benlangmuir added a comment.
> Can you point me to the source codes where we use rename to replace the file?
> I am curious on how this all works out.
This is the same as clang's handling of other output files. See
{{CompilerInstance::createOutputFile}} and {{clearOutputFiles}}. When we are
performing the GenerateModuleAction, the .pcm file will be the output file.
> What I described is a scenario I thought possible that can cause
> "out-of-date" error:
> module "B" is out of date and needs to be rebuilt
> note: imported by module "A"
> The only invocation of ReadAST that reads a module file and can't handle
> out-of-date modules, is the path where we just built module "A" and tries to
> load module "A" (here ModuleLoadCapabilities will be ARR_Missing).
Right, here and in PCH loading (I assume your case doesn't involve a PCH). I'm
concerned about adding this loop, because it removes the guarantee of progress.
We should never need to build a module more than once in the same compilation.
If we have a bug that's causing us to not be able to load a module that we
just compiled, I think we need to fix the underlying problem, not just retry
the build.
https://reviews.llvm.org/D22636
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