[Nelson-numerical-software]

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[Copilot]

Pull Request Overview

This PR aims to add support for using Eigen 5.0.0 when detected, adjusting the CMake configuration and documenting the change in the changelog.

• Relaxes CMake Eigen find logic and adds a manual version check
• Updates CHANGELOG to mention Eigen 5.0.0 support

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
CMakeLists.txt	Replaces explicit versioned find_package with a manual post-find version check and status message
CHANGELOG.md	Notes detection/use of Eigen 5.0.0

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[Copilot]

This no longer reliably enforces the minimum Eigen version. If the package does not define Eigen3::Eigen (older Eigen/cmake setups) or does not set Eigen3_VERSION, the version check is skipped and find_package(Eigen3 REQUIRED) may succeed with an unsupported Eigen (< 3.3). Prefer letting CMake enforce the minimum version directly: find_package(Eigen3 3.3 REQUIRED). If you want to print the detected version, you can do so after a successful find using Eigen3_VERSION or EIGEN3_VERSION_STRING without gating the check on TARGET.

Suggested change

	find_package(Eigen3 REQUIRED)
	if (TARGET Eigen3::Eigen)
	if (DEFINED Eigen3_VERSION)
	if (Eigen3_VERSION VERSION_LESS "3.3")
	message(FATAL_ERROR "Eigen3 version must be >= 3.3, found ${Eigen3_VERSION}")
	else()
	message(STATUS "Eigen3 version ${Eigen3_VERSION} is supported.")
	endif()
	endif()
	find_package(Eigen3 3.3 REQUIRED)
	if (DEFINED Eigen3_VERSION)
	message(STATUS "Eigen3 version ${Eigen3_VERSION} is supported.")

[Copilot]

FindEigen3 historically exposes EIGEN3_VERSION_STRING (uppercase), while config-mode may expose Eigen3_VERSION. To be robust across both, prefer the built-in version constraint in find_package, or at minimum check both variables: if(DEFINED Eigen3_VERSION) ... elseif(DEFINED EIGEN3_VERSION_STRING) ... else() message(FATAL_ERROR ...).

[Copilot]

Use https for the GitHub link and remove the trailing space to match common changelog formatting: #1458: Eigen 5.0.0 used if detected.

Suggested change

	- [#1458](http://github.com/nelson-lang/nelson/issues/1458): Eigen 5.0.0 used if detected.
	- [#1458](https://github.com/nelson-lang/nelson/issues/1458): Eigen 5.0.0 used if detected.