-arch: not found

[Jonathan Wakely]

On 5 January 2017 at 23:21, Nick Leli wrote:
> I am trying to compile GCC from Ubuntu, for Darwin by following this
> guide: http://wiki.osdev.org/GCC_Cross-Compiler#The_Build
>
> I have followed the steps but feel like I am missing something based
> on the comments from the configure suffix error I am receiving:
> https://gcc.gnu.org/wiki/FAQ#configure_suffix .
>
> Here are the steps I've taken:
> 1. Downloaded the gcc pre-requisites

Just downloaded the tarballs? Built and installed them? Or run the
contrib/download_prerequisites script?

> 2. Configured and built binutils from outside the source directory

Just built, or built and installed?

> 3. Configured and built gcc from outside the source directory, and
> separate from binutils.  The target used was the same target value I
> see on OSX 10.11.6 (x86_64-apple-darwin15.6.0)
> 4. Ensured the src/gcc-6.3.0 directory is in my path, so GMP/MPFR/MPC
> can be found

This step is not necessary, there are no executables for GMP, MPFR or
MPC, so nothing to be found in your PATH.

> 5. Deleted contents of build directory and started over with the steps above.
> 6. Ensured all pre-requisites are on the host:
> https://gcc.gnu.org/install/prerequisites.html
> 7. Attempted to configure gcc with --disable-werror
>
> I was under the impression that gcc can be built for any architecture,
> as long as you specify what you want to build it for.  Is there
> something additional I need to do in order to get a working compiler
> for a different architecture?  Any insight is greatly appreciated.
>
> Here is the gcc configure command I ran: ../gcc-6.3.0/configure
> --target=x86_64-apple-darwin15.6.0 --prefix="$PREFIX" --disable-nls
> --enable-languages=c --without-headers --disable-werror
>
> Here is the last error I'm seeing in
> $build_directory/x86_64-apple-darwin15.6.0/libgcc/config.log
>
> configure:3653: checking for suffix of object files
> configure:3675: /home/ubuntu/src/build-gcc/./gcc/xgcc
> -B/home/ubuntu/src/build-gcc/./gcc/
> -B/home/ubuntu/opt/cross/x86_64-apple-darwin15.6.0/bin/
> -B/home/ubuntu/opt/cross/x86_64-apple-darwin15.6.0/lib/ -isystem
> /home/ubuntu/opt/cross/x86_64-apple-darwin15.6.0/include -isystem
> /home/ubuntu/opt/cross/x86_64-apple-darwin15.6.0/sys-include    -c -g
> -O2  conftest.c >&5
> /home/ubuntu/src/build-gcc/./gcc/as: 106: exec: -arch: not found

This suggests an assembler for the target was not found. Did you
install binutils? Is it either in $PREFIX or is $PREFIX/bin in your
PATH?