[llvm-bugs] [Bug 32034] Assert-on-valid: "temporary created multiple times"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32034

Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #4 from Richard Smith <richard-llvm at metafoo.co.uk> ---
This was broken before the constexpr if changes; it's failing now due to a
change in stack layout. The problem is that AtomicExprEvaluator does this:

  bool ZeroInitialization(const Expr *E) {
    ImplicitValueInitExpr VIE(
        E->getType()->castAs<AtomicType>()->getValueType());
    return Evaluate(Result, Info, &VIE);
  }

... but Evaluate uses the Expr* as a key in a map when it's creating a class
temporary. Somewhat more reduced testcase:

  struct B {};
  struct C { _Atomic(B) c; };
  constexpr int n = (C(), C(), 0);

Fixed by r295886.

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