[Qt-interest] win32-g++ compiled Qt app much bigger than win32-msvc compiled one?

[Malyushytsky, Alex]

Francisco,

As far as I know QT does not support anything, but gcc 3.4.2 on Windows yet.
So even it might have better optimizations you have no way to use it.

About performance. I would call an Intel compiler a king of performance on Windows. Even though I have negative experience with Intel support and reliability these days, we use Intel compiler in our office.
Due to the nature of our product we need the best performance possible and found that intel compiler provides the best one.

If you want to compile QT with it, you might have a problem. Qt 4.5 I believe has issues with using Intel CC 10.
But we don't have problems linking code compiled with Intel and msvc compilers together, so there is a work around, if you can split your QT based gui and modules you need to be compiled with Intel compiler.

So my answer was related to usage gcc 3.4.2 over msvc, which is correct according to my experience.

If you have better answer, you are welcome to correct me.
But please respond to the mailing list. This may give others, not only me  an opportunity to participate or learn from discussion.

Alex


-----Original Message-----
From: Francisco Ares [mailto:frares at gmail.com]
Sent: Sunday, March 29, 2009 10:57 PM
To: Malyushytsky, Alex
Subject: Re: [Qt-interest] win32-g++ compiled Qt app much bigger than win32-msvc compiled one?

2009/3/28 Malyushytsky, Alex <alex at wai.com>:
> I would say no matter what you do msvc compiler has the better optimization.
>
> I am not sure, if you can improve anything in your case,
>
> but in general you should get smaller files and/or faster application using
> either msvc compiler on Windows.
>
>
>
> Alex
>
>
>

AFAIK that's the opposite, gcc has better optimizations, specially
gcc4 - recent versions, of course, that are able to use the specific
instructions from Intel's dual core processors - also considering you
are able to use the mingw port.

... and there is always UPX

http://upx.sourceforge.net/


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"If you have an apple and I have an apple and we exchange apples then
you and I will still each have one apple. But if you have an idea and
I have one idea and we exchange these ideas, then each of us will have
two ideas." - George Bernard Shaw


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