Cargo will never need to link for the target platform — that'd be for
the package being built to do at runtime. Cargo should know about the
build and host linkers.
This fixes e.g. pkgsCross.musl64.fd from x86_64-linux.
Fixes: 67a4f828b4 ("rust: hooks: fix cross compilation")
This upgrade unfortunately removes MIPS support, as it has been
dropped to Tier 3[1] and so bootstrap tarballs are no longer provided.
It looks like it was dropped due to multiple codegen bugs, and lack of
maintenance, so bringing it back would probably involve engaging with
Rust/LLVM upstream on those.
[1]: https://github.com/rust-lang/compiler-team/issues/648
> If using a target spec JSON file, the <triple> value is the filename
> stem. For example --target foo/bar.json would match [target.bar].
- https://doc.rust-lang.org/cargo/reference/config.html#target
I've also exposed toRustTargetSpecShort as a public function, because
it's useful to be able to know what the target subdirectory will be.
Currently there is a state of severe confusion in
pkgs/build-support/rust/hooks/ regarding host vs target; right now
there is only "host" defined, but whether it means "host" or
"target" seems to fluctuate.
This commit corrects that, ensuring that all variables come in all
three flavors (build, host, target) and are used consistently with
the nixpkgs convention.
This also fixes the cross-compilation of packages which use
`maturinBuildHook` -- hooks go in `nativeBuildInputs` and are
phase-shifted backwards by one platform, so they need to be careful
about distinguishing between build and host.
Closes#247441
armv6l-linux was incorrectly added to the list of platforms without host
tools in #227987. arm-unknown-linux-gnueabihf is present in the list of
Tier 2 targets with host tools, and this target corresponds to our
armv6l-linux platform.
Members of the [package] table in Cargo.toml can be either subtables, or
values like strings and bools. Python is happy to check for membership
of "workspace" in a string, since Python strings are iterables, but if
the value is a bool, Python will throw an exception.
rustc supports way more platforms than Linux and Darwin. We might not
be able to build it for every platform at the moment, but that's what
meta.broken is for.
There are other platforms that rustc can produce binaries for, but
can't run on itself, so those are listed in the defaults for
buildRustPackage.
Without this PR, unlike `RUST_LIB_BACKTRACE=1 cargo run` you won't
get line numbers in backtraces from binaries built with:
```
nix build -f Cargo.nix --arg release false
```
This PR fixes that.
The build.rs script shipped with evdev-sys attempts to detect cross
compilation and uses a completely different codepath which does a
`git fetch` inside the build script. This doesn't work in nixpkgs.
This PR adds a `touch libevdev/.git` to trick the `build.rs` into
thinking that it is not necessary to do a `git fetch`.
Thanks to @figsoda for finding this more-elegant solution to the
problem (my original solution needed to patch `build.rs`):
https://github.com/NixOS/nixpkgs/pull/224893#pullrequestreview-1373809617
Tested on:
- [x] `aarch64-linux` (cross from `x86_64-linux`)
