[Bug c/94558] New: Designated initializer inside _Generic is misinterpreted
elronnd at elronnd dot net
gcc-bugzilla@gcc.gnu.org
Sat Apr 11 07:49:39 GMT 2020
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94558
Bug ID: 94558
Summary: Designated initializer inside _Generic is
misinterpreted
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: elronnd at elronnd dot net
Target Milestone: ---
POC:
typedef struct{int _;} A;
typedef struct{int _;} B;
typedef union {
A a;
B b;
} O;
#define NO(o) _Generic((o), \
A: ((O){.a=o}), \
B: ((O){.b=o}))
int main() {
A a;
O o = NO(a);
}
Generates the error message:
incompatible types when initializing type ‘int’ using type ‘A’ {aka ‘struct
<anonymous>’}
Because it's trying to initialize the '_' field in 'A' with 'a', instead of the
'a' field in 'O'.
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