[clang] [clang] add `-fimplicit-constexpr` flag (PR #136436)

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/136436 at github.com>


cor3ntin wrote:

@Sirraide we could do the check at the point of call - and cache the result, which would require storing some state in FunctionDecl. Or just not care. GCC is explicit about not supporting this scenario https://compiler-explorer.com/z/Mdva4f1a1 - and i don't see the value in diverging from GCC

We also should be careful about the whole consteval propagation thing, which would be affected by this feature.
I think @philnik777, this probably needs an RFC, but it does seem reasonable to me to follow in GCC's footsteps here.


https://github.com/llvm/llvm-project/pull/136436