The Glorious Glasgow Haskell Compilation System, more commonly known as the Glasgow Haskell Compiler or simply GHC, is an open source native code compiler for the functional programming language Haskell. It provides a cross-platform environment for the writing and testing of Haskell code and it supports numerous extensions, libraries, and optimizations that streamline the process of generating and executing code. The lead developers are Simon Peyton Jones and Simon Marlow.