Add macOS to the automated testing

[heikef]

It would be nice for Mac users if gimic could be operating on a Mac.

[bast]

We should add a macOS test on Travis for this.

[heikef]

During a new attempt to install gimic on my Mac I ended up doing a cleanup of unused code. Afterwards I was able to compile. The problem with the Mac is the library mess.

[heikef]

The following was helpful in my case:

1. use Anaconda and install everything needed in requirements.txt
2. gfortran, gcc, g++ have to be in /usr/local/bin/
3. in the .bashrc I had to add:

for the compilers:

export PATH="/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"

for Anaconda:

export PATH=/Users/my_username:/Users/my_username/anaconda/bin:$PATH

for CMake:

PATH="/Applications/CMake.app/Contents/bin":"$PATH"

[heikef]

I tried several things using MacPorts and Brew and XCode. The main problem was to set the PATH correct such that gimic cmake finds what it should. I am sure there are better solutions possible compared to the one which worked for me.

[heikef]

The setup --omp stuff was also working, but not the --blas option. This is because it does not find the Blas and Lapack libraries. Any idea on how to install them on a Mac + make it work for gimic?

[heikef]

By the way I used Anaconda 2.

[heikef]

I was thinking about this issue. Is it really a good idea to support different operating systems? Should we not instead concentrate on improving gimic?

[bast]

But users install GIMIC also on macOS so the automated testing will hopefully help us to make GIMIC more robust also for macOS.

[heikef]

Does this imply we include automated testing for Mac on TravisCI but this will not affect other non-Mac users when installing the code on their local machines?

[bast]

Right.

[heikef]

Cool, but how do we do this?