Segfault when running zig build

[mrakh]

I'm using the latest version (zig-0.8.0-dev.1825+d2d4df407).

Here is my build.zig:

const std = @import("std");

fn createCpuSet(features: []const std.Target.x86.Feature) std.Target.Cpu.Feature.Set {
    var set = std.Target.Cpu.Feature.Set.empty;
    for(features) |feature| {
        set.addFeature(
            @intCast(
                std.Target.Cpu.Feature.Set.Index,
                @enumToInt(feature)
            )
        );
    }
    return set;
}

pub fn build(b: *std.build.Builder) !void {
    const kernel = b.addExecutable("a.out", "src/main.zig");
    kernel.setOutputDir("build");
    kernel.red_zone = false;
    kernel.setBuildMode(b.standardReleaseOptions());
    kernel.setTarget(.{
        .cpu_arch = .x86_64,
        .os_tag = .freestanding,
        .abi = .none,
        .cpu_model = .{
            .explicit = &std.Target.x86.cpu.x86_64
        },
        .cpu_features_sub = createCpuSet(&.{ .mmx, .sse }),
        .cpu_features_add = createCpuSet(&.{ .soft_float }),
    });
    b.default_step.dependOn(&kernel.step);
}

Here is my src/main.zig:

export fn _start() noreturn {
    while (true) {
        asm volatile ("nop");
    }
}

Here is the error I get when running zig build:

The following command terminated unexpectedly:
tmp/.zig/zig build-exe /root/src/main.zig --cache-dir /root/zig-cache --global-cache-dir /root/.cache/zig --name a.out -mno-red-zone -target x86_64-freestanding-none -mcpu=x86_64-mmx+soft_float-sse --enable-cache 
error: the following build command failed with exit code 11:
/root/zig-cache/o/43d7fb0f5cbd6f934528766dbd355070/build /tmp/.zig/zig /root /root/zig-cache /root/.cache/zig

Here is the GDB trace:

Thread 3.1 "zig" received signal SIGSEGV, Segmentation fault.
[Switching to LWP 14723]
0x00000000057e40a3 in llvm::DAGTypeLegalizer::SoftenFloatRes_Binary(llvm::SDNode*, llvm::RTLIB::Libcall) ()

Poking around a bit, I believe the issue revolves around the use of soft_float in my build.zig.

[LemonBoy]

Here you go zig build-exe -mcpu=x86_64-mmx-sse-sse2-x87+soft_float /tmp/foo.zig