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From: Stephen Leake <stephen_leake@stephe-leake.org>
Newsgroups: comp.lang.ada
Subject: Re: chopping Ada source that have preprocessor symbols in them
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Date: Fri, 15 Feb 2013 05:40:52 -0500
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Date: 2013-02-15T05:40:52-05:00
List-Id: <comp.lang.ada>

Georg Bauhaus <rm.dash-bauhaus@futureapps.de> writes:

> On 09.02.13 03:51, Stephen Leake wrote:
>> You have a file in CM:
>>
>> a_file.ada.gp
>>
>> It needs to be processed by gnatprep, then by gnatchop, and finally by
>> gprbuild.
>
> The problem is that running the chain of tools again and again is
> prohibitively inefficient.  It boils down to recompiling the world
> after each edit.
>
> The full picture is this: I am given, and will give back, a file,
>
> a_file.ada.gp
>
> It has about two dozen compilation units in it, some of them have many
> generic instantiations that will keep the compiler busy. I need to
> edit just some unit and then compile the program again.
>
> There are two "configurations", C1, and C2. Starting in C1,
> suppose I first run gnatprep on a_file.ada.gp, then gnatchop the
> preprocessed output. The two steps will produce about two dozen files.
> I can then call gnatmake as usual.

This is _precisely_ why the GNAT policy is one compilation unit per
file.

The root cause of your problem is putting more than one compilation unit
in one file. 

Change that.

Or get a faster computer; I hardly notice the time to compile a dozen
files.

-- 
-- Stephe