LLVM with Clang/GCC for Eclipse CDT plug-in provides LLVM toolchain with Clang or llvm-gcc compiler to compile C/C++ programs.
LLVM is a rather modern toolchain that supports the compilation of C/C++ code (among others) to LLVM virtual machine's bitcode, which in turn can be compiled to each platform's native binary.
The plug-in includes the following tools from the LLVM toolchain: Clang/Clang++/llvm-gcc/llvm-g++ (C/C++ compilers), llvm-ld (linker), llvm-ar (archiver), llvm-as (assembler), llc (static compiler) and lli (JIT/Interpreter).