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111
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1 /* Test for handling of tags (6.7.2.3). */
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2 /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
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3 /* { dg-do compile } */
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4 /* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
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5
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6 void
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7 foo (void)
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8 {
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9 /* Forward declarations of structs and unions are OK; those of enums are
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10 not. */
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11 {
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12 struct s0;
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13 struct s1 *x0;
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14 union u0;
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15 union u1 *x1;
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16 enum e0; /* { dg-bogus "warning" "warning in place of error" } */
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17 /* { dg-error "forward" "enum forward 1" { target *-*-* } .-1 } */
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18 enum e1 *x2; /* { dg-bogus "warning" "warning in place of error" } */
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19 /* { dg-error "forward" "enum forward 2" { target *-*-* } .-1 } */
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20 /* GCC used to fail to diagnose a use of an enum inside its definition. */
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21 enum e2 { E2A = sizeof (enum e2 *) }; /* { dg-bogus "warning" "warning in place of error" } */
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22 /* { dg-error "forward" "enum forward 3" { target *-*-* } .-1 } */
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23 }
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24 /* A specific type shall have its content defined at most once. But we
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25 may redeclare the tag in different scopes. */
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26 {
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27 struct s0 { int i; }; /* { dg-message "note: originally defined here" } */
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28 {
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29 struct s0 { long l; };
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30 }
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31 {
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32 union s0 { long l; };
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33 }
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34 struct s0 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */
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35 /* { dg-error "rede" "struct redef" { target *-*-* } .-1 } */
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36 union u0 { int i; }; /* { dg-message "note: originally defined here" } */
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37 {
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38 union u0 { long l; };
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39 }
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40 {
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41 struct u0 { long l; };
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42 }
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43 union u0 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */
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44 /* { dg-error "rede" "union redef" { target *-*-* } .-1 } */
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45 enum e0 { E0A }; /* { dg-message "note: originally defined here" } */
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46 {
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47 enum e0 { E0B };
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48 }
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49 {
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50 struct e0 { long l; };
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51 }
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52 enum e0 { E0B }; /* { dg-bogus "warning" "warning in place of error" } */
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53 /* { dg-error "rede" "enum redef" { target *-*-* } .-1 } */
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54 }
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55 /* Structure, union and enumerated types have a single namespace of tags. */
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56 {
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57 struct s0;
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58 struct s1;
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59 struct s2 { int i; };
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60 struct s2;
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61 struct s3 { int i; };
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62 struct s2 sv;
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63 union u0;
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64 union u2 { int i; };
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65 union u2;
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66 union u2 uv;
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67 enum e0 { E0A };
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68 enum e1 { E1A };
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69 /* None of the following are allowed; some were not detected by GCC. */
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70 union s0; /* { dg-bogus "warning" "warning in place of error" } */
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71 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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72 union s1 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */
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73 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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74 union s2; /* { dg-bogus "warning" "warning in place of error" } */
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75 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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76 union s3 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */
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77 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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78 enum u0 { U0A }; /* { dg-bogus "warning" "warning in place of error" } */
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79 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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80 enum u2 { U2A }; /* { dg-bogus "warning" "warning in place of error" } */
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81 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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82 struct e0; /* { dg-bogus "warning" "warning in place of error" } */
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83 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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84 struct e1 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */
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85 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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86 }
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87 /* Explicit shadowing in inner scopes is OK, but references to the tag
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88 that don't explicitly shadow it must (whether in declarations or
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89 expressions) use the correct one of struct/union/enum. */
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90 {
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91 struct s0;
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92 struct s1;
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93 struct s2 { int i; };
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94 struct s2;
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95 struct s3 { int i; };
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96 struct s2 sv;
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97 union u0;
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98 union u2 { int i; };
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99 union u2;
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100 union u2 uv;
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101 enum e0 { E0A };
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102 enum e1 { E1A };
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103 {
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104 union s0;
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105 union s1;
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106 union s2;
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107 union s3;
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108 struct u0;
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109 struct u2;
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110 struct e0;
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111 union e1;
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112 }
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113 {
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114 union s0 *x0; /* { dg-bogus "warning" "warning in place of error" } */
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115 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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116 int x1[sizeof (union s1 *)]; /* { dg-bogus "warning" "warning in place of error" } */
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117 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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118 struct t;
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119 union s2 *x2;
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120 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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121 int x3[sizeof (union s3 *)]; /* { dg-bogus "warning" "warning in place of error" } */
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122 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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123 struct u;
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124 enum u0 *y0; /* { dg-bogus "warning" "warning in place of error" } */
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125 /* { dg-error "wrong|forward" "wrong tag type" { target *-*-* } .-1 } */
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126 int y1[sizeof (enum u2 *)]; /* { dg-bogus "warning" "warning in place of error" } */
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127 /* { dg-error "wrong|forward" "wrong tag type" { target *-*-* } .-1 } */
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128 struct v;
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129 struct e0 *z0; /* { dg-bogus "warning" "warning in place of error" } */
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130 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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131 int z1[sizeof (struct e1 *)]; /* { dg-bogus "warning" "warning in place of error" } */
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132 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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133 struct w;
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134 }
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135 /* When explicitly shadowed to be a tag of a different type, references
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136 to the new type of tag must be accepted and those to the old type
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137 rejected. */
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138 {
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139 union s0;
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140 union s0 *x0;
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141 union s1;
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142 struct s1 *x1; /* { dg-bogus "warning" "warning in place of error" } */
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143 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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144 union s2;
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145 union s2 *x2;
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146 union s3;
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147 struct s3 *x3; /* { dg-bogus "warning" "warning in place of error" } */
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148 /* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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149 }
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150 }
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151 }
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