Switch warnings with -Weverything on clang 18

[omajid]

With clang 18, when using the -Weverything flag with code involving switches, I get switch-related warnings no matter what I do.

If the switches are exhaustive. clang -Weverything complains the switch is missing a default:

$ cat test.c 
#include <assert.h>

typedef enum {
        ZERO = 0,
        ONE = 1,
} Number;

int test(Number number);

int test(Number number)
{
        switch (number)
        {
                case ZERO:
                        return 0;
                case ONE:
                        return 1;
        }

        assert(0);
        return -1;
}
$ clang -c test.c  -o test.o -Wall -Weverything
test.c:13:2: warning: 'switch' missing 'default' label [-Wswitch-default]
   13 |         switch (number)
      |         ^
1 warning generated.

When default is present, clang complains that the switch is exhaustive and default shouldn't be used:

$ cat test.c
#include <assert.h>

typedef enum {
        ZERO = 0,
        ONE = 1,
} Number;

int test(Number number);

int test(Number number)
{
        switch (number)
        {
                case ZERO:
                        return 0;
                case ONE:
                        return 1;
                default:
                        assert(0);
                        return -1;
        }

        assert(0);
        return -1;
}

$ clang -c test.c  -o test.o -Wall -Weverything
test.c:19:3: warning: default label in switch which covers all enumeration values [-Wcovered-switch-default]
   19 |                 default:
      |                 ^
1 warning generated.

What can I do to make clang happy?

Environment:

$ clang --version
clang version 18.1.0 (Fedora 18.1.0~rc4-2.fc40)
Target: x86_64-redhat-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
Configuration file: /etc/clang/clang.cfg

[EugeneZelenko]

Duplicate of #81354.