🚀 go-pugleaf

Hi.  The following program causes g++ 2.2.2 to crash.  

Hierarchy:

        A       B
         \     /
          v   v
           \ /
            C

The crash occurs if either B or C (or both) are virtual base classes of C.
The program compiles fine if non-virtual base classes are used. 


Paul Adams
Department of Computer Sciences
1210 W. Dayton St
Madison, Wisconsin 53706
adams@cs.wisc.edu

--------------------------------------------------------------------------------
Script started on Thu Aug 27 15:28:22 1992
adams 21>cat bug2.c
struct A {
	virtual void f();
}; 

struct B {
	virtual void f() ;
}; 

struct C : virtual A , virtual B {
	virtual void f();
};

void g(A *ptr)
{
	ptr->f();
}
adams 22>g++ -c -v bug2.c
Reading specs from /usr/gnu/lib/gcc-lib/decstation/2.2.2/specs
gcc version 2.2.2
 /usr/gnu/lib/gcc-lib/decstation/2.2.2/cpp -lang-c++ -v -undef -D__GNUC__=2 -D__GNUG__=2 -D__cplusplus -D__ANSI_COMPAT -DMIPSEL -DR3000 -DSYSTYPE_BSD -D_SYSTYPE_BSD -Dbsd4_2 -Dhost_mips -Dmips -Dultrix -Dunix -D__ANSI_COMPAT -D__MIPSEL__ -D__R3000__ -D__SYSTYPE_BSD__ -D___SYSTYPE_BSD__ -D__bsd4_2__ -D__host_mips__ -D__mips__ -D__ultrix__ -D__unix__ -D__ANSI_COMPAT -D__MIPSEL -D__R3000 -D__SYSTYPE_BSD -D___SYSTYPE_BSD -D__bsd4_2 -D__host_mips -D__mips -D__ultrix -D__unix -D__LANGUAGE_C__ -D__LANGUAGE_C -DLA
NGUAGE_C bug2.c /usr/tmp/cca03756.i
GNU CPP version 2.2.2 [AL 1.1, MM 19] DECstation running ultrix
 /usr/gnu/lib/gcc-lib/decstation/2.2.2/cc1plus /usr/tmp/cca03756.i -quiet -dumpbase bug2.cc -version -o /usr/tmp/cca03756.s
GNU C++ version 2.2.2 [AL 1.1, MM 19] DECstation running ultrix compiled by GNU C version 2.2.2.
bug2.c: In function `void  g (struct A*)':
bug2.c:15: cannot convert a pointer of type `A'
bug2.c:15: to a pointer of type `B'
pid 3767 (cc1plus) was killed on an unaligned access, at pc 0x449c4c 
/usr/gnu/bin/gcc: Internal compiler error: program cc1plus got fatal signal 10
adams 23>exit
exit

script done on Thu Aug 27 15:29:03 1992