/* Test for handling of tags (6.7.2.3). */ /* Origin: Joseph Myers */ /* { dg-do compile } */ /* { dg-options "-std=iso9899:1999 -pedantic-errors" } */ void foo (void) { /* Forward declarations of structs and unions are OK; those of enums are not. */ { struct s0; struct s1 *x0; union u0; union u1 *x1; enum e0; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "forward" "enum forward 1" { target *-*-* } 16 } */ enum e1 *x2; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "forward" "enum forward 2" { target *-*-* } 18 } */ /* GCC used to fail to diagnose a use of an enum inside its definition. */ enum e2 { E2A = sizeof (enum e2 *) }; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "forward" "enum forward 3" { target *-*-* } 21 } */ } /* A specific type shall have its content defined at most once. But we may redeclare the tag in different scopes. */ { struct s0 { int i; }; /* { dg-message "note: originally defined here" } */ { struct s0 { long l; }; } { union s0 { long l; }; } struct s0 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "rede" "struct redef" { target *-*-* } 34 } */ union u0 { int i; }; /* { dg-message "note: originally defined here" } */ { union u0 { long l; }; } { struct u0 { long l; }; } union u0 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "rede" "union redef" { target *-*-* } 43 } */ enum e0 { E0A }; /* { dg-message "note: originally defined here" } */ { enum e0 { E0B }; } { struct e0 { long l; }; } enum e0 { E0B }; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "rede" "enum redef" { target *-*-* } 52 } */ } /* Structure, union and enumerated types have a single namespace of tags. */ { struct s0; struct s1; struct s2 { int i; }; struct s2; struct s3 { int i; }; struct s2 sv; union u0; union u2 { int i; }; union u2; union u2 uv; enum e0 { E0A }; enum e1 { E1A }; /* None of the following are allowed; some were not detected by GCC. */ union s0; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 70 } */ union s1 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 72 } */ union s2; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 74 } */ union s3 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 76 } */ enum u0 { U0A }; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 78 } */ enum u2 { U2A }; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 80 } */ struct e0; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 82 } */ struct e1 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 84 } */ } /* Explicit shadowing in inner scopes is OK, but references to the tag that don't explicitly shadow it must (whether in declarations or expressions) use the correct one of struct/union/enum. */ { struct s0; struct s1; struct s2 { int i; }; struct s2; struct s3 { int i; }; struct s2 sv; union u0; union u2 { int i; }; union u2; union u2 uv; enum e0 { E0A }; enum e1 { E1A }; { union s0; union s1; union s2; union s3; struct u0; struct u2; struct e0; union e1; } { union s0 *x0; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 114 } */ int x1[sizeof (union s1 *)]; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 116 } */ struct t; union s2 *x2; /* { dg-error "wrong" "wrong tag type" { target *-*-* } 119 } */ int x3[sizeof (union s3 *)]; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 121 } */ struct u; enum u0 *y0; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong|forward" "wrong tag type" { target *-*-* } 124 } */ int y1[sizeof (enum u2 *)]; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong|forward" "wrong tag type" { target *-*-* } 126 } */ struct v; struct e0 *z0; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 129 } */ int z1[sizeof (struct e1 *)]; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 131 } */ struct w; } /* When explicitly shadowed to be a tag of a different type, references to the new type of tag must be accepted and those to the old type rejected. */ { union s0; union s0 *x0; union s1; struct s1 *x1; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 142 } */ union s2; union s2 *x2; union s3; struct s3 *x3; /* { dg-bogus "warning" "warning in place of error" } */ /* { dg-error "wrong" "wrong tag type" { target *-*-* } 147 } */ } } }