llvm/clang compile error with Memory exhausted

You need to do one of the following:

1. Add more RAM to your VM, or
2. Use gold instead of ld as a linker, or
3. Build Release(-DCMAKE_BUILD_TYPE=Release), not Debug build

Another consideration: If you have Make running parallel jobs (e.g., make -j8), the concurrently executing jobs may require too much memory.