GNU Compiler options

[Dietrich]

Dear Colleagues,
I use the SuSe LINUX 7.1 with the GNU Fortran and C Compiler on a PC with a 32-bit processor.
The family of my Fortran and C codes requires a 64-bit arithmetic. The standard version of some codes is intrinsically single precision, and may be used on 64-bit processors, or on 32-bit processors whose compiler has an internal double-precision "switch". For example, on an IBM RS/6000 workstation with a 32-bit CPU, compilations should be made with the option "-qautodbl=dblpad" to obtain 64-bit arithmetic; on Sun and Solbourne workstation the same effect is achieved by specifying the "-r8" compiler option.
Please let me  know, whether it is possible to use a similar internal double-precision "switch" at the GNU Fortran and C Compiler in order to obtain the 64-bit arithmetic on a PC with a 32-bit processor.
Thank you very much for your cooperation.

With best regards
R. A. Dietrich

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Dr. rer. nat. Rudolf Adolf Dietrich
Institute for Coastal Research
GKSS Research Center Geesthacht GmbH
Max-Planck-Str.
D-21502 Geesthacht
Germany
Tel.  :+49-4152-87-1902
Fax  : +49-4152-87-1909
Email: Rudolf-Adolf.Dietrich@gkss.de