Going back two years has been an initiative to build the Debian package base with LLVM/Clang rather than GCC -- for much the same reasons as building the Linux kernel with Clang. Thanks to Google's Summer of Code, there's been more progress on building out Debian using the latest Clang compiler...
September 15, 2014
LLVM Clang Now Builds Even More Debian Packages
Read more at Phoronix