Comment # 6 on bug 1185203 from Christophe Giboudeaux

(In reply to Aaron Puchert from comment #3)
> 
> There is a bunch of unfortunate dependencies/conflicts here, and getting rid
> of any one of them would solve the issue. Moving the builtin headers from
> clang7 to libclang7 should be safe and would allow you to drop the clang7
> dependency. I could try to patch the CMake files shipped by LLVM to not be
> so picky, but I'm not sure if that works. And lastly I'm not sure whether
> either of the unresolvable packages really need libqt5-qttools-doc to build.
> I don't have it installed but kdevelop builds fine locally.

It wouldn't help for Qt5 packages. They use qmake. The issue here is that you
removed the split libraries to save space and only have libclang-cpp.so.

This part can be patched but first I need to be sure libqt5-qttools (and
libqt5-qtdoc as well) will be rebuilt.