Note that Apple refers to the Clang compiler as “LLVM Compiler N,” where N is the current version number-4.0 as of Xcode 4.4. The current compiler is the Clang compiler, which combines a new unified parser for C, Objective C, C++, and Objective C++ with the LLVM code generator and optimizer. In the first part of the transition Apple used a compiler called llvm-gcc-4.2 that combined the front end from gcc 4.2 with the LLVM code generator and optimizer. LLVM is not a single compiler it is a set of modules that can be used to build compilers, debuggers, and related tools.
However, in the past several years they have transitioned to using compilers from the open-source LLVM (Low Level Virtual Machine) project.
Historically, Apple has used the open-source GNU compiler, gcc, for building iOS and OS X programs.
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