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From: gdemont@my-deja.com
Subject: Re: WinNT ADA compilers comparison
Date: 2000/08/02
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Date: 2000-08-02T00:00:00+00:00
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Nicolas BRUNOT:

> Platform is WinNT 4 with Gnat 3.12p
> we tried a lot of optimisation, strip etc ...

Did you avoid inlining (-gnatn or -gnatN) too ?
A solution would be to share more instanciations of generics
e.g. having common subtypes. Create 1-line packages for those
generic ones used many times:
"with such_generic; package such_inst is new such_generic(x,y,z);"
If there are many main procedures p1, p2,...
(-> several linked executables p1.exe, p2.exe)
using almost the same packages, shell them through a common one
"with p1,p2,...; procedure p is..."

> In comparison to others compilers (not only Alsys ADA83) Gnat produces
> incredibly huge executables when you make intensive use of generics
> (using a lot of generics is a quite normal and desirable thing in ADA
> according to us)
>
> We of course use generics (and generics of generics ....) which is may
> be one of the most important and powerful ADA features, allowing you
> not spending your time writing more or less the same code, and keep
> strong compiler check.
>
> reaching sizes of more than 40 or 50 Mo start to be a real inconvenient
> when others compilers are 4 or 5 times smaller

And what makes you unhappy with the Ada95 compilers other than GNAT ?

G.


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