[llvm-branch-commits] [clang] [Clang] [C++26] Expansion Statements (Part 10: Expansion Limit) (PR #169689)

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Sirraide wrote:

> > Iirc when I was testing this it did 1 million expansions w/o hitting any existing limits; that was w/ an empty expansion statement but that already took a few seconds.
> 
> That's fine - the limits are there to avoid overwhelming the compiler, not because something might be slow

I’m more worried about it taking even longer and someone mistakenly thinking that we have a bug in Clang or that the compiler is hanging when the bug would really be in user code in this case; iirc @AaronBallman has said in the past that the `constexpr` steps limit exists for a similar reason, so I thought it’d make sense to implement something similar for this.

(side note: I don’t believe 1 million expansions would ever not be a bug candidly...)

https://github.com/llvm/llvm-project/pull/169689