AVR cross-compilation leads to invalid bitcast

[schroffl]

This is semi-related to #3634. @MasterQ32 made me aware of the setTarget deprecation. After replacing that call with setTheTarget I am now getting a different error:

broken LLVM module found: Invalid bitcast
void (%"[]u8"*, %std.builtin.StackTrace*)* bitcast (void (%"[]u8"*, %std.builtin.StackTrace*) addrspace(1)* @panic to void (%"[]u8"*, %std.builtin.StackTrace*)*)

These are the relevant files:

src/main.zig

const std = @import("std");
const builtin = @import("builtin");

pub nakedcc fn _start() noreturn {
    while (true) {}
}

pub fn panic(msg: []const u8, trace: ?*builtin.StackTrace) noreturn {
    while (true) {}
}

build.zig

const std = @import("std");
const Builder = std.build.Builder;
const builtin = @import("builtin");

pub fn build(b: *Builder) void {
    const mode = b.standardReleaseOptions();
    const exe = b.addExecutable("zig-avr", "src/main.zig");
    exe.setBuildMode(mode);
    exe.setTheTarget(std.Target{
        .Cross = std.Target.Cross{
            .arch = .avr,
            .os = .freestanding,
            .abi = .eabi,
        },
    });
    exe.install();

    const run_cmd = exe.run();
    run_cmd.step.dependOn(b.getInstallStep());

    const run_step = b.step("run", "Run the app");
    run_step.dependOn(&run_cmd.step);
}

I am running zig 0.5.0+d18b5f8b5 on macOS 10.15.

[prazzb]

last I checked avr-lld is in very bad shape so I will be very surprised if there is an avr elf output..... however, avr-llvm is pretty good and there should've been proper .o files when used with build-obj command line option

[schroffl]

So I tried to only build the object file with zig, but running zig build-obj -target avr-freestanding-eabi src/main.zig yields the same error.

[prazzb]

I tested with 0.5.0 from zig website and doing
zig build-obj -target avr-freestanding-eabi src/main.zig
does compile giving .h and .o file

It seems something else in the interim has broken this

[schroffl]

Huh, weird. I currently cannot test it myself, but I will try it with a newer zig version as soon as possible.