RISC-V Support

[acook]

Although the number is still small, I'm seeing more and more RISC-V devices out there. At some point it might be nice to ensure that Rebol can target this growing platform.

This would also require a Siskin build for that target architecture.

[Oldes]

It should not be such a problem, but RISC-V emulator would be needed, so I could make automatic builds in cloud like I do for HaikuOS.. do you have experience with any? Maybe this one https://github.com/DavidBurela/riscv-emulator-docker-image ?

[Oldes]

I just ordered VisionFive V2 Quad-core RISC-V dev board to play with it :-) Estimated delivery date is end of February. But I don't have much time at this moment anyway.

[acook]

That image uses QEMU and QEMU is the standard emulator, so that seems like the most reasonable starting point.

• https://wiki.qemu.org/Documentation/Platforms/RISCV

It is using dqib to build and install a Debian image into QEMU, so it's pretty neat that it can get a RISCV Linux install ready in so few steps.

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I also found these, just in case:

• https://github.com/LekKit/rvvm
• https://github.com/d0iasm/rvemu
• https://github.com/fwsGonzo/libriscv

[Oldes]

@acook Initial RISC-V build can be downloaded from here: https://rebol.tech/builds/3.15.1/rebol3-bulk-linux-riscv64.gz

[Oldes]

Cross-compilation: https://github.com/Siskin-framework/Builder/commit/8713961709d2c3857799ab7eff625f898d4049d3

[acook]

I expected this to be aspirational, not something with a turnaround of a week. Really goes to show how platform support has matured. Both GCC and QEMU and Linux, all handling it smoothly. I don't even see any RISC-V specific changes outside of the build tools.