Using zig build's QEMU integration?

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1

I see that zig build -h shows the options -fqemu and -fno-qemu:

Integration with system-installed QEMU to execute
foreign-architecture programs on Linux hosts
(default: no)

The flag will let my tests run when I cross-compile, so it seems to be working. I have questions:

Is the functionality documented anywhere?
Does anyone have any experience using it?
What does it change compared to just building for the emulated platform?

2

It is using QEMU only when you run cross-compiled build artifacts (tests and executable). You can also use wine to run Windows artifacts and darling to run macOS artifacts.

enable_qemu in std.Build:

Use system QEMU installation to run cross compiled foreign architecture build artifacts.

and in zig build --help:

-fqemu,   -fno-qemu      Integration with system-installed QEMU to execute
                         foreign-architecture programs on Linux hosts
                         (default: no)
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