[RFC] go lang support as a build sytle

[yopito]

golang support as a build style, and some packaging to illustrate its usage.
apart from various WIP stuff in packages, I'll be glad with some informal review of this build style.

[q66]

thanks, i don't think we need this right now but once things are a bit more stable we can work out some review

[q66]

i wasn't happy with the whole gcompat nonsense so i experimented with generating toolchains and at that point i was far enough to have a working template, so that's in the repo now, i suggest dropping the toolchain from here and also drop gcompat because it makes no sense for chimera (any binaries you'd want to run with that would be linked with libgcc, and we don't have that and there is a good chance we never will)

we can try getting in the build style eventually (it looks like it needs a lot of work though)

the random software should be standalone pull requests

[yopito]

OK, i'll rework this PR, only with the go build style.

[vazub]

I've tried the style and it works rather well overall. One thing that requires further investigation is that the app I've built did get debug symbols stripped, but a separate -dbg subpackage was not created.

[yopito]

I've tried the style and it works rather well overall. One thing that requires further investigation is that the app I've built did get debug symbols stripped, but a separate -dbg subpackage was not created.

I gave a try for -dbg: indeed such a package are generated. But lldb does not seem to use these debug symbols (below /usr/lib/debug) according to its comand "image list"
It seems that debugging a go binary with lldb requires dedicated flags at build time according to the old doc: https://ribrdb.github.io/lldb/
But I'm not clever enough about debugging technics of go binaries.

[vazub]

Should be fine to merge, unless @q66 has any additional concerns/requirements.

[q66]

i did a preliminary merge of this after some cleanup/adjustments, but without the documentation; only stable interfaces can be documented and i plan to not make this stable for a while (just like cargo)