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Re: how to compile a program
- From: Tobias Burnus <burnus at net-b dot de>
- To: Eswari Natrajan <essu_n21 at yahoo dot co dot in>
- Cc: fortran at gcc dot gnu dot org
- Date: Fri, 09 Mar 2007 21:30:51 +0100
- Subject: Re: how to compile a program
- References: <20070309201423.29157.qmail@web8911.mail.in.yahoo.com>
Hi,
Eswari Natrajan wrote:
> I want to know what extension is use to save
> gfortran whether .f90 or .f and also how to compile
> program which is saved as filename.f?
gfortran supports both .f and .f90, but they mean something different.
If a file has the ".f" extension, gfortran assumes that the file is a
fixed-form source code, known from FORTRAN 77. For ".f90" (and ".f95"
and ".f03") it assumes free-form source code, which was introduced first
with Fortran 95.
If you have a free-form file which uses nonetheless ".f", one can use
"-ffree-form" to force the free-form mode.
And for completeness, if a file has the extensions ".F" or ".F90", the
file is run through CPP (the C preprocessor) before it is compiled.
Tobias