ian-twilightcoder wrote:

> > @ilya-biryukov can you check that this fixes your running out of source 
> > location space problem please?
> 
> Just tried it. The patch as is did not help. I've also tried changing the 
> previous line to `getExistingFileInfo(, /*WantExternal=*/false)` and it 
> didn't help either.
> 
> Changing from `if ((Role & ModuleMap::ExcludedHeader))` back to `if 
> (!ModuleMap::isModular(Role))` does help, though, but that clearly leads to 
> an incorrect behavior as far as the code is concerned.

Does it not help because `headerFileInfoModuleBitsMatchRole` is returning 
`false`? The previous code was doing `WantExternal=true` so I don't think we 
want `getExistingLocalFileInfo()` here? I think if we used 
`getExistingLocalFileInfo()`, we'd get `nullptr` back more often and fall down 
into the `getFileInfo()` case more often wouldn't we?

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