x/build/internal/releasetargets: distribute official binaries for linux/riscv64

[colemickens]

What version of Go are you using (go version)?

1.18

(I got stressed out between the 6 bug templates and 6 external communities to discuss Go topics so here goes nothing.)

The only tracking issues I can find for riscv64 seem to be closed:

• all: port to RISC-V #27532
• all: add cgo support to the riscv port #36641

However, https://go.dev/dl/?mode=json&include=all does not include a bootstrap for GOOS=linux GOARCH=riscv64.

NixOS and nixpkgs currently use this json and the pre-built bootstraps for some/most Go packaging support, so this would likely help us get riscv64 support going a bit further.

Alternatively, maybe there's an unofficial builder out there producing builds that I could at least experiment with?

Thanks!

[mengzhuo]

@golang/release

[gopherbot]

Change https://go.dev/cl/481477 mentions this issue: internal/releasetargets: add linux-riscv64 as a release target

[dmitshur]

This is done as part of #53862.

Binary releases for the linux/riscv64 port will be available starting with Go 1.21.
For example, see go1.21rc2.linux-riscv64.tar.gz at https://go.dev/dl/#go1.21rc2.

(It happens to also be the port visible in the image at https://twitter.com/golang/status/1671582916567080962.)