[llvm-bugs] [Bug 30723] New: false positive for "-Wzero-length-array"

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30723

            Bug ID: 30723
           Summary: false positive for "-Wzero-length-array"
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Casey at Carter.net
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

This program:

template <int N = 42>
auto f() -> decltype(new int[N]{});

using F = decltype(f());

compiled with -Wzero-length-array (which happens to be under -pedantic) results
in:

prog.cc:2:32: warning: zero size arrays are an extension [-Wzero-length-array]
auto f() -> decltype(new int[N]{});
                               ^

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