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From: Edward Fish <edward.r.fish@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Adress => Access: types for unchecked conversion have different
 sizes
Date: Sat, 12 Mar 2011 09:00:55 -0800 (PST)
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References: <op.vr8kbsndz25lew@macpro-eth1.krischik.com>
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Date: 2011-03-12T09:00:55-08:00
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On Mar 12, 8:08=A0am, "Martin Krischik" <krisc...@users.sourceforge.net>
wrote:
> Hello,
>
> I currently have another go at building GNAT for MAx OS X. the current =
=A0
> error message I am looking at is:
>
> {{{
> /Volumes/Daten/Developer/MacPorts/dports/lang/gnat-gcc/work/build/./gcc/x=
gcc =A0
> -B/Volumes/Daten/Developer/MacPorts/dports/lang/gnat-gcc/work/build/./gcc=
/ =A0
> -B/opt/local/x86_64-apple-darwin10/bin/ =A0
> -B/opt/local/x86_64-apple-darwin10/lib/ -isystem =A0
> /opt/local/x86_64-apple-darwin10/include -isystem =A0
> /opt/local/x86_64-apple-darwin10/sys-include =A0 =A0-c -g -O2 -m32 -fPIC =
=A0
> -pipe =A0-W -Wall -gnatpg -m32 =A0a-direct.adb -o a-direct.o
> a-direct.adb:676:13: warning: types for unchecked conversion have =A0
> different sizes
>
> }}}
>
> The code in question is:
>
> {{{
> =A0 =A0 =A0 =A0 =A0 declare
> =A0 =A0 =A0 =A0 =A0 =A0 =A0subtype Path_String is String (1 .. Filename_L=
en);
> =A0 =A0 =A0 =A0 =A0 =A0 =A0type =A0 =A0Path_String_Access is access Path_=
String;
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0function Address_To_Access is new
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Ada.Unchecked_Conversion
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0(Source =3D> Address,
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 Target =3D> Path_String_Access);
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0Path_Access : constant Path_String_Access :=3D
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Address_To_Acc=
ess (Filename_Addr);
>
> =A0 =A0 =A0 =A0 =A0 begin
> =A0 =A0 =A0 =A0 =A0 =A0 =A0Last :=3D Filename_Len;
> =A0 =A0 =A0 =A0 =A0 =A0 =A0Name (1 .. Last) :=3D Path_Access.all;
> =A0 =A0 =A0 =A0 =A0 end;
>
> }}}
>
> Strange. Anybody got an idea what went wrong here?
>
> And I wonder if some `for Address use` magic would not be more appropriat=
e =A0
> here.
>
> Regards
>
> Martin
> --
> Martin Krischik
> mailto://krisc...@users.sourceforge.nethttps://sourceforge.net/users/kris=
chik

You could try adding ALL to Path_String_Access; IIRC Access w/o the
ALL is a
fat-pointer (keeping info about the object) whereas the Access ALL is
a thin-
pointer (an address) in GNAT.