[Bug c++/104175] New: Enum Class Bit Fields Brace-enclosed Initializer List fails to compile

[bieri.hp at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104175

            Bug ID: 104175
           Summary: Enum Class Bit Fields Brace-enclosed Initializer List
                    fails to compile
           Product: gcc
           Version: 11.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bieri.hp at gmail dot com
  Target Milestone: ---

When using Enum Class Bit Fields brace-enclosed Initializer list fails to
compile, whereas with clang it does compile. I am not sure what the standard
demands but it seems reasonable that it compiles. 

#include <cstdint>

enum class EC: uint8_t {
    E1, E2, E3, E4
};

struct SEC
{
    EC ec1:2 = EC::E4;
};

struct S
{
    uint8_t a1:2 = 3;
};

void funcSEC( SEC sec) {}
void funcS( S s) {}

int main()
{
    funcS( { .a1 = 3});
    funcSEC( { .ec1 = EC::E2}); // error: could not convert '{EC::E2}' from
'<brace-enclosed initializer list>' to 'SEC'
    funcSEC( SEC { .ec1 = EC::E2}); // ok
}