This should solve this problem:
```
-- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB
-- Performing Test HAVE_CXX_ATOMICS_WITHOUT_LIB - Success
-- Looking for __atomic_load_8 in atomic
-- Looking for __atomic_load_8 in atomic - not found
CMake Error at /usr/lib/cmake/llvm/CheckAtomic.cmake:80 (message):
Host compiler appears to require libatomic for 64-bit operations, but
cannot find it.
```
Resolves: rhbz#2118319