OpenMP is enabled whenever it is found in the system

[ilyapopov]

In CmakeLists.txt, if OpenMP is found on the system, it is unconditionally enabled:

https://github.com/ddemidov/amgcl/blob/c71ab45f911771c108b1842ea7cd11b62432bbf3/CMakeLists.txt#L60-L68

However, I may want to compile my application without OpenMP even though it is installed. Currently, there is no way to do that.

amgcl could define a CMake option to enable/disable use of OpenMP.

[ddemidov]

That is a good point, but I am currently away from keyboard for about two weeks, and so won't be able to implement it right away. I'll gladly accept a pull request though.

[ilyapopov]

No problem! I will try to make a PR in the coming days.