dlj added a comment.

In https://reviews.llvm.org/D34853#798699, @andrewng wrote:

> Hi,
>
> I believe that this "build mode" is intended for the Visual Studio MSVC 
> build. This build is special in that it can produce builds for multiple 
> configurations, e.g. Debug, Release & RelWithDebInfo, within the same top 
> level build output directory. It is this configuration type that defines the 
> "build mode". This means that the unit tests will only pick up the 
> configuration that matches that of the lit that was run. Without the "build 
> mode" I believe lit might end up running all configurations of unit tests 
> that have been built, which is probably not the intended behaviour.
>
> Cheers,
> Andrew


Ah, excellent. I suspected something like this.

(I don't usually have access to Windows, and even then I typically use Ninja 
instead of VS... so cleanups like this could be hit-or-miss, I guess.)


Repository:
  rL LLVM

https://reviews.llvm.org/D34853



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