Samuel Dionne-Riel
857adb6674
The usage of NIX_CFLAGS_COMPILE was added in 2023, in commit
2a6b15d371.
When going back to that commit, removing the added flag, and
building with:
$ nix-build pkgsCross.aarch64-multiplatform.linuxPackages.nvidia_x11_beta_open
...the build fails.
With the current state of Nixpkgs, the build completes whether
or not the flag is used.
This *necessarily* has to be unneeded, as using kernelModuleMakeFlags and
the kernel's out-of-tree build tooling forces the unwrapped `cc` to be
used... *For `CC` uses*.
This situation may be a bit wonkier than the others, since `CXX` usage
is *not* affected by the (debatable?) regression. This can be observed
experimentally by setting `NIX_CFLAGS_COMPILE` to some bogus value that
won't work. The build will fail only when invoking the C++ compiler.
Context here: https://github.com/NixOS/nixpkgs/blame/f86e9fe549f551d6bb738a1d01efa7d61b2da3e7/pkgs/os-specific/linux/kernel/common-flags.nix#L10-L11
Nixpkgs is a collection of over 120,000 software packages that can be installed with the Nix package manager. It also implements NixOS, a purely-functional Linux distribution.
Manuals
- NixOS Manual - how to install, configure, and maintain a purely-functional Linux distribution
- Nixpkgs Manual - contributing to Nixpkgs and using programming-language-specific Nix expressions
- Nix Package Manager Manual - how to write Nix expressions (programs), and how to use Nix command line tools
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Nixpkgs and NixOS are built and tested by our continuous integration system, Hydra.
- Continuous package builds for unstable/master
- Continuous package builds for the NixOS 25.11 release
- Tests for unstable/master
- Tests for the NixOS 25.11 release
Artifacts successfully built with Hydra are published to cache at https://cache.nixos.org/. When successful build and test criteria are met, the Nixpkgs expressions are distributed via Nix channels.
Contributing
Nixpkgs is among the most active projects on GitHub. While thousands of open issues and pull requests might seem like a lot at first, it helps to consider it in the context of the scope of the project. Nixpkgs describes how to build tens of thousands of pieces of software and implements a Linux distribution. The GitHub Insights page gives a sense of the project activity.
Community contributions are always welcome through GitHub Issues and Pull Requests.
For more information about contributing to the project, please visit the contributing page.
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Nixpkgs is licensed under the MIT License.
Note
MIT license does not apply to the packages built by Nixpkgs, merely to the files in this repository (the Nix expressions, build scripts, NixOS modules, etc.). It also might not apply to patches included in Nixpkgs, which may be derivative works of the packages to which they apply. The aforementioned artifacts are all covered by the licenses of the respective packages.