Tier System: `riscv64-linux`

[andrewrk]

Once all these items are complete, we can say that Zig has Tier 1 support for 64-bit RISC-V Linux.

• make sure we can build-exe with -target riscv64-linux-gnu
• make sure we can build-exe with -target riscv64-linux-musl
• ability to build libc for riscv64-linux-gnu (unable to build glibc for target riscv64-linux-gnu #3340)
• ability to build libc for riscv64-linux-musl
• make sure stack traces / debug info works & add test coverage
• add the target to the test matrix
• get the full test suite passing
• figure out a risc-v linux continuous integration testing service and hook it up to zig's CI testing.
• hook up to update download page with risc-v tarballs

[Ivan-Velickovic]

zig build-exe hello.c -lc -target riscv64-linux-musl with version 0.10.0-dev.3660+4a98385b0 works.

[RossComputerGuy]

Looks like traces work, only needs to be added to the test coverage according to the task.

const std = @import("std");

pub fn a() !void {
    try b();
}

pub fn b() !void {
    try c();
}

pub fn c() !void {
    return error.@"I'm a cat";
}

pub fn main() !void {
    try a();
}

error: I'm a cat
/home/ross/ExpidusOS/zig/main.zig:12:5: 0x100b5b7 in c (main)
    return error.@"I'm a cat";
    ^
/home/ross/ExpidusOS/zig/main.zig:8:5: 0x100b6d9 in b (main)
    try c();
    ^
/home/ross/ExpidusOS/zig/main.zig:4:5: 0x100b71b in a (main)
    try b();
    ^
/home/ross/ExpidusOS/zig/main.zig:16:5: 0x100b75d in main (main)
    try a();
    ^