adaspark nix flake

This repo is a nix flake for providing an Ada and SPARK development environment. There are several (primary) components to this flake:

1. gnat, GNAT FSF for compiling Ada code. Because it is the FSF version, there are no runtime library license encumbrances. Includes commands gnatmake, gnatbind, gnatlink, gcc, g++, etc.
2. gpr, GNAT Project Manager, a common multi-project build tool for Ada or mixed Ada/C/C++ projects. Includes commands gprbuild, gprls, etc.
3. spark, the SPARK code verification tools. Includes gnatprove and gnat2why.
4. asis, the ASIS tools. Includes gnattest, gnatcheck, gnat2xml, gnat2xsd, gnatelim, gnatmetric, gnatpp, gnatstub.
5. alr, the Alire package manager.
6. adaspark target that includes 1-5. This is the default flake output and gives you everything you need to build an Ada project without using the nix build system to package it.
7. adaenv, a nix build environment like nix's stdenv, but modified so that derivations that are installed with gprbuild as buildInputs can be located in the nix store. It does this by setting GPR_PROJECT_PATH to certain nix store locations. gpr is automatically included in the environment and does not need to be specified in the buildInputs.

Other components are provided but typically aren't needed to be referenced directly in practice. Consult the flake source for more.

Enable flakes in nix

At the time of this writing, flakes are an experimental feature of nix. Please consult the flakes wiki entry for information on how to enable them.

Quickstart shell

You do not need to clone this repo to use it.

On the command line, run nix develop github:fluffynukeit/adaspark to build and/or activate a command line environment that includes gnat tools, asis tools, gpr, and SPARK. You can then use these tools with your own build or development scripts that are executed from the shell environment. Any other programs already installed on your system will still be accessible.

If you don't want all the components of the built-in adaspark environment (for instance, you don't care about SPARK and don't want to install it), you can specify individual flake components of your shell environment: nix develop github:fluffynukeit/adaspark#{gnat,gpr}

If you want a "pure" shell with nothing from your own system, add the -i flag to the nix command, which will include only those packages (and their dependencies) you specify. No installed programs from your own system will be accessible, not even ls! This is useful for verifying that the dependencies of your projects are all identified.

Quickstart flake

Example of how to use adaenv in a nix flake for a new project (forthcoming).