On Mon, Mar 18, 2013 at 6:33 AM, Sam Thursfield <sam.thursfield@xxxxxxxxxxxxxxx> wrote: > > Could someone explain how GCC can be cross-built for new architectures now > that it requires C++ to build? It seems to be that there is the following > dependency loop: > > - Building libstdc++ for target requires a libc for the target > - Building libc for target requires a gcc for target > - Building gcc for target requires at least a g++ that cross-compiles > - The cross-g++ for the target requires a libstdc++ built for the target > > For architectures that GCC is already built for, I hear that this will be > solved by ensuring GCC version N can be built by version N-1. But how will > this work for a new architecture, which doesn't yet have a GCC built for it? Normally compilers for new architectures are initially built as cross-compilers. So the procedure is: * Build cross-GCC for target using host libstdc++ * Use cross-GCC to build libc for target * Use cross-GCC to build libstdc++ for target * Use cross-GCC, libc, libstdc++ to build native GCC for target Ian
