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...============ The GNU compilers have never implemented the exact Fortran standards: g77 was said to be a 'GNU Fortran' compiler, and gfortran has '--std=legacy'. So they are not a good check of portability. There is a comprehensive checker available at http://www.dsm.fordham.edu/~ftnchek/ . This is picky, but does pick up the main portability problems I found: - the use of non-integer variables for array indices - naming variables with the names of builtin functions. - calling functions with the wrong argument type. gfortran -Wall does warn on the first and you will see example...