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From: Simon Wright <simon.j.wright@mac.com>
Newsgroups: comp.lang.ada
Subject: Re: Implementing an Ada compiler and libraries.
Date: Thu, 10 May 2007 21:31:28 +0100
Organization: Pushface
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Date: 2007-05-10T21:31:28+01:00
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Stefan Bellon <sbellon@sbellon.de> writes:

> Ludovic Brenta wrote:
>
>> Stefan Bellon writes:
>
>> > But timestamps are considered as well. If you touch a file without
>> > modifying it otherwise, it triggers a recompilation.
>> 
>> Not in my experience.  Changing the timestamp causes a recalculation
>> of the checksum, that's all.  Even after adding whitespace or
>> pretty-printing the file, there is no recompilation.
>
> Hmmmm:
>
> bellonsn@cube$ gnatmake foo.adb
> gnatmake: "foo" up to date.
> bellonsn@cube$ touch foo.adb    
> bellonsn@cube$ gnatmake foo.adb
> gcc -c foo.adb
> gnatbind -x foo.ali
> gnatlink foo.ali

This is the gnatmake -m flag:
   if the timestamp hasn't changed: do nothing
   elif the semantic content of the file hasn't changed: do nothing
   else: recompile