Cross-compilation to platforms other than IA32 and X64 work by setting 
an environment variable such as GCC_AARCH64_PREFIX that contains the 
path/name of the cross-compiler without the "gcc", "objcopy" etc. suffix.

On IA32 and X64 however, the environment variable GCC_BIN has been used 
instead. With fast AArch64 and other non-x86 platforms now being 
available, I'd like to propose updating IA32 and X64 to work the same as 
other platforms by using e.g. GCC_IA32_PREFIX and GCC_X64_PREFIX.


I've attached a proposed patch: I'm attaching it here to gather feedback 
before opening a PR since it does change how builds are done and I want 
to check if it's something people want to proceed with.


  Rebecca


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