Bug in G++?

Bug in G++?

[Kári Davíðsson]

Hi,

I am not shure if this is the right mailing list to ask. If not redirect
me to the correct forum.


Anyway the following minimal c++ program (crash) crashes for me in the
delete line, line 25, if Vectorsize is larger than 3. While the program
"run" seem to run without problems. Is there a known fix for this bug,
except for the obvius to skip the declaration/definition of the default
contructor and destructor?

The backtrace from gdb is:
(gdb) bt
#0  0x400c9b26 in free () from /lib/libc.so.6
#1  0x400c9a0d in free () from /lib/libc.so.6
#2  0x4003e434 in __builtin_delete () from
/usr/lib/libstdc++-libc6.1-2.so.3
#3  0x8048659 in _._7MyClass (this=0x80499e4, __in_chrg=3) at crash.c:17
#4  0x8048714 in main (argc=1, argv=0xbffffce4) at crash.c:25

g++ is
bash-2.03$ g++ --version
2.95.2

Compile with g++ crash.c -o crash -g -DVECTORSIZE=4

Thanks,

K.D.

//Program crash begins
#include <stdio.h>

class MyClass
{
public:
	MyClass();
	~MyClass();
private:
	int i;
};

MyClass::MyClass(void)
{
};

MyClass::~MyClass(void)
{
};

int main(int argc, char** argv)
{
	MyClass * ptr;
	ptr = new MyClass[VECTORSIZE];
	delete ptr;
}

//Program carsh ends

//Program run begins
#include <stdio.h>

class MyClass
{
private:
	int i;
};

int main(int argc, char** argv)
{
	MyClass * ptr;
	ptr = new MyClass[VECTORSIZE];
	delete ptr;
}
//Program run ends

RE: Bug in G++?

[David Korn]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 1295 bytes --]

>-----Original Message-----
>From: Kári Davíðsson [ mailto:kd@flaga.is ]
>Sent: 27 November 2000 12:02
>To: Gcc help maillist (E-mail)
>Subject: Bug in G++? 

>int main(int argc, char** argv)
>{
>	MyClass * ptr;
>	ptr = new MyClass[VECTORSIZE];
>	delete ptr;
>}

  When allocating with operator new[], you MUST use operator delete[] to get
rid of the array of objects. Although one version of your code runs 
successfully, it's just luck.

   hth, 
      DaveK
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