Hi, I'm having problems with that patch.
I try to start at X86_64-linux-gnu, and I want to get the GCC running on arm-linux-gnueabihf. I grabbed system headers and libraries from the target and put it in the prefix path. In the first step I do ../gcc-4.9-20131208/configure --prefix=/home/ed/gnu/arm-linux-gnueabihf-linux64 --target=arm-linux-gnueabihf --enable-languages=c,c++,fortran --with-arch=armv7-a --with-tune=cortex-a9 --with-fpu=vfpv3-d16 --with-float=hard This GCC runs on PC and generates arm-linux-gnueabihf executables. Then I try this ../gcc-4.9-20131208/configure --prefix=/home/ed/gnu/arm-linux-gnueabihf-cross --host=arm-linux-gnueabihf --target=arm-linux-gnueabihf --enable-languages=c,c++,fortran --with-arch=armv7-a --with-tune=cortex-a9 --with-fpu=vfpv3-d16 --with-float=hard But It fails because auto-build.h contains nonsense. That is probably because almost every check has a fatal error #include <gmp.h> not found. I personally prefer to have gmp, mpfr, mpc in-tree (using contrib/download_prerequisites). I experimented a bit and at least this attached patch improves the situation for me. Maybe I never had any problems with GMP before, because the in-tree configuration of GMP does -DNO_ASM ? Regards Bernd.
patch-configure.diff
Description: Binary data
