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From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Newsgroups: comp.lang.ada
Subject: Re: Why are Ada compilers difficult to write ?
Date: Wed, 20 Jun 2018 17:54:21 +0200
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Xref: reader02.eternal-september.org comp.lang.ada:53207
Date: 2018-06-20T17:54:21+02:00
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On 06/19/2018 11:33 PM, Vincent wrote:
> 
> I have often heard that Ada compilers where expensive because they are very difficult to write, compared to Pascal or C ones. So my question is : what in the Ada language poses problem to a compiler ? What are the challenges ? Where can I find documentation about that ?

Compared to single-file, sequential languages like Pascal or C, Ada has

* Packages
* Tasks
* Protected types and objects
* Generics
* Tagged types
* Interfaces
* Discriminants
* Elaboration
* Finalization
* Overloading
* Separate compilation with cross-unit checking
* Indefinite types

and no doubt others I haven't thought of, so hardly any difference at all.

-- 
Jeff Carter
"Brave Sir Robin ran away."
Monty Python and the Holy Grail
59