Re: c++/2935: internal compiler error gcc

Re: c++/2935: internal compiler error gcc

[rodrigc]

Synopsis: internal compiler error gcc

State-Changed-From-To: feedback->closed
State-Changed-By: rodrigc
State-Changed-When: Tue Jun 12 21:13:11 2001
State-Changed-Why:
    Reproducible test-case not supplied.
    Preprocessed source code not supplied.
    
    The following example from the report does not
    compile under gcc 3.0:
    
    #include <iostream>
    using namespace std;
     
    class debug {
      debug (char *name)
      {
      };
      dbgout (char *str)
      {
        cout << "[" << name << "]: " << str;
      }
    };
    class a:public debug { };
    class b:public debug { };
     
    class c:public a, public b {
      void foo () {
        dbgout ("foo fighter");
      }
    };
    
    a.cc: In member function `void c::foo()':
    a.cc:26: request for member `dbgout' is ambiguous in multiple inheritance
       lattice
    a.cc:10: candidates are: int debug::dbgout(char*)
    a.cc:10:                 int debug::dbgout(char*)

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view&pr=2935&database=gcc

c++/2935: internal compiler error gcc

[deepblur]

>Number:         2935
>Category:       c++
>Synopsis:       internal compiler error gcc
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 25 01:16:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     gcc
>Release:        unknown-1.0
>Organization:
>Environment:
Reading specs from /usr/local/lib/gcc-lib/i686-pc-linux-gnu/2.95.3/specs
gcc version 2.95.3 20010315 (release)
on a RH7.0 system using kernel 2.4.4 (which doesnt matter, i suppose)
>Description:
say i have a debug class, every other class in my project implements it to
get sensible debugging. this class has a method dbgout(char *str) 
which prints debuggee infos, for corresponding classes.
class debug {
  debug(char *name) { ... };
  dbgout(char *str) { cout << "["<< name << "]: "<<str; }
};
class a : public debug 
{ ... };
class b : public debug
{ ... };

here the "internal compiler error" appears:

class c : public a, public b {

void foo() { dbgout("foo fighter"); }

}

this produces the error. because gcc cant decide, which dbgout() to use.
by replacing foo with

void foo() { a::dbgout("foobidoo"); }

it works.
aint the compiler smart enough to say something like: could not decide which symbol to use??

i hope the description is good enough for those sorts of things 
>How-To-Repeat:
see above
>Fix:
see above
>Release-Note:
>Audit-Trail:
>Unformatted: