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From: Florian Weimer <fw@deneb.enyo.de>
Newsgroups: comp.lang.ada
Subject: Re: Only one Ada vendor?
Date: Sun, 21 Oct 2007 22:57:57 +0200
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* Simon Wright:

> "Nasser Abbasi" <nma@12000.org> writes:
>
>> If this was say C or C++ code full of #ifdefs and each C compiler
>> having its own set of a million different compiler switches I would
>> understand, but Ada code?  So I am just curious why would it be hard
>> to "switch" Ada compilers?
>
> Application code is very likely to depend on compiler-specific
> extensions and support packages; eg GNAT's 'Unrestricted_Access and
> GNAT.Sockets.

And compiler-specific time behavior of the run-time library.  If you
move an application which uses Ada.Strings.Unbounded heavily to a
compiler whose run-time library supports only a single-character Append
operation whose run-time is proportional to the string length,
performance might be completely unacceptable.