Undefined symbols for architecture arm64: "_host_hooks" – Apple Silicon

[aislynn-ortega]

I'm trying to build the toolchain on a Macbook M3 Pro and I'm getting this error.

Undefined symbols for architecture arm64:
Undefined symbols for architecture arm64:
  "_host_hooks", referenced from:
      c_common_no_more_pch() in c-pch.o
      gt_pch_save(__sFILE*) in libbackend.a[94](ggc-common.o)
      gt_pch_restore(__sFILE*) in libbackend.a[94](ggc-common.o)
      toplev::main(int, char**) in libbackend.a[273](toplev.o)
ld: symbol(s) not found for architecture arm64
  "_host_hooks", referenced from:
      c_common_no_more_pch() in c-pch.o
      gt_pch_save(__sFILE*) in libbackend.a[94](ggc-common.o)
      gt_pch_restore(__sFILE*) in libbackend.a[94](ggc-common.o)
      toplev::main(int, char**) in libbackend.a[273](toplev.o)

It's related to this and the workaround is mentioned here

What I did was to, basically, comment these lines on `build/gcc-7.2.0/gcc/config.host

case ${host} in
  *-darwin*)
    # Generic darwin host support.
    #out_host_hook_obj=host-darwin.o
    #host_xmake_file="${host_xmake_file} x-darwin"
    ;;  
esac