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/*
* { dg-do compile }
* { dg-options "-std=c23" }
*/
// allowed and forbidden redefinitions of the same struct/union in the same scope
typedef struct p { int a; } pd_t;
typedef struct p { int a; } pd_t;
typedef struct bar { int x; } X;
typedef struct bar { float x; } Y; /* { dg-error "redefinition of struct or union" } */
void test(void)
{
struct foo { int x; };
struct foo { float x; }; /* { dg-error "redefinition of struct or union" } */
}
struct aa { int a; };
void f(void)
{
typedef struct aa A;
struct bb { struct aa a; } x;
struct aa { int a; };
typedef struct aa A; /* { dg-error "redefinition" } */
struct bb { struct aa a; } y; /* { dg-error "redefinition of struct or union" } */
(void)x; (void)y;
}
void h(void)
{
struct a2 { int a; };
{
typedef struct a2 A;
struct b2 { struct a2 a; } x;
struct a2 { int a; };
typedef struct a2 A; /* { dg-error "redefinition" } */
struct b2 { struct a2 a; } y; /* { dg-error "redefinition of struct or union" } */
(void)x; (void)y;
}
}
union cc { int x; float y; } z;
union cc { int x; float y; } z1;
union cc { float y; int x; } z2; /* { dg-error "redefinition of struct or union" } */
void g(void)
{
struct s { int a; };
struct s { int a; } x0;
struct p { struct s c; } y1 = { x0 };
struct p { struct s { int a; } c; } y = { x0 };
}
struct q { struct { int a; }; };
struct q { struct { int a; }; };
struct q { int a; }; /* { dg-error "redefinition of struct or union" } */
struct r { int a; char b[]; };
struct r { int a; char b[]; };
struct r { int a; char b[1]; }; /* { dg-error "redefinition of struct or union" } */
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