Re: *entry and PR with same program as EXTPGM

On Wed, Apr 15, 2009 at 10:21 AM, Bob P. Roche <BRoche@xxxxxxxxxxxxxxxxx> wrote:

I'm not sure you can say there is an advantage, The program will run
either way. The only advantage I know, is you don't have to drop out of
free form to define the *entry parms. I like that they are at the top of
the program since I used to define my *entry parms in the INZSR subroutine
that was at the bottom of my programs, but I could have defined it first
in my 'C' specs, so that's not really an advantage.

Someone replied that you get the prototype checking when called from
another program using a prototype, But if I understand correctly, The
calling program verifies your callp to the prototype, nothing compares
that to the called programs prototype.

If the prototype is defined in a /COPY member and both the calling
program and the called program /COPY in the prototype, then there's
only one prototype and the compiler does indeed check the the PR
matches the PI in the called program.

HTH,
Charles