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    Add experimental xtoolchain ports for llvm-devel and llvm40. · 6c1dc6ff
    brooks authored
    With an appropriate port installed, in principle you can build a cross
    world and/or kernel without a bootstrap compiler or binutils with:
    
    make CROSS_TOOLCHAIN=llvm40 TARGET=arm64 buildworld buildkernel
    
    In practice, this only has a chance of working on platforms with solid
    LLD support.  At the moment I've had some success with i386, amd64, and
    arm64.
    
    Sponsored by:	DARPA, AFRL
    6c1dc6ff