[llvm-bugs] [Bug 48799] New: Clang rejects both "const" and "const*" as type-name inside _Generic

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48799

            Bug ID: 48799
           Summary: Clang rejects both "const" and "const*" as type-name
                    inside _Generic
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: cuoq at trust-in-soft.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

The _Generic construction expects a type-name in each association:
https://cigix.me/c17#6.5.1.1.p1

It seems to me and to GCC that "const" and "const*" are type-name
(https://cigix.me/c17#6.7.7.p1 )

However, Clang rejects each of the last two lines of the following function
with the message “error: expected a type”.

int main(void) {
    const x = sizeof (const) + _Alignof ( const );
    const *p = &(const){1};

    _Generic(x, const :1,int:2);
    _Generic(&x, const *:3,int*:4);
}

Compiler Explorer link: https://gcc.godbolt.org/z/8aYec8

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