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From: swamp-dog AT ntlworld DOT com (Guy Harrison)
To: <cygwin AT cygwin DOT com>
Subject: Re: BUG - Cygwin to GNU CC compatibility
Date: Mon, 05 Aug 2002 17:30:13 GMT
Message-ID: <3d4eb5c9.344917344@smtp.ntlworld.com>
References: <OE73cChrBb2iDChs0u900007f12 AT hotmail DOT com>
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On Mon, 5 Aug 2002 23:47:03 +1000, "Arash Partow" <arashp AT hotmail DOT com>
wrote:

>Hi all,
>
>I've found a certain combination of simple code that is totally compatible
>with unix/linux GNU compilers and runs perfectly on those OSs however
>even though it compiles fine using Cygwin g++, causes the program to crash
>under windows when executed.

You were unlucky (that it worked at all).

>The demo program is a simple counter example written in C++, no fancy
>code, or special coding tricks have been used. The only libs used are:
>stdio, stdlib and iostream.
>
>The error occurs on a particular malloc, as state before the program runs
>fine on all unix based systems and I was able to compile it with Borland C++
>Builder 6.0 and the produced executable ran fine on windows.

Also unlucky.

>I've tried running the cygwin produced executable on Win95,98,2K,XP,NT
>and on all these OSs the program will crash.
>
>I'm using the latest version of cygwin compiler system as of the 2nd of Aug.
>I have no idea on how to go around fixing a patch for this cause i'm not
>sure
>where to begin, there are a number of places for which such an error like
>this
>can occur, I think it maybe something to do with the Cygwin DLL.
>
>I have uploaded the sourcode, makefile, executable  and a copy of my cygwin
>checkout, the url is:
>http://www.froggy.com.au/arash/cygwin/cygwin_bug.zip
>
>to make the application type:
>make all
>
>to run the application type:
>countertest
>
>If anyone has any suggestions or ideas to fix this BUG can you please e-mail
>me
>ASAP, any other help on how to avoid this bug until someone can come up with
>a patch would be very much appreciated.

std::string dig1("123");	//or std::vector<int> + push_back
std::cout<<"Num digits:"<<dig1.length()<<'\n';

>PS: The malloc in question can be found on line 114 of DigitList.cpp

Most often a symptom of earlier problems. Nothing wrong with the DLL or
gcc here, just language issues. Try alt.comp.lang.learn.c-c++ for an
explanation (for instance) of what is really happening in your copy
constructors.


-- 
swamp-dog AT ntlworld DOT com

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