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

[Henrique Jung via llvm-dev]

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) 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
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