Possible to cross-test? (like cross compiling but running tests?)

[kj4tmp]

I got it working!

this is absolutely nuts that I was able to get this to work in only a few minutes!

I had to install the following packages (debian)

sudo apt install qemu-system-ppc qemu-utils binfmt-support qemu-user-static

and this is my build command:

zig build -fqemu -Dtarget=powerpc64-linux test --summary all

And I got the following output (I put a small warning when my test ran in big endian:

const native_endian = @import("builtin").target.cpu.arch.endian();

test "mem layout packed struct" {
    const Pack = packed struct(u48) {
        num1: u16 = 0x1234,
        num2: u16 = 0x5678,
        num3: u9 = 0b1_00000000,
        num4: bool = true,
        pad: u6 = 0,
    };

    const memory: [6]u8 = @bitCast(Pack{});
    switch (native_endian) {
        .big => {
            try std.testing.expectEqual(
                [6]u8{ 0x03, 0x00, 0x56, 0x78, 0x12, 0x34 },
                memory,
            );
            std.log.warn("ran big endian test!", .{});
        },
        .little => {
            try std.testing.expectEqual(
                [6]u8{ 0x34, 0x12, 0x78, 0x56, 0x00, 0x03 },
                memory,
            );
            std.log.warn("ran little endian test!", .{});
        },
    }
}

test
└─ run test stderr
[default] (warn): ran big endian test!
Build Summary: 5/5 steps succeeded; 7/7 tests passed
test success
├─ run test 4 passed 28ms MaxRSS:8M
│  └─ zig test Debug powerpc64-linux cached 8ms MaxRSS:36M
└─ run test 3 passed 23ms MaxRSS:8M
   └─ zig test Debug powerpc64-linux cached 8ms MaxRSS:36M

again, this is nuts that zig can do this!!!