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https://github.com/rhys-t/nix-fpc-test
https://github.com/rhys-t/nix-fpc-test
Last synced: about 1 month ago
JSON representation
- Host: GitHub
- URL: https://github.com/rhys-t/nix-fpc-test
- Owner: Rhys-T
- Created: 2024-10-31T14:21:54.000Z (about 2 months ago)
- Default Branch: master
- Last Pushed: 2024-10-31T14:36:29.000Z (about 2 months ago)
- Last Synced: 2024-10-31T15:30:05.500Z (about 2 months ago)
- Language: Nix
- Size: 3.91 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
Awesome Lists containing this project
README
# NixOS/nixpkgs#352655: `fpc` seems to bypass the linker wrapper on certain macOS machines, even with the same `.drv`
### Describe the bug
Derivations I've written that use the Free Pascal compiler `fpc` build successfully on my local machine (`x86_64-darwin`, macOS 10.15.7), but when I try to build them on GitHub Actions using the `macos-13` runner, the linker outputs various warnings and errors that don't happen locally, and the build fails.
```
ld: warning: -multiply_defined is obsolete
-macosx_version_min has been renamed to -macos_version_min
ld: warning: ignoring duplicate libraries: '-lc'
ld: library 'm' not found
An error occurred while linking
```
The really weird part is that the derivation is evaluating to an identical (both name and content) `.drv` file on both my Mac and the GitHub runner, so it _should_ be an identical build environment.
Examining the log closer, I see no evidence that the linker wrapper is being called in the GitHub case. There are no references to `ld-params.XXXXXX` tempfiles in its build log, only `cc-params.XXXXXX` ones. The local log has both. And the arguments that `ld` is complaining about aren't mentioned anywhere in GitHub's version of the log, but they're present locally.
### Steps To Reproduce
Steps to reproduce the behavior:
1. Clone [Rhys-T/nix-fpc-test](https://github.com/Rhys-T/nix-fpc-test) on an Intel Mac. It contains two Nix files:
- `fpc-test.nix` builds a simple Hello World program using Free Pascal, which links in `libm` (and doesn't really do anything with it.)
- `c-test.nix` is basically the same thing, but in C. It also links `libm`.
2. Build each program with NIX_PATH='nixpkgs=https://github.com/NixOS/nixpkgs/archive/refs/heads/nixpkgs-unstable.tar.gz' nix-build lang-test.nix and test it.
3. Fork the repo on GitHub, and enable actions.
4. Trigger the "Test `fpc` inside Nix" workflow manually. A job will appear for each of the test files.
5. The C test will build successfully, but the Free Pascal one will fail with the errors I mentioned above.
6. The `.drv`s and build logs for both test programs will be uploaded as artifacts for the workflow.
7. Compare the `.drv`s with the ones from your local system. The names and contents should be identical.
### Expected behavior
Free Pascal programs should build identically on both my local system and GitHub - or at least fail identically.
### Screenshots
N/A
### Additional context
While my example derivations here have `NIX_DEBUG=7` set, the problem happens without that variable too.
I have no idea whether the problem is in Nix, Nixpkgs, `fpc`, GitHub, [cachix/install-nix-action](https://github.com/cachix/install-nix-action), or something else I haven't even considered, so I apologize if this is the wrong place to open this issue. About the only thing I've managed to eliminate is [the actual program I was originally trying to package](https://drl.chaosforge.org).
### Metadata
```
these 3 paths will be fetched (1.07 MiB download, 6.70 MiB unpacked):
/nix/store/zymw9938w9c3wf0n5890mhlklb3cvqx6-DarwinTools-1
/nix/store/ci1awvn1fa7wi13pf6rc0603hcg64sg3-bash-interactive-5.2p32
/nix/store/rhkzkb6srxrs2ikvr96g3pz02nl1hjfd-nix-info
copying path '/nix/store/ci1awvn1fa7wi13pf6rc0603hcg64sg3-bash-interactive-5.2p32' from 'https://cache.nixos.org'...
copying path '/nix/store/zymw9938w9c3wf0n5890mhlklb3cvqx6-DarwinTools-1' from 'https://cache.nixos.org'...
copying path '/nix/store/rhkzkb6srxrs2ikvr96g3pz02nl1hjfd-nix-info' from 'https://cache.nixos.org'...
- system: `"x86_64-darwin"`
- host os: `Darwin 19.6.0, macOS 10.15.7`
- multi-user?: `yes`
- sandbox: `no`
- version: `nix-env (Nix) 2.24.9`
- channels(root): `"nixpkgs"`
- nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixpkgs`
```
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