Compiling for RPi1 - `-mcpu` build option

[torn rain]

I'm trying to use the build system for compiling for Raspberry Pi 1. I can build with zig build-exe main.zig -target arm-linux-musleabi -mcpu arm1176jzf_s and get an executable that works, but using the build system, I only get as far as

exe.target = .{
            .cpu_arch = .arm,
            .os_tag = .linux,
            .abi = .musleabi,
        };

Is the -mcpu switch still not supported?

Ooh - reading between the lines of https://ziglang.org/learn/build-system/, I figured it out:
$ zig build -Dtarget=arm-linux -Dcpu=arm1176jzf_s

Then I don't even have to set the exe.target stuff.