[llvm-bugs] [Bug 42525] New: clang -m32 is ABI incompatible with GCC >= 7.0

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42525

            Bug ID: 42525
           Summary: clang -m32 is ABI incompatible with GCC >= 7.0
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: gonzalobg88 at gmail.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

These two snippets

// C++
#include <stddef.h>
size_t  square() {
    return alignof(max_align_t);
}
// C
#include <stddef.h>
size_t  square() {
    return _Alignof(max_align_t);
}

return 16 on Linux with all GCC versions >= 7.0 when compiled with -m32, but
clang trunk returns 8.

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