Date: 07 Feb 2000 16:50:03 -0600
 Original-Message-ID: <fxdbt5smxus.fsf@salsa.cs.wisc.edu>

 I am using this version of g++:

   Reading specs from /s/gcc-2.95.2/sun4x_56/lib/gcc-lib/sparc-sun-solaris2.6/2.95.2/specs 
   gcc version 2.95.2 19991024 (release) 

 and running g++ on this file:

 class eel_private_executable
 {
 public:
   virtual void read_section_descriptors() = 0;
 };

 class executable : public eel_private_executable
 {
 };


 class eel_bfd_executable : public virtual executable
 {
 public:
   virtual void read_section_descriptors();
 };


 class eel_arch_executable : public virtual executable
 {
 };

 class eel_archive_executable : public eel_arch_executable,
				public eel_bfd_executable
 {
 public:
   virtual void read_contents();
 };


 void
 eel_archive_executable::read_contents()
 {
   read_section_descriptors();
 }

 When I run g++ like this:

   g++ -c eel_executable_cpp.C 

 I get this error message:

   eel_executable_cpp.C: In method `void eel_archive_executable::read_contents()': 
   eel_executable_cpp.C:35: request for member `read_section_descriptors' is ambiguous in multiple inheritance lattice 
   eel_executable_cpp.C:5: candidates are: void eel_private_executable::read_section_descriptors() 
   eel_executable_cpp.C:16:                 void eel_bfd_executable::read_section_descriptors() 

 This is a bug because eel_private_executable::read_section_descriptors 
 is abstract, so it can't possibly conflict with
 eel_bfd_executable::read_section_descriptors.

 On my system, uname -a says

   SunOS cabernet 5.6 Generic_105181-17 sun4u sparc

 Thanks.
 --glenn

Release:
2.95.2

How-To-Repeat:
[nathan]
This is a bug, but not because of the abstractness or otherwise
of eel_private_executable::read_section_descriptors.
10.2/6 give examples of this kind of thing, and make it clear
that even though the virtual base is visible via one path,
the fact that it is hidden via another causes this to be
unambiguous.
[nathan]
2000-06-26  Nathan Sidwell  <nathan@codesourcery.com>

        * search.c (hides): Remove.
        (is_subobject_of_p): Add most_derived parameter. Use
        CANONICAL_BINFO.
        (lookup_field_queue_p): Adjust.
        (lookup_field_r): Adjust.