Message-ID: <4DF6B3D4.9050406@cygwin.com>
Date: Mon, 13 Jun 2011 21:05:24 -0400
From: "Larry Hall (Cygwin)" <reply-to-list-only-lh AT cygwin DOT com>
Reply-To: cygwin AT cygwin DOT com
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Subject: Re: G++ 4.3.4 (with Cygwin 1.7) vs.G++ 4.5.2 (with MinGW) ???
References: <BANLkTimb2p-n7gDbu1Ru_PPhBdBPgc96yg AT mail DOT gmail DOT com>
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On 6/13/2011 2:46 AM, Jan Chludzinski wrote:
> Just finished compiling some numerical code (developed using the
> Borland C++ compiler) using G++ 4.3.4 (that came with Cygwin 1.7).
> The answers are different from what I get using the Borland compiler
> (circa 2002).  I have known correct answers from some NASA code and
> compare against those.
>
> I've transitioned of late to Code::Blocks using the latest MinGW.
> MinGW comes with G++ 4.5.2.  I compiled using this compiler and it
> once again it works (I get the same answers as the NASA code).
>
> Are there known problems with G++ 4.3.4?
>
> BTW, the original code was infinite looping until I replaced the old style:
>
> for (i=0; i<WHATEVER; i++) ..
>
> with i declared within the routine (i.e., function) with:
>
> for (int i=0; i<WHATEVER; i++) ...

Try turning off optimizations or at least drop back to -O3.


-- 
Larry

_____________________________________________________________________

A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?

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