r321855 - Reapply r321781: [Modules] Allow modules specified by -fmodule-map-file to shadow implicitly found ones

[Richard Smith via cfe-commits]

On 9 January 2018 at 18:46, Bruno Cardoso Lopes via cfe-commits <
cfe-commits at lists.llvm.org> wrote:

> Hi Eric,
>
> On Mon, Jan 8, 2018 at 9:31 PM, Eric Fiselier <eric at efcs.ca> wrote:
> > I haven't done a ton of investigation yet, but I suspect this commit is
> > responsible for breaking my LLVM module selfhost build, which uses
> libc++ as
> > the STL, and builds LLD (No bots appear to test this configuration).
> >
> > The error message can be found here:
> > https://gist.github.com/EricWF/fb5e1d18eb1069d23788469b5fb15442
> >
> > I'll investigate further tomorrow, but I wanted to send this your way in
> > case it looks familiar.
>
> Haven't seen this one before, maybe because of this particular
> configuration. I'm happy to help out fixing it, I can try a similar
> setup and see what I get. It would be nice if you can confirm this is
> the culprit commit though.
>

See r321395, which recently added this warning, and is a much more likely
culprit than this change.
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