CLANG vs GCC tests of fortran/f2c program

[Wojciech Puchar]

> 
> 
> Yes Wojciech, I can attempt an answer for you.  Pay attention, this gets very complex.
> The decision to move to Clang was motivated by what is best for the project, and not what is best for Wojciech.
still not stopped personal attacks (last part of last sentence) but lets 
forget.

So please give an answer - not summary.