[Bug c/123309] New: checking ICE with transparent union

[uecker at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123309

            Bug ID: 123309
           Summary: checking ICE with transparent union
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: uecker at gcc dot gnu.org
  Target Milestone: ---

Investigating the root cause for PR121081 I found some other issue related to
inconsistent handling of atomic in the C FE. 

https://godbolt.org/z/66srqbare

typedef union {
  const struct sockaddr *_Atomic __sockaddr__;
} __CONST_SOCKADDR_ARG __attribute__((transparent_union));
extern int sendto (__CONST_SOCKADDR_ARG __addr);

int sendto(const struct sockaddr *_Atomic to)
{
        const struct sockaddr *_Atomic *p = &to;
}