CMake instructions for downloading Eigen

[vaithak]

For #114

[vissarion]

Looks cool, thanks!

For which versions of eigen is this working? It seems that circleci tests are failing.

[TolisChal]

Nice PR, thanks!

[vaithak]

@vissarion It is working with the latest stable release of Eigen, i.e 3.3.9.
I checked the details of CircleCI build failure, the reason is that the FetchContent module of CMake is available in version >= 3.11, and the CMake version used in CircleCI is 3.7.2.
I have updated the CMakeLists.txt to require a minimum version of 3.11.
Is it possible to update the CMake on CircleCI?

[vaithak]

@vissarion CircleCI test is still failing because of the CMake version, can we add instructions to build the latest version in CircleCI rather than installing it from apt-get?

[vissarion]

@vissarion CircleCI test is still failing because of the CMake version, can we add instructions to build the latest version in CircleCI rather than installing it from apt-get?

I updated the circleci script, let's see if this fixes your problem (you have to merge with current develop). Otherwise, feel free to propose a change in the circleci script (inside this PR) that make the tests passing.

[vaithak]

@vissarion CircleCI test is still failing because of the CMake version, can we add instructions to build the latest version in CircleCI rather than installing it from apt-get?

I updated the circleci script, let's see if this fixes your problem (you have to merge with current develop). Otherwise, feel free to propose a change in the circleci script (inside this PR) that make the tests passing.

Yup, the circleci test is passing now, I hope this can be merged now 😅

[pradeexsu]

nice, I got an idea for lpsolve library

[pradeexsu]

it's fine