Some initial hexagon-linux port work
#21587
Conversation
This works around the fact that LLVM and LLD both have broken support for the small data area, yet the feature is on by default for all Hexagon CPUs. I want to eventually replace this hack with a flag in update_cpu_features.zig for marking features that should always be off by default and not be accessible to users. That way, the compiler will have full control over them.
In theory, this should work for v68+. In practice, it runs into an LLVM assertion when using a `freeze` instruction on `f16` values, similar to the issue we had for LoongArch.
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Thanks for this work, @alexrp ! Note that the only C library that is really useful for this work is our downstream fork of musl. We've tried occasionally to get this upstreamed but not had much success. We're working on a nice system emulation platform w/linux that might be easier/better for the musl maintainers to evaluate/examine the patch series. But it's not quite 100% ready yet. Of course: there's nothing stopping you from continuing this work, so please carry on and let me know if I can help. |
Oh whoops I see you are well-informed here already #21588 |
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Yep, I'm hoping we can integrate your fork as a patch on top of upstream until it gets upstreamed. Zig does also support generating binaries that don't rely on libc at all and just use Linux syscalls directly, so that's what we'll focus on bringing up first. |
After this, the next step is #21579.