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From: Shark8 <onewingedshark@gmail.com>
Newsgroups: comp.lang.ada
Subject: Pascal Calling Convention
Date: Wed, 23 Mar 2011 14:37:55 -0700 (PDT)
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Date: 2011-03-23T14:37:55-07:00
List-Id: <comp.lang.ada>

I was looking around for a way to use the Pascal calling convention in
GNAT; particularly because I thought it might be nice to do the GUI-
stuff in good old Delphi 5 and the application itself in Ada. All
easily doable via DLL or, possibly, through the $L compiler directive
which specifies a .obj file to link to.

-- I found a utility to convert between .o and .obj; so that's not a
problem. Though if someone knows a way to
-- have GNAT emit .obj files instead of .o I'd like to hear it.

The problem comes with the conventions... I'd like to be able to
interface w/o using stdcall or cdecl calling convention and directly
use the Pascal calling convention within my Ada texts. According to
this page ( http://gcc.gnu.org/onlinedocs/gnat_ugn_unw/Stdcall-Calling-Convention.html
) the STDCALL convention *is* the Pascal calling convention; both are
callee clean-up of the stack however, according to wikipedia (and
http://www.swissdelphicenter.ch/torry/showcode.php?id=1233 ) there is
a difference: left-to-right vs. right-to-left parameter passing.

This could also be a good nugget of information if I decide to use BP7
to write an OS loader & runtime for that OS; I had an OS written in
BP7 to the point where it could display a command-line, read
[keyboard] commands, and change the display-mode... when trying to
port that code to Ada apparently it failed to load properly due to the
non-existent runtime's requirement.
{True, it would be limited to 32-bits; but there isn't going to be a
shortage of 32-bit CPUs for a while.}