[llvm-dev] [PATCH] [CMake] Allow parent projects to use in-source builds

[Chris Bieneman via llvm-dev]

This patch looks reasonable to me. Thank you for submitting it.

Is it correct to assume you don't have commit access? If you don't I can commit it for you later today.

-Chris

> On Oct 8, 2017, at 9:36 PM, Henrique Jung via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> 
> Hi
> 
> Would the maintainers please consider merging the attached patch? Detailed description of my problem is on the commit log.
> 
> I tracked down this build-time check back to a commit by Oscar Fuentes in 2008 (https://github.com/llvm-mirror/llvm/commit/6326a0d5090110c334a3a554bfb10b37a6fe4709 <https://github.com/llvm-mirror/llvm/commit/6326a0d5090110c334a3a554bfb10b37a6fe4709>) and hasn't been changed since. It seems to be unnecessary to prevent a parent project from doing in-source builds.
> 
> I ran my project with `make` and it seems to have solved my problem. LLVM now builds out-of-tree while my project can be built in-tree. 
> 
> I ran 'make check-llvm' to test it, which gave me this result.
> 
> Testing Time: 121.05s
>   Expected Passes    : 21278
>   Expected Failures  : 220
>   Unsupported Tests  : 788
> [100%] Built target check-llvm
> 
> However I couldn't build `make check-llvm` using in-tree builds, I had to fall back to out-of-tree builds. So to summarize: now LLVM can be part of a parent project that uses in-source builds, but the tests must still be built out-of-tree. If the maintainers are OK with this limitation, the patch is ready. Otherwise I'd have to track down what changes are necessary on the test targets.
> 
> Best regards
> Henrique Jung
> 
> <0001-CMake-Allow-parent-projects-to-use-in-source-builds.patch>_______________________________________________
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