expand on the system type in hacking guide
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Valentin Gagarin
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3763c7bb5e
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4944e37ec0
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@ -7,12 +7,12 @@ AC_PROG_SED
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# Construct a Nix system name (like "i686-linux"):
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# https://www.gnu.org/software/autoconf/manual/html_node/Canonicalizing.html#index-AC_005fCANONICAL_005fHOST-1
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# The inital value is produced by the `config.guess` script:
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# https://git.savannah.gnu.org/cgit/config.git/tree/config.guess
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# The inital value is produced by the `config/config.guess` script:
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# upstream: https://git.savannah.gnu.org/cgit/config.git/tree/config.guess
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# It has the following form, which is not documented anywhere:
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# <cpu>-<vendor>-<os>[<version>][-<abi>]
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# If `./configure` is passed any of the `--host`, `--build`, `--target` options, the value comes from `config.sub` instead:
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# https://git.savannah.gnu.org/cgit/config.git/tree/config.sub
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# If `./configure` is passed any of the `--host`, `--build`, `--target` options, the value comes from `config/config.sub` instead:
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# upstream: https://git.savannah.gnu.org/cgit/config.git/tree/config.sub
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AC_CANONICAL_HOST
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AC_MSG_CHECKING([for the canonical Nix system name])
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@ -110,41 +110,72 @@ You can also build Nix for one of the [supported platforms](#platforms).
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## Platforms
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As specified in [`flake.nix`], Nix can be built for various platforms:
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- `aarch64-linux`
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- `i686-linux`
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- `x86_64-darwin`
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- `x86_64-linux`
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Nix can be built for various platforms, as specified in [`flake.nix`]:
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[`flake.nix`]: https://github.com/nixos/nix/blob/master/flake.nix
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- `x86_64-linux`
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- `x86_64-darwin`
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- `i686-linux`
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- `aarch64-linux`
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- `aarch64-darwin`
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- `armv6l-linux`
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- `armv7l-linux`
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In order to build Nix for a different platform than the one you're currently
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on, you need to have some way for your system Nix to build code for that
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platform. Common solutions include [remote builders] and [binfmt emulation]
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on, you need a way for your current Nix installation to build code for that
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platform. Common solutions include [remote builders] and [binary format emulation]
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(only supported on NixOS).
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[remote builders]: ../advanced-topics/distributed-builds.md
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[binfmt emulation]: https://nixos.org/manual/nixos/stable/options.html#opt-boot.binfmt.emulatedSystems
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These solutions let Nix perform builds as if you're on the native platform, so
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executing the build is as simple as
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```console
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$ nix build .#packages.aarch64-linux.default
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```
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for flake-enabled Nix, or
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Given such a setup, executing the build only requires selecting the respective output attribute.
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For example, to compile for `aarch64-linux`:
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```console
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$ nix-build --attr packages.aarch64-linux.default
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```
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for classic Nix.
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or for Nix with the [`flakes`] and [`nix-command`] experimental features enabled:
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You can use any of the other supported platforms in place of `aarch64-linux`.
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```console
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$ nix build .#packages.aarch64-linux.default
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```
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Cross-compiled builds are available for ARMv6 and ARMv7, and Nix on unsupported platforms can be bootstrapped by adding more `crossSystems` in `flake.nix`.
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Cross-compiled builds are available for ARMv6 (`armv6l-linux`) and ARMv7 (`armv7l-linux`).
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Add more [system types](#system-type) to `crossSystems` in `flake.nix` to bootstrap Nix on unsupported platforms.
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## System type
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Nix uses a string with he following format to identify the *system type* or *platform* it runs on:
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```
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<cpu>-<os>[-<abi>]
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```
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It is set when Nix is compiled for the given system, and based on the output of [`config.guess`](https://github.com/nixos/nix/blob/master/config/config.guess) ([upstream](https://git.savannah.gnu.org/cgit/config.git/tree/config.guess)):
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```
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<cpu>-<vendor>-<os>[<version>][-<abi>]
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```
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When Nix is built such that `./configure` is passed any of the `--host`, `--build`, `--target` options, the value is based on the output of [`config.sub`](https://github.com/nixos/nix/blob/master/config/config.sub) ([upstream](https://git.savannah.gnu.org/cgit/config.git/tree/config.sub)):
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```
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<cpu>-<vendor>[-<kernel>]-<os>
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```
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For historic reasons and backward-compatibility, some CPU and OS identifiers are transformed as follows in [`configure.ac`](https://github.com/nixos/nix/blob/master/config/config.sub):
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| `config.guess` | Nix |
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|----------------------------|---------------------|
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| `amd64` | `x86_64` |
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| `i*86` | `i686` |
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| `arm6` | `arm6l` |
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| `arm7` | `arm7l` |
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| `linux-gnu*` | `linux` |
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| `linux-musl*` | `linux` |
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## Compilation environments
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