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From: sjw <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Record representation : components order
Date: Sun, 5 Jul 2009 03:16:05 -0700 (PDT)
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On Jul 5, 4:14=A0am, Hibou57 (Yannick Duch=EAne)
<yannick_duch...@yahoo.fr> wrote:

> N.B. pragma Convention is required when the C specs make use of some
> type whose size depends on some configuration. This is not convenient
> to use =93 at range =94 in this case. This is the reason of this thread.

No good telling the Ada compiler to use a size (or alignment, or ...)
that the C compiler only knows because of some #defines that are only
visible to the C compilation!

For tcladashell, I have a Tcl script which generates a C program which
generates an Ada spec (the reason for the Tcl script is that there are
at least 3 different kinds of definition required, for several
variables. I suppose I could have used C macros ...). Sample output:

package Tcl_Record_Sizes is

   --  Size macros defined in tcl.h.

   NUM_STATIC_TOKENS : constant :=3D 20;

   TCL_DSTRING_STATIC_SIZE : constant :=3D 200;

   --  Sizes of structs defined in tcl.h.

   Tcl_CallFrame_Size : constant :=3D 44;
   Tcl_CallFrame_Alignment : constant :=3D 4;