[llvm-bugs] [Bug 42192] New: Mangler incorrectly handles templated decltype in parameter type

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42192

            Bug ID: 42192
           Summary: Mangler incorrectly handles templated decltype in
                    parameter type
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jorg.brown 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

Given this code:

template <bool _Bp, class _If, class _Then> struct cond {
  using type = _If;
  _If memvar;
};

template<bool b>
void t2(decltype(cond<b, int, char>::memvar) param) { }

template void t2<true>(int);

gcc mangles this as _Z2t2ILb1EEvDtsr4condIXT_EifE6memvarE
clang mangles it as _Z2t2ILb1EEvDtsr4condIXT_EicEE6memvarE

demangler.com can demangle gcc's version but not clang's.

See gcc trunk vs clang trunk at https://godbolt.org/z/Rxn4XN

clang has been able to compile this code since at least as far back as version
3.8, but apparently has always mangled it wrong.

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