I really like your project. I do question its usefulness however. If you get any performance hit from using these, you beat the point of using Fortran (over say Python) in the first place :) Don't you think?
Yes, and having worked with Fortran code for years, we used the routines to calculate... and Python to analyze the data. A colleague even scrapped old Fortran routines in favor of Python + Numpy, as he could be more productive without a noticeable slowdown in his work, as the data analysis part was the bottleneck. So I reiterate my point: I like the project, I like the idea, but we need more information regarding the performance of the routines. Otherwise, using e.g. Python full-stack could be much less of a hassle.
Did you miss the point the OP just made above? Performance-critical code paths can be left alone while the usual set-up/tear-down code can make good use of this library.