The efidroid project is working on a new toolchain for UEFI. Tianocore’s build environment is strange enough that it is hard to use outside Tianocore, like when a distro needs to build a .efi binary, for example.

crosstool-ng project for UEFI
Crosstool-NG config and patches for building a UEFI toolchain

https://github.com/efidroid/crosstool-ng-uefi

http://efidroid.org/