Example nix shell

It is not clear how to use this library. Is this the correct way:

let
  pkgs = import <nixpkgs> {};
  fenix = pkgs.callPackage "${
      fetchTarball "https://github.com/nix-community/fenix/archive/main.tar.gz"
    }/packages.nix" { };
in
  pkgs.mkShell {
    buildInputs = [
      fenix.default.rustc
    ];
  }

This nix shell produces the following error: https://gist.github.com/fctorial/5a7257a1c6a450802e55c590f3f2c4e1

[figsoda]

should be fixed by f247696

@figsoda Yes that error is gone. Can you tell me how to add support for x86_64-linux-musl target?

[figsoda]

There is a cross compiling with naersk example in the examples section. The example is targetting aarch64-unknown-linux-gnu, but targeting x86_64-unknown-linux-musl would be pretty similar except you don't need to configure the linker.

If you just want to use it with nix shell,

with fenix; # or rust-nightly if you are using the overlay, or fenix.packages.x86_64-linux if you are using flakes
combine [
  minimal.rustc
  minimal.cargo
  targets.x86_64-unknown-linux-musl.latest.rust-std
]

should work

@figsoda I tried it and the executables built using this config are crashing with segmentation fault:

$ cat shell.nix
let
  pkgs = import <nixpkgs> {};
  fenix = import "${
      fetchTarball "https://github.com/nix-community/fenix/archive/main.tar.gz"
    }/packages.nix";
in
  pkgs.mkShell {
    buildInputs = [
      (with fenix;
      combine [
        minimal.rustc
        minimal.cargo
        targets.x86_64-unknown-linux-musl.latest.rust-std
      ])
    ];
  }
$ nix-shell

[nix-shell:~/src/pgs/sql]$ cargo new app
     Created binary (application) `app` package

[nix-shell:~/src/pgs/sql]$ cd app

[nix-shell:~/src/pgs/sql/app]$ cargo run --target=x86_64-unknown-linux-musl
   Compiling app v0.1.0 (/home/fctorial/src/pgs/sql/app)
    Finished dev [unoptimized + debuginfo] target(s) in 0.24s
     Running `target/x86_64-unknown-linux-musl/debug/app`
Segmentation fault (core dumped)

[nix-shell:~/src/pgs/sql/app]$

[figsoda]

Not sure what the problem is

It worked on my machine

~/hello
❯ cargo init
     Created binary (application) package

~/hello on  main [?]
❯ nix-shell
these 3 derivations will be built:
  /nix/store/3l6bam1py5v2gy173yqqjzdmayk41pnm-rustc-nightly-with-std-2021-04-30.drv
  /nix/store/cmgbhxa1sj80x78bk1y47a52g10li5mp-rust-std-nightly-2021-04-30.drv
  /nix/store/9wpfxn390nq3m5qd6jarkr4yrhi9znh4-rust-nightly-mixed.drv
these 3 paths will be fetched (90.96 MiB download, 418.95 MiB unpacked):
  /nix/store/57pxaivl23abqbn1wismqlf6vyl6diiz-cargo-nightly-2021-04-30
  /nix/store/fr97y4fx7abiczx7f3ivvclybz65js24-rust-std-nightly-2021-04-30
  /nix/store/qlcvwqc7hrpa2v5v8i0f42qjbhqqa8qc-rustc-nightly-2021-04-30
copying path '/nix/store/fr97y4fx7abiczx7f3ivvclybz65js24-rust-std-nightly-2021-04-30' from 'https://nix-community.cachix.org'...
copying path '/nix/store/57pxaivl23abqbn1wismqlf6vyl6diiz-cargo-nightly-2021-04-30' from 'https://nix-community.cachix.org'...
copying path '/nix/store/qlcvwqc7hrpa2v5v8i0f42qjbhqqa8qc-rustc-nightly-2021-04-30' from 'https://nix-community.cachix.org'...
building '/nix/store/cmgbhxa1sj80x78bk1y47a52g10li5mp-rust-std-nightly-2021-04-30.drv'...
unpacking sources
unpacking source archive /nix/store/pqy93a24zrflyzzjr1kmrw5i79i659za-rust-std-nightly-x86_64-unknown-linux-musl.tar.gz
source root is rust-std-nightly-x86_64-unknown-linux-musl
setting SOURCE_DATE_EPOCH to timestamp 1619729013 of file rust-std-nightly-x86_64-unknown-linux-musl/version
patching sources
configuring
no configure script, doing nothing
building
no Makefile, doing nothing
installing
patching script interpreter paths in install.sh
install.sh: interpreter directive changed from "#!/bin/bash" to "/nix/store/68c5b0h2w2ab57sbas1b4m073ik8hlm5-bash-4.4-p23/bin/bash"
install: creating uninstall script at /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/uninstall.sh
install: installing component 'rust-std-x86_64-unknown-linux-musl'

    rust std installed.

patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
post-installation fixup
shrinking RPATHs of ELF executables and libraries in /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30
shrinking /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/x86_64-unknown-linux-musl/lib/libstd-3b4724f13fd9b314.so
shrinking /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/x86_64-unknown-linux-musl/lib/libtest-3661a07a52ba28ac.so
shrinking /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/crtn.o
patchelf: wrong ELF type
shrinking /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/Scrt1.o
patchelf: wrong ELF type
shrinking /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/rcrt1.o
patchelf: wrong ELF type
shrinking /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/crtbeginS.o
patchelf: wrong ELF type
shrinking /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/crtbegin.o
patchelf: wrong ELF type
shrinking /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/crtend.o
patchelf: wrong ELF type
shrinking /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/crti.o
patchelf: wrong ELF type
shrinking /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/crt1.o
patchelf: wrong ELF type
shrinking /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30/lib/rustlib/x86_64-unknown-linux-musl/lib/self-contained/crtendS.o
patchelf: wrong ELF type
patching script interpreter paths in /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30
checking for references to /build/ in /nix/store/gadih0crhgq40x8hcd7gz8qxwiysywvl-rust-std-nightly-2021-04-30...
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
patchelf: wrong ELF type
building '/nix/store/3l6bam1py5v2gy173yqqjzdmayk41pnm-rustc-nightly-with-std-2021-04-30.drv'...
building '/nix/store/9wpfxn390nq3m5qd6jarkr4yrhi9znh4-rust-nightly-mixed.drv'...

[nix-shell:~/hello]$ cargo run --target x86_64-unknown-linux-musl
   Compiling hello v0.1.0 (/home/figsoda/hello)
    Finished dev [unoptimized + debuginfo] target(s) in 2.42s
     Running `target/x86_64-unknown-linux-musl/debug/hello`
Hello, world!

[figsoda]

Seems like nixos or musl issue:
rust-lang/rust#74757
rust-lang/rust#81987
NixOS/nixpkgs#94228