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Nix: Eigen 5 #35

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@nim65s nim65s commented Dec 19, 2025

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flake.lock: Update
c54cc26 
Flake lock file updates:

• Updated input 'flake-parts':
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  → 'github:hercules-ci/flake-parts/a34fae9c08a15ad73f295041fec82323541400a9?narHash=sha256-XswHlK/Qtjasvhd1nOa1e8MgZ8GS//jBoTqWtrS1Giw%3D' (2025-12-15)
• Updated input 'flake-parts/nixpkgs-lib':
    'github:nix-community/nixpkgs.lib/0f36c44e01a6129be94e3ade315a5883f0228a6e?narHash=sha256-zvaMGVn14/Zz8hnp4VWT9xVnhc8vuL3TStRqwk22biA%3D' (2025-07-27)
  → 'github:nix-community/nixpkgs.lib/2075416fcb47225d9b68ac469a5c4801a9c4dd85?narHash=sha256-k00uTP4JNfmejrCLJOwdObYC9jHRrr/5M/a/8L2EIdo%3D' (2025-12-14)
• Updated input 'nixpkgs':
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  → 'github:NixOS/nixpkgs/cd81579bbcc2d6885fa0c5cf8416e3bf8bf3e27e?narHash=sha256-Rj6PPGGhYdlKWqYyqZmFHgUs5i2KEVq/zpHHwp4kR9A%3D' (2025-12-19)
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ManifoldFR commented Dec 19, 2025

This PR's title just made my week!

@ManifoldFR ManifoldFR enabled auto-merge December 19, 2025 13:50
@nim65s nim65s disabled auto-merge December 19, 2025 14:27
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nim65s commented Dec 19, 2025

Hum, sorry, I forgot to set a correct title 😅

@nim65s nim65s changed the title Eigen 5 Nix: Eigen 5 Dec 19, 2025
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nim65s commented Dec 19, 2025 •
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Its point is mostly to start discussions about eigen 5 issues in nanoeigenpy:

       > /nix/var/nix/builds/nix-1966-3789542766/source/include/nanoeigenpy/decompositions/sparse/sparse-lu.hpp:132:63: error: no viable conversion from returned value of type 'SparseLUMatrixUReturnType<[...], Map<SparseMatrix<Scalar, ColMajor, StorageIndex>>>' to function return type 'SparseLUMatrixUReturnType<[...], MappedSparseMatrix>'
       >   132 |           "matrixU", [](const Solver &self) -> UType { return self.matrixU(); },
       >       |                                                               ^~~~~~~~~~~~~~

Because I was going to add eigen 5 in coal CI, as it is ok with eigenpy, but the nanoeigenpy bindings are not ready yet

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ManifoldFR commented Dec 19, 2025

Its point is mostly to start discussions about eigen 5 issues in nanoeigenpy:

       > /nix/var/nix/builds/nix-1966-3789542766/source/include/nanoeigenpy/decompositions/sparse/sparse-lu.hpp:132:63: error: no viable conversion from returned value of type 'SparseLUMatrixUReturnType<[...], Map<SparseMatrix<Scalar, ColMajor, StorageIndex>>>' to function return type 'SparseLUMatrixUReturnType<[...], MappedSparseMatrix>'
       >   132 |           "matrixU", [](const Solver &self) -> UType { return self.matrixU(); },
       >       |                                                               ^~~~~~~~~~~~~~

Because I was going to add eigen 5 in coal CI, as it is ok with eigenpy, but the nanoeigenpy bindings are not ready yet

Okay, that's an intricate return type conversion problem (or rather, the types in question are intricate). We'll look into this.

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