In llvm7.spec, the Clang binaries are renamed:

# Fix the clang -> clang-X.Y symlink to work with update-alternatives
mv %{buildroot}%{_bindir}/clang-%{_sonum} %{buildroot}%{_bindir}/clang
ln -s %{_bindir}/clang-%{_relver} %{buildroot}%{_bindir}/clang-%{_minor}

but the installed CMake files (in /usr/lib64/cmake/clang/) aren't changed
accordingly. This makes it hard to build software that uses libclang. (I came
across this when trying to update include-what-you-use.)

The issue is easy to reproduce. Just create a folder with a CMakeLists.txt
having just this line:

find_package(Clang CONFIG REQUIRED)

Then run "cmake ." and there will be an error message like

CMake Error at /usr/lib64/cmake/clang/ClangTargets.cmake:296 (message):
  The imported target "clang" references the file

     "/usr/bin/clang-7"

  but this file does not exist.  Possible reasons include: [...]

Indeed, we have

* /usr/bin/clang -> /etc/alternatives/clang -> /usr/bin/clang-7.0.0
* /usr/bin/clang-7.0 -> /usr/bin/clang-7.0.0

but no /usr/bin/clang-7. That is a bit unusual. On the other hand for gcc, we
have

* /usr/bin/gcc -> /usr/bin/gcc-8