REAL_KINDS: a compilation error in Windows but not in Linux ?

[Jorge D'ELIA]

Tobias / Jerry,

Many thanks for your answers.


(1/2) for Tobias:

> > C:\Users\TEST\gfortran -Wall -std=f2003 -c m_test.f90
> > m_test.f90:6.29:
> >
> >    integer, parameter :: isp = REAL_KINDS (1)
> >                               1
> > Error: Function 'real_kinds' at (1) has no IMPLICIT type
> 
> The error makes perfectly sense: REAL_KINDS is a Fortran 2008 feature. 
> thus Fortran 2003's ISO_FORTRAN_ENV does not contain this symbol. 

OK. I was not aware of this difference between Fortran 2003 and Fortran 2008.

> Try compiling with -std=f2008.

The compilation is now successful with the flag -std=f2008.

> If you had used ONLY, the error message would have helped a bit more:
> 
> use ISO_FORTRAN_ENV, only: real_kinds
> 1
> Error: The symbol 'real_kinds', referrenced at (1), is not in the
> selected standard

Nevertheless, it is somewhat surprising that, for the same compiler 
version (4.7.0), this error appears using the wrong flag -std=f2003 
only when it is compiled in Windows, and not in Linux.



(1/2) for Jerry:

> Are you using mingw? 

No, the windows version of the compiler was downloaded from:

http://users.humboldt.edu/finneyb/gfortran-windows-20110419.exe

> Do you have control characters embedded in your source file?

Not that I know. The original code is developed in Linux and has 
numerical oriented. For portability, the code is recompiled on 
windows often.


Regards,
Jorge.
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