[CMake] ccmake and fortran

[Arjen Markus]

> At 11:05 AM 8/14/2006, Arjen Markus wrote:
>
Bill,

>
> Right so, as far as comments go, we should have to care if it is free
> format or not. If it is fixed format then the only depends that it will
> have will come from the INCLUDE statement that must be at the start of
> the line.   And if we have a mistaken comment it can not hurt.
>

the situation is a bit more complicated:
- Fortran 90/95 still supports the fixed form, so people can
  write modules using fixed form. So it is important to recognise
  the two forms.
- The earlier solution to recognise comments should _not_ include
  d and D - these are used to hide debug statements. The compiler
  ignores them unless the right option is explicitly given.

So I think the solution should be:

- A file extension like .f or .for means fixed form, comments
  are recognised by the RE ^cC\*.*$ and by !.*$
- A file extension like .f90 means free form, comments are
  recognised exclusively by the RE !.*$

Hm, that could go wrong if someone uses file names with a ! in them,
like:
   include "my_what_a_name!.f"

though I doubt that will be an important case.

Regards,

Arjen