Hi there! Happy user of the iOS toolchain here :)
Out of curiosity, have you considered adding support for compiling/linking Mac apps with the toolchain?
Since it seems like the iOS toolchain linker already has support for .tbd files and other interesting Apple "stuff", maybe this wouldn't be too difficult?
Currently, I'm using osxcross through Docker for this purpose, but would be really happy if I could get rid of the VM.