ian-twilightcoder wrote:

> Also note that `ASTWriter` uses this logic in couple of places to avoid 
> serializing unrelated headers:
> 
> ```c++
> if (!HFI || (HFI->isModuleHeader && !HFI->isCompilingModuleHeader))
>   continue;
> ```
> 
> Since textual headers from other modules have `isModuleHeader=false` and 
> `isCompilingModuleHeader=false` after #83660 we always serialize them, even 
> if we just implicitly found their module map and never entered them. I didn't 
> check how this patch interacts with that logic, just wanted to surface this.

#83660 _shouldn't_ affect that logic. `isModuleHeader` and 
`isCompilingModuleHeader` _should_ always have the same values after that 
change. It's supposed to just add an extra `isTextualModuleHeader` without 
changing any of the other bits.

https://github.com/llvm/llvm-project/pull/89005
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