On 2012-09-21 16:34 , reed kotler wrote: > Has anybody tried building gcc using clang/llvm as the first stage > compiler? Works fine with Ubuntu clang version 3.0-6ubuntu3 (tags/RELEASE_30/final) (based on LLVM 3.0) Target: x86_64-pc-linux-gnu Thread model: posix Build with: $ CXX=clang++ CC=clang ../src/configure $ make -j Diego.