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From:	Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Huge differences in compilation time between gcc/gpp
Date:	10 Apr 2002 17:34:46 GMT
Organization:	Aachen University of Technology (RWTH)
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Tomasz Dobek <dobsiens AT o2 DOT pl> wrote:

> Why program, which does print 'hello world', compiles in C compiler only 
> a few seconds, but in C++ a few minutes (!). 

It definitely shouldn't do that if your machine is decently equipped
with RAM by today's standards and the harddisk is properly cached.

C++ compiles are a lot slower than C, yes, and classes with lots of
inlined code add to that time considerably.  But everything beyond 10
seconds for hello.cpp is a sign for serious misconfiguration or a
seriously outdated PC, I'd say.

> I guess that the problem is a compilation of iostream, which is done 
> everytime I compile sth in C++. Can be something done to speed up this 
> process ? Is possible to for example make compilation of iostream once, 
> and then everytime use the compiled output of this library to link with 
> my program ?

It might be possible, but it's very hard to implement.  The makers of
GCC haven't implemented this yet, and we only port what they have to
DOS. 


-- 
Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
Even if all the snow were burnt, ashes would remain.

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