Dávid Bolvanský b06305e449 [Diagnostics] Warn for std::is_constant_evaluated in constexpr mode ...

Summary:
constexpr int fn1() {
  if constexpr (std::is_constant_evaluated()) // condition is always true!
    return 0;
  else
    return 1;
}

constexpr int fn2() {
  if (std::is_constant_evaluated())
    return 0;
  else
    return 1;
}

Solves PR42977

Reviewers: rsmith, aaron.ballman

Reviewed By: rsmith

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D69518

2019-10-31 10:03:11 +01:00

1.6 KiB

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