54 lines
1.6 KiB
Markdown
54 lines
1.6 KiB
Markdown
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# Hare {#sec-language-hare}
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## Building Hare programs with `hareHook` {#ssec-language-hare}
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The `hareHook` package sets up the environment for building Hare programs by
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doing the following:
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1. Setting the `HARECACHE`, `HAREPATH` and `NIX_HAREFLAGS` environment variables;
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1. Propagating `harec`, `qbe` and two wrapper scripts for the hare binary.
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It is not a function as is the case for some other languages --- *e. g.*, Go or
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Rust ---, but a package to be added to `nativeBuildInputs`.
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## Attributes of `hareHook` {#hareHook-attributes}
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The following attributes are accepted by `hareHook`:
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1. `hareBuildType`: Either `release` (default) or `debug`. It controls if the
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`-R` flag is added to `NIX_HAREFLAGS`.
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## Example for `hareHook` {#ex-hareHook}
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```nix
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{
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hareHook,
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lib,
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stdenv,
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}: stdenv.mkDerivation {
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pname = "<name>";
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version = "<version>";
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src = "<src>";
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nativeBuildInputs = [ hareHook ];
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meta = {
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description = "<description>";
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inherit (hareHook) badPlatforms platforms;
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};
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}
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```
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## Cross Compilation {#hareHook-cross-compilation}
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`hareHook` should handle cross compilation out of the box. This is the main
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purpose of `NIX_HAREFLAGS`: In it, the `-a` flag is passed with the architecture
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of the `hostPlatform`.
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However, manual intervention may be needed when a binary compiled by the build
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process must be run for the build to complete --- *e. g.*, when using Hare's
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`hare` module for code generation.
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In those cases, `hareHook` provides the `hare-native` script, which is a wrapper
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around the hare binary for using the native (`buildPlatform`) toolchain.
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