Interest in reproducing gcc-linaro-4.9-2016.02 arm-linux-gnueabihf target under darwin and linux aarch64 host

Hello,

I see this release gcc-linaro-4.9-2016.02 for 86_64_arm-linux-gnueabihf: https://releases.linaro.org/components/toolchain/binaries/4.9-2016.02/arm-li...

and would like to reproduce the toolchain for aarch64 hosts. I see that it was built with ABE, though I have generally been unsuccessful in getting ABE to work on aarch64 for this. I was looking for some build or ci breadcrumbs or documentation. What can you recommend?

The motivation here is to support legacy development/testing from modern aarch64 hardware.

Cheers, Joe Gorse