-complex-integer -Wno-gnu-conditional-omitted-operand \
  11 // RUN:   -Wno-gnu-label-as-value -Wno-gnu-statement-expression \
  12 // RUN:   -Wno-gnu-compound-literal-initializer -Wno-gnu-flexible-array-initializer \
  13 // RUN:   -Wno-gnu-redeclared-enum -Wno-gnu-folding-constant -Wno-gnu-empty-struct \
  14 // RUN:   -Wno-gnu-union-cast -Wno-gnu-variable-sized-type-not-at-end
  15 // Additional disabled tests:
  16 // %clang_cc1 -fsyntax-only -verify %s -DALIGNOF -Wno-gnu -Wgnu-alignof-expression
  17 // %clang_cc1 -fsyntax-only -verify %s -DCOMPLEXINT -Wno-gnu -Wgnu-complex-integer
  18 // %clang_cc1 -fsyntax-only -verify %s -DOMITTEDOPERAND -Wno-gnu -Wgnu-conditional-omitted-operand
  19 // %clang_cc1 -fsyntax-only -verify %s -DLABELVALUE -Wno-gnu -Wgnu-label-as-value
  20 // %clang_cc1 -fsyntax-only -verify %s -DSTATEMENTEXP -Wno-gnu -Wgnu-statement-expression
  21 // %clang_cc1 -fsyntax-only -verify %s -DSTATEMENTEXPMACRO -Wno-gnu -Wgnu-statement-expression-from-macro-expansion
  22 // %clang_cc1 -fsyntax-only -verify %s -DCOMPOUNDLITERALINITIALIZER -Wno-gnu -Wgnu-compound-literal-initializer
  23 // %clang_cc1 -fsyntax-only -verify %s -DFLEXIBLEARRAYINITIALIZER -Wno-gnu -Wgnu-flexible-array-initializer
  24 // %clang_cc1 -fsyntax-only -verify %s -DREDECLAREDENUM -Wno-gnu -Wgnu-redeclared-enum
  25 // %clang_cc1 -fsyntax-only -verify %s -DUNIONCAST -Wno-gnu -Wgnu-union-cast
  26 // %clang_cc1 -fsyntax-only -verify %s -DVARIABLESIZEDTYPENOTATEND -Wno-gnu -Wgnu-variable-sized-type-not-at-end
  27 // %clang_cc1 -fsyntax-only -verify %s -DFOLDINGCONSTANT -Wno-gnu -Wgnu-folding-constant
  28 // %clang_cc1 -fsyntax-only -verify %s -DEMPTYSTRUCT -Wno-gnu -Wgnu-empty-struct
  29
  30 #if NONE
  31 // expected-no-diagnostics
  32 #endif
  33
  34
  35 #if ALL || ALIGNOF
  36 // expected-warning@+4 {{'_Alignof' applied to an expression is a GNU extension}}
  37 #endif
  38
  39 char align;
  40 _Static_assert(_Alignof(align) > 0, "align's alignment is wrong");
  41
  42
  43 #if ALL || COMPLEXINT
  44 // expected-warning@+3 {{complex integer types are a GNU extension}}
  45 #endif
  46
  47 _Complex short int complexint;
  48
  49
  50 #if ALL || OMITTEDOPERAND
  51 // expected-warning@+3 {{use of GNU ?: conditional expression extension, omitting middle operand}}
  52 #endif
  53
  54 static const char* omittedoperand = (const char*)0 ?: "Null";
  55
  56
  57 #if ALL || LABELVALUE
  58 // expected-warning@+6 {{use of GNU address-of-label extension}}
  59 // expected-warning@+7 {{use of GNU indirect-goto extension}}
  60 #endif
  61
  62 void labelvalue(void) {
  63         void *ptr;
  64         ptr = &&foo;
  65 foo:
  66         goto *ptr;
  67 }
  68
  69
  70 #if ALL || STATEMENTEXP
  71 // expected-warning@+5 {{use of GNU statement expression extension}}
  72 #endif
  73
  74 void statementexp(void)
  75 {
  76         int a = ({ 1; });
  77 }
  78
  79 #if ALL || STATEMENTEXP || STATEMENTEXPMACRO
  80 // expected-warning@+5 {{use of GNU statement expression extension from macro expansion}}
  81 #endif
  82
  83 #define STMT_EXPR_MACRO(a) ({ (a); })
  84 void statementexprmacro(void) {
  85   int a = STMT_EXPR_MACRO(1);
  86 }
  87
  88 #if ALL || COMPOUNDLITERALINITIALIZER
  89 // expected-warning@+4 {{initialization of an array of type 'int[5]' from a compound literal of type 'int[5]' is a GNU extension}}
  90 #endif
  91
  92 typedef int int5[5];
  93 int cli[5] = (int[]){1, 2, 3, 4, 5};
  94
  95
  96 #if ALL || FLEXIBLEARRAYINITIALIZER
  97 // expected-note@+6 {{initialized flexible array member 'y' is here}}
  98 // expected-warning@+6 {{flexible array initialization is a GNU extension}}
  99 #endif
 100
 101 struct fai {
 102   int x;
 103   int y[];
 104 } fai = { 1, { 2, 3, 4 } };
 105
 106
 107 #if ALL || FOLDINGCONSTANT
 108 // expected-warning@+5 {{expression is not an integer constant expression; folding it to a constant is a GNU extension}}
 109 // expected-warning@+7 {{variable length array folded to constant array as an extension}}
 110 #endif
 111
 112 enum {
 113         fic = (int)(0.75 * 1000 * 1000)
 114 };
 115 static const int size = 100;
 116 int data[size];
 117
 118 void foo(void) { int data[size]; } // OK, always a VLA
 119
 120 #if ALL || REDECLAREDENUM
 121 // expected-note@+4 {{previous definition is here}}
 122 // expected-warning@+8 {{redeclaration of already-defined enum 'RE' is a GNU extension}}
 123 #endif
 124
 125 enum RE {
 126   Val1,
 127   Val2
 128 };
 129
 130 enum RE;
 131
 132
 133 #if ALL || UNIONCAST
 134 // expected-warning@+4 {{cast to union type is a GNU extension}}
 135 #endif
 136
 137 union uc { int i; unsigned : 3; };
 138 union uc w = (union uc)2;
 139
 140
 141 #if ALL || VARIABLESIZEDTYPENOTATEND
 142 // expected-warning@+8 {{field 'hdr' with variable sized type 'struct vst' not at the end of a struct or class is a GNU extension}}
 143 #endif
 144
 145 struct vst {
 146  short tag_type;
 147  char tag_data[];
 148 };
 149 struct vstnae {
 150   struct vst hdr;
 151   char data;
 152 };
 153
 154
 155 #if ALL || EMPTYSTRUCT
 156 // expected-warning@+4 {{empty struct is a GNU extension}}
 157 // expected-warning@+4 {{struct without named members is a GNU extension}}
 158 #endif
 159
 160 const struct {} es;
 161 struct {int:5;} swnm;
 162