This allows users to put zig in their `mkShell` without ending up with a
ZIG_GLOBAL_CACHE_DIR value set that points back to a location that only
would exist in the sandbox.
By moving the zig setup hook to the zig derivation itself, we allow for
zig to splice correctly with `callPackage`, meaning that the correct zig
can be pulled in during builds when zig is in `nativeBuildInputs` (for
example).
This change retains the `zig.hook` attribute for backward compatibility
by just pointing to the zig derivation. This also removes
`zig_default_flags`, since now the setup hook is not a derivation that
can be overridden. Overriding the build flags can now be done by setting
`dontSetZigDefaultFlags = true`.
This upgrades the default version of zig to zig_0_12, which builds
reproducibly on darwin.
Fixes#299091.
Also upgrades all packages compatible with zig 0.12 to that version.
I tried to upgrade packages currently pinning 0.11 as well, but only a
few worked.
Co-authored-by: Weijia Wang (wegank) <contact@weijia.wang>
Zig is still under active development, and new releases often introduce
breaking changes. This makes updating the default version of zig easier.
Some packages did not receive this change because they could be using
the c compiler or linker of zig, which doesn't receive as much breaking
changes compared to e.g. the zig std library.
https://github.com/NixOS/nixpkgs/pull/248243#discussion_r1289401340
