zig cc: No way to pass -mcpu flag

[soulthreads]

After reading the recent post on zig cc I've got really excited, and decided to try it out to cross-compile some apps for a Raspberry Pi Zero W I have laying around.

zig cc hello.c -target arm-linux-musleabihf and everything seems OK so far.
After scp-ing the executable to the Pi however, I immediately get
Illegal instruction (core dumped).

objdump -f hello reveals that the architecture of the produced binary is armv7, and uname -m on Pi Zero W reports amrv6l,
so I thought that specifying -target armv6l-linux-musleabihf would work, but it doesn't:
invalid target: unrecognized architecture.
Neither does -target armv6-linux-musleabihf or any other combination.

Zig has a command-line option -mcpu, and in fact, if I build a .zig file like so:
zig build-exe hello.zig -target arm-linux -mcpu arm1176jzf_s
I get a binary that works on my Pi Zero W.
(By the way, there doesn't seem to be a way to specify -mcpu when using zig build as well, but that's probably a separate issue)

However, if I try to use that in cc mode:
zig cc hello.c -target arm-linux-musleabihf -mcpu arm1176jzf_s
I get this:
Unknown Clang option: '-mcpu'

Using = instead of gives:
zig: error: the clang compiler does not support '-mcpu=arm1176jzf_s'

So I'm a bit lost here.
What's the proper way to pass -mcpu flag to clang?

[soulthreads]

Welp, it looks like #4784 and #4584 are exactly about this problem. Sorry for the noise.