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From:	"Boris Schaeling" <boriss AT web DOT de>
To:	<cygwin AT cygwin DOT com>
Subject:	Bug in g++: Testcase exits with segmentation fault
Date:	Mon, 13 Jan 2003 16:13:32 +0100
Message-ID:	<LOBBKDBPKEGJJFKNFHKBOELHIFAA.boriss@web.de>
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The testcase attached to this mail compiled with g++ 2.95.3-10 or g++ 3.2
20020927 under Cygwin 1.3.18 exits with segmentation fault. It seems to be
an error in g++ as the testcase doesn't work under Linux either. Can anyone
help or do I have to report this error to the GCC website?

BTW I found two ways to make the testcase work:
1) Change line 64 (and 70 respectively) and use "observer *Observer" instead
of "std::list<observer>". I compiled the testcase with STLport-4.5.3 under
Linux to see if it's a bug in the Standard Library but got again
segmentation fault.
2) Remove line 75 which is a simple "poll(NULL, 0, 2000)". It works without
this line but I don't know why.

Boris

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/*=20
 * Testcase causing segmentation fault under Cygwin and Linux=20
 * Boris Schaeling (boriss AT web DOT de)=20
 *=20
 * Compile:   g++ -otestcase testcase.cpp=20
 * Run:       ./testcase=20
 */=20

#include <iostream>=20
#include <list>=20

extern "C" {=20
#include <poll.h>=20
}=20

/* ********** observer_base & observer ********** */=20

class observer_base=20
{=20
public:=20
	virtual void run(void) { }=20
};=20

class observer : public observer_base=20
{=20
public:=20
	observer();=20
	void run(void) { std::cout << "Hello" << std::endl; }=20
};=20

/* ********** adapter_base & adapter ********** */=20

class adapter_base=20
{=20
protected:=20
	observer_base *Observer;=20
public:=20
	virtual void set_observer(observer_base *O) { Observer =3D O; }=20
	virtual void run(void) { }=20
};=20

class adapter : public adapter_base=20
{=20
public:=20
	void run(void) { Observer->run(); }    /* <--- SEGMENTATION FAULT?! */=20
};=20

/* ********** select_data & select ********** */=20

class select_data=20
{=20
public:=20
	adapter_base *Adapter;=20
	select_data() { }=20
	select_data(adapter_base *A) : Adapter(A) { }=20
	void run(void) { Adapter->run(); }=20
};=20

class select=20
{=20
private:=20
	adapter Adapter;=20
	select_data Data[1];=20
	std::list<observer> Observers;    /* <--- CHANGE THIS TO: observer =
*Observer; */=20
public:=20
	select()=20
	{=20
		select_data data(&Adapter);=20
		Data[0] =3D data;=20
		Observers.push_back(observer());    /* <--- AND CHANGE THIS TO: =
Observer =3D new observer; AND EVERYTHING WORKS */=20
	}=20
	void give(observer_base *O) { Data[0].Adapter->set_observer(O); }=20
	void run(void)=20
	{=20
		poll(NULL, 0, 2000);   /* <--- OR REMOVE THIS LINE AND EVERYTHING =
WORKS */=20
		Data[0].run();=20
	}=20
};=20

/* ********** something else ********** */=20

class select Select;=20

observer::observer() { Select.give(this); }=20

/* ********** main ********** */=20

int main()=20
{=20
	Select.run();=20
}=20


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