Eigen Wiki Question

[Levi-Armstrong]

Hello,

Your wiki on Eigen was very informative, but I have question you may be able to answer. It states that you must not link against libraries that were built using Eigen with different alignment optimization flags. For a system library how can you tell what flags were used? Also a lot of ROS package use Eigen do they all get build with the same alignment optimization flags on the ROS Build Farm?

[HannesSommer]

That is a good question.
I doubt there is a generic way to detect the build flags a given lib was build with. This is basically a fundamental problem with c++.
However, I would assume that most ROS packages that get built on the ROS build farm use the target's default config as determined by the compiler (see g++ -Q --help=target).

As long as you do the same you should be safe :).
If you must do differently you can compare with the output of the above command and reason about which other flags would lead to a compatible alignment.

[Levi-Armstrong]

Thank you, this is very helpful.