whitequark wrote:

> Comments in the config file isn't a harmful thing, but I'm also worried about 
> folks who never see the config file. e.g., they're working in Path.inc on 
> something, see `HAVE_PWD_H` in the code, and just make assumptions from there.
> 
> So perhaps a two-pronged approach: a comment in config.h for the cases where 
> we don't expect a graceful fallback, and a similar comment around the guarded 
> #include in source for the folks who won't look in config.h?

I could do that. What do you think of the fairly strongly worded objection in 
the RFC thread that requested I use `defined(__wasi__)` instead of individual 
conditionals?

https://github.com/llvm/llvm-project/pull/92677
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