[clang] [clang] Allow constexpr-unknown values pre C++23 (PR #129646)

[A. Jiang via cfe-commits]

Timm =?utf-8?q?Bäder?= <tbaeder at redhat.com>
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In-Reply-To: <llvm.org/llvm/llvm-project/pull/129646 at github.com>


frederick-vs-ja wrote:

Now many potentially useful error messages are merely adjusted. But `-Winvalid-constexpr` misbehaves due to some constexpr-unknown changes. This was not noticed perhaps because `-Winvalid-constexpr` is off by default since C++23.

Opened #149041. I guess that is the last blocking bug.

https://github.com/llvm/llvm-project/pull/129646