Question about source file location when one uses #line 1 "example2.in" directive

[Steve Kargl]

On Wed, Apr 19, 2017 at 04:18:28PM +0200, Martin Liška wrote:
> prefix is parsed. To be honest, I'm not able to compile a pre-processed Fortran file:
> 
> $ gfortran example2.f90 --coverage -cpp  -E > example.f

> 
> $ gfortran example.f --coverage
> example2.in:6:1:
> 
>   PROGRAM example2
>   1
> Error: Non-numeric character in statement label at (1)
> example2.in:6:1:

You need to understand the filename suffix convention.
A filename ending in .f is assumed to be in fixed-form
format.  A filename ending in .f90 is in free-form
format.  See the gfortran for a complete description
of the filename convention.  If the output of your
first command line does not conform to the fixed-form
format for .f (or free-form format for .f90), then 
gfortran will chock with your second command line.

-- 
Steve
20161221 https://www.youtube.com/watch?v=IbCHE-hONow