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Date:	Wed, 25 Aug 2004 19:16:45 +0200
From:	"Gerrit P. Haase" <freeweb AT nyckelpiga DOT de>
Reply-To:	"Gerrit P. Haase" <freeweb AT nyckelpiga DOT de>
Organization:	Esse keine toten Tiere
Message-ID:	<11845274424.20040825191645@familiehaase.de>
To:	Luke Stras <stras AT utias DOT utoronto DOT ca>
CC:	cygwin AT cygwin DOT com
Subject:	Re: Trouble with std::vector in g++
In-Reply-To:	<20040825164918.GF9503@arrow.utias.utoronto.ca>
References:	<20040825164918 DOT GF9503 AT arrow DOT utias DOT utoronto DOT ca>
MIME-Version:	1.0

Luke wrote:

> I am having some trouble with the std::vector class in g++ 3.3.3.  If I
> compile the following program and run it, it segfaults in the call to
> push_back; reducing the array in Solution to 512*1024 makes the code run
> OK.

> If I compile it with g++ 3.2.1 under Linux, the program runs fine.

> Is it just my misunderstanding of how the STL works, or is there a
> compiler/library problm here?

> vvv begin code vvv

> #include <vector>

> class Solution {
> public:
>   char se[1024*1024];
> };

> class Element {
> public:
>   Solution s;
> };

> typedef std::vector<Element> element_list_t;

> class Mesh {
> public:
>   element_list_t elements;
> };

> int
> main()
> {
>   Mesh *mesh = new Mesh;

>   Element el;

>   mesh->elements.push_back(el);

>   return 0;
> }

> ^^^ end code sample ^^^

> compile with:

> $ g++ -Wall -o etest etest.cc
> $ ./etest
> Segmentation fault (core dumped)

Increase the stack:
g++ -Wall -Wl,--stack=8000000 -o etest etest.cc

This works for me with gcc-3.4.1(tm).  The default stack for Cygwin
executables is 2MB which seems to be too small for your program.

Gerrit
-- 
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