[llvm-bugs] [Bug 48850] New: Wrong size of union with zero-sized fields

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48850

            Bug ID: 48850
           Summary: Wrong size of union with zero-sized fields
           Product: clang
           Version: 11.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C
          Assignee: unassignedclangb...@nondot.org
          Reporter: ju.o...@gmail.com
                CC: blitzrak...@gmail.com, dgre...@apple.com,
                    erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
                    richard-l...@metafoo.co.uk

Consider

union X {
        long long c[0];
};

int f(void) {
        return sizeof(union X);
}

msvc returns 8, clang returns 4 for the x86_64-pc-windows-msvc target.

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