cxx-llvm-build is used at run time in 2 crates. It's used at build time in 6 crates.

Depender (with downloads and own rev deps) cxx-llvm-build version
5 cxx-clang-build ^0.0
5 cxx-llvm-auto build ^0.0
2 cxx-llvm build ^0.0
2 cxx-swift-build ^0.0
1 cxx-swift-auto build ^0.0
2 cxx-clang-auto build ^0.0
1 cxx-clang build ^0.0
cxx-swift build ^0.0