New comment by Marie-Joseph on void-packages repository

https://github.com/void-linux/void-packages/issues/34752#issuecomment-1003234652

Comment:
So I've managed to try some cross-compilation today, both of LDC and GDC.

For GDC compilation, I added a D build option. I had some trouble getting libisl downloaded. It seems the link in the current template stopped working sometime in the last couple days. I managed to find a different one that still works at https://libisl.sourceforge.io though. However, for some reason g++ gets passed the flag "-march=armv8-a" at some point, which is not a valid value for that flag. From what I can tell, that flag is only valid for x86* builds since valid options all seem to be code names or descriptors of various x86* architectures. Without digging into makefiles I don't think I can resolve that, so I moved on to trying to compile LDC with LDC.

The first problem with compiling LDC with LDC is that it requires the ldmd front-end. Void doesn't package the ldmd front-end. So I decided to try natively compiling it to get build artifacts to figure out how to package the ldmd front-end so I can do that and install it to use it to cross-build LDC with LDC. But unfortunately, it can't find a *bunch* of LLVM headers. Maybe because I'm using musl? In any case, resolving that particular issue seems even more time-consuming than getting GDC to compile.

So I'm going to take a break (I've been at this for the plurality of my waking hours since opening this issue) and when I come back I guess I'll be digging into makefiles.