From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me
X-Spam-Level: 
X-Spam-Status: No, score=-0.3 required=5.0 tests=BAYES_00,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Thread: a07f3367d7,e5006bbc2c63c1db
X-Google-Attributes: gida07f3367d7,public,usenet
X-Google-NewGroupId: yes
X-Google-Language: ENGLISH,ASCII-7-bit
Path: 
 g2news1.google.com!news3.google.com!proxad.net!feeder1-2.proxad.net!newsfeed.straub-nv.de!uucp.gnuu.de!newsfeed.arcor.de!newsspool3.arcor-online.net!news.arcor.de.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: GPS Compiler options
Newsgroups: comp.lang.ada
User-Agent: 40tude_Dialog/2.0.15.1
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Reply-To: mailbox@dmitry-kazakov.de
Organization: cbb software GmbH
References: <4bbf2806$0$19565$703f8584@news.kpn.nl>
 <b3cec394-937e-4911-9a67-a8213dfa0b3d@r36g2000yqm.googlegroups.com>
Date: Fri, 9 Apr 2010 16:26:05 +0200
Message-ID: <13txt3b8b77p5.upyewgdx7mkh.dlg@40tude.net>
NNTP-Posting-Date: 09 Apr 2010 16:26:05 CEST
NNTP-Posting-Host: 7011bf08.newsspool4.arcor-online.net
X-Trace: 
 DXC=CcMT=MYHZmIFJ3]dH>I?oE4IUK<Cl32<A4Fo<]lROoRA8kF<OcfhCOKK6El3@Cfi\M[6LHn;2LCVN[<mhadbfdUKfaeY88^?[:@2o3Ake\H9\I
X-Complaints-To: usenet-abuse@arcor.de
Xref: g2news1.google.com comp.lang.ada:9945
Date: 2010-04-09T16:26:05+02:00
List-Id: <comp.lang.ada>

On Fri, 9 Apr 2010 07:15:07 -0700 (PDT), Ludovic Brenta wrote:

> ldries46 wrote on comp.lang.ada:
>> I'm relatively new to GPS. I'm trying to compile a program but every time I
>> compile the program I observe that all units are compiled when I had
>> expected that only the unit I had altered would be compiled again. What do I
>> have to do to make this work. I alreday have tried all types of building of
>> the program.
> 
> The bug may be either in gnatmake or in your expectations; this
> depends on which unit you change.
> 
> If you change a spec, then all specs and all bodies that depend on the
> changed spec need to be recompiled.
> 
> If you change a generic body, then all specs and bodies that contain
> an instantiation of the generic body need to be recompiled (this is
> specific to GNAT, which does not share the object code between
> insiantiations of a generic).
> 
> If you change a file containing a "separate" unit, then the enclosing
> unit needs to be recompiled too, because GNAT emits only one object
> file containing the enclosing units and all "separate" bodies in it.
> 
> We could help you more if you would be more specific about the units
> in your program and on which units you changed.
> 
> PS. Maybe consider using the gnatmake -m switch ("minimal
> recompilation"); you do that by changing the project properties in
> GPS. With this option, gnatmake expends more effort trying to
> determine which units are still up to date.

Also, when the object and ali-files are on a remote server, usually
together with the sources (this is the case at my work), accessed over a
network file system (samba, NFS etc), then if the compiling computer has
the clock unsynchronized with the server, you may get the described effect
(or worse, non-compiled files).

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de