[Bug c++/9688] New: gdb core dump c++ virtual inheritance

["sirlore at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

Gdb core dumps on virtual inheritance, ONLY when base class implementation and
specification is separated. Note that base class specification is in file
`base.h` a implementation is in `base.cpp`.

Release:
GNU gdb 6.8-debian

Environment:
Linux 2.6.26-1-686 #1 SMP Thu Oct 9 15:18:09 UTC 2008 i686 GNU/Linux
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.3.2-1'
--with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--with-system-zlib --libexecdir=/usr/lib --without-included-gettext
--enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.3
--program-suffix=-4.3 --enable-clocale=gnu --enable-libstdcxx-debug
--enable-objc-gc --enable-mpfr --enable-targets=all --enable-cld
--enable-checking=release --build=i486-linux-gnu --host=i486-linux-gnu
--target=i486-linux-gnu
Thread model: posix
gcc version 4.3.2 (Debian 4.3.2-1)



How-To-Repeat:

///FILE base.h

#ifndef __BASE_H__
#define __BASE_H__
class Base {
public:
	Base();
	virtual ~Base();
	virtual void run();
};
#endif

///FILE base.cpp

#include "base.h"
#include <iostream>

Base::Base()
{	 std::cout << "base\n"; }
Base::~Base()
{ }
void Base::run()
{ }

///FILE gdb_bug.cpp

#include "base.h"

class Derived1 : virtual public Base{	
protected:
	int i;					
public:	
	Derived1(){};		
};

class Derived2 : public Derived1 {
public:
	Derived2(){};
	~Derived2(){};
};

class Derived3 : virtual public Base {
public:
	Derived3(){};
	~Derived3(){};
};

class Bug : public Derived2, public Derived3{
public:		
	Bug(){};
	~Bug(){};				
	virtual void run(){};
};

int main(int argc, char *argv[])
{
	Bug b;	
	int a =2; // breakpoint here. Command `print b` makes gdb SEG FAULT
			
	return 0;
}

//-------------------------------
g++ -O0 -g3 base.cpp gdb_bug.cpp -o bug 
gdb ./bug
break main
run
n
print b
************* SEGMENTAION FAULT ************

-- 
           Summary: gdb core dump c++ virtual inheritance
           Product: gdb
           Version: 6.8
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: c++
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: sirlore at gmail dot com
                CC: gdb-prs at sourceware dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=9688

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