[Patch, fortran] Improve common function elimination

[Tobias Burnus]

Thomas Koenig wrote:
> --- dependency.c	(Revision 182430)
> +++ dependency.c	(Arbeitskopie)
> @@ -245,7 +245,9 @@ gfc_dep_compare_functions (gfc_expr *e1, gfc_expr
>      * 0 if e1 == e2
>      * -1 if e1<  e2
>      * -2 if the relationship could not be determined
> -   * -3 if e1 /= e2, but we cannot tell which one is larger.  */
> +   * -3 if e1 /= e2, but we cannot tell which one is larger.
> +   REAL and COMPLEX constants are only compared for equality
> +   or inequality; if they are unequal, -2 is returned in all cases.  */

Can we finally move to an ENUM? I think we slowly drift into the realm 
of magic numbers ...
(I know that you didn't modify that part.)

Steve Kargl wrote:
> On Wed, Dec 28, 2011 at 04:21:55PM +0100, Thomas Koenig wrote:
>>> OK for trunk?
> I did not test the patch, but it appears correct to me.
> OK.

Same here: Not tested, but it looks OK.

Tobias