152 lines
5.8 KiB
C
152 lines
5.8 KiB
C
/* Test for handling of tags (6.7.2.3). */
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/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
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/* { dg-do compile } */
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/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
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void
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foo (void)
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{
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/* Forward declarations of structs and unions are OK; those of enums are
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not. */
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{
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struct s0;
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struct s1 *x0;
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union u0;
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union u1 *x1;
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enum e0; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "forward" "enum forward 1" { target *-*-* } .-1 } */
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enum e1 *x2; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "forward" "enum forward 2" { target *-*-* } .-1 } */
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/* GCC used to fail to diagnose a use of an enum inside its definition. */
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enum e2 { E2A = sizeof (enum e2 *) }; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "forward" "enum forward 3" { target *-*-* } .-1 } */
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}
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/* A specific type shall have its content defined at most once. But we
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may redeclare the tag in different scopes. */
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{
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struct s0 { int i; }; /* { dg-message "note: originally defined here" } */
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{
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struct s0 { long l; };
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}
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{
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union s0 { long l; };
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}
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struct s0 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "rede" "struct redef" { target *-*-* } .-1 } */
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union u0 { int i; }; /* { dg-message "note: originally defined here" } */
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{
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union u0 { long l; };
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}
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{
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struct u0 { long l; };
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}
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union u0 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "rede" "union redef" { target *-*-* } .-1 } */
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enum e0 { E0A }; /* { dg-message "note: originally defined here" } */
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{
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enum e0 { E0B };
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}
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{
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struct e0 { long l; };
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}
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enum e0 { E0B }; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "rede" "enum redef" { target *-*-* } .-1 } */
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}
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/* Structure, union and enumerated types have a single namespace of tags. */
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{
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struct s0;
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struct s1;
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struct s2 { int i; };
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struct s2;
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struct s3 { int i; };
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struct s2 sv;
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union u0;
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union u2 { int i; };
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union u2;
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union u2 uv;
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enum e0 { E0A };
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enum e1 { E1A };
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/* None of the following are allowed; some were not detected by GCC. */
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union s0; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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union s1 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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union s2; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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union s3 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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enum u0 { U0A }; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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enum u2 { U2A }; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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struct e0; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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struct e1 { int i; }; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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}
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/* Explicit shadowing in inner scopes is OK, but references to the tag
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that don't explicitly shadow it must (whether in declarations or
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expressions) use the correct one of struct/union/enum. */
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{
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struct s0;
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struct s1;
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struct s2 { int i; };
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struct s2;
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struct s3 { int i; };
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struct s2 sv;
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union u0;
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union u2 { int i; };
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union u2;
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union u2 uv;
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enum e0 { E0A };
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enum e1 { E1A };
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{
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union s0;
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union s1;
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union s2;
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union s3;
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struct u0;
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struct u2;
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struct e0;
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union e1;
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}
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{
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union s0 *x0; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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int x1[sizeof (union s1 *)]; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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struct t;
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union s2 *x2;
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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int x3[sizeof (union s3 *)]; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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struct u;
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enum u0 *y0; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong|forward" "wrong tag type" { target *-*-* } .-1 } */
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int y1[sizeof (enum u2 *)]; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong|forward" "wrong tag type" { target *-*-* } .-1 } */
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struct v;
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struct e0 *z0; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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int z1[sizeof (struct e1 *)]; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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struct w;
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}
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/* When explicitly shadowed to be a tag of a different type, references
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to the new type of tag must be accepted and those to the old type
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rejected. */
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{
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union s0;
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union s0 *x0;
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union s1;
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struct s1 *x1; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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union s2;
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union s2 *x2;
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union s3;
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struct s3 *x3; /* { dg-bogus "warning" "warning in place of error" } */
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/* { dg-error "wrong" "wrong tag type" { target *-*-* } .-1 } */
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}
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}
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}
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