The LLVM developers seem to be driven to replace all parts of the GCC toolchain and libraries with home-grown alternatives under BSD-style licenses. The latest addition to the project is libc++, an implementation of the C++ standard library which is faster and uses less memory than the GCC libstdc++. The developers also intend to support standard library debugging which is ABI compatible to the release version, which should help developers cut down on lengthy recompile-and-debug cycles. The project is still in an early state but it already implements 85% of the C++0x standard library. As with the rest of the LLVM project, the development of libc++ is being supported by Apple.