Cannot build without changing hardcoded values

[RasmusLar]

Reading this PR #176 I understand that there is no way to change the hardcoded values for the CLang compiler. I wanted to build a 64 bit version using MinGW with included CLang, using the some other linker which is the only one I had installed for 64 bit builds (Worked fine with 32bit builds, as it was installed), so I added:
Archiver {
Flags "-fuse-ld=ld"
}
, but it fails with clang: error: invalid linker name in argument '-fuse-ld=llvm-lib'
from the command: clang -fuse-ld=ld -fuse-ld=llvm-lib -o build/....

Suggestion:
Add a flag or some settings to be able to change these, but keep them default the same.
Right now I will solve it by changing LLVM install I guess, but it would be nice to be able to change it to what you would like to have, instead of having it hardcoded.