In Readme.md, the macOS build instructions yields the error (Sierra):

checking for gobjcopy... no
checking for objcopy... no
configure: error: missing required tool: gobjcopy objcopy
make[1]: *** [_ct-ng] Error 1
make: *** [crosstool-NG/ct-ng] Error 2

Adding the following to the path fixes it:

export PATH="/usr/local/opt/binutils/bin:$PATH"

When reading https://ppci.readthedocs.io/en/latest/reference/codegen/registerallocator.html , I was surprised that corresponding .rst file is almost empty: https://github.com/windelbouwman/ppci-mirror/blob/master/docs/reference/codegen/registerallocator.rst , and the contents comes fully from the corresponding .py module, https://github.com/windelbouwman/ppci-mirror/blob/master/ppci/codegen/regist