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

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Jan 22 10:52:22 PST 2021


            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: unassignedclangbugs at nondot.org
          Reporter: ju.orth at gmail.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


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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