Re: as: error 7403: undefined label - _ZTVN10__cxxabiv120__si_class_type_infoE [was Re: fix execute/20010518-2.c]

["John David Anglin" <dave at hiauly1 dot hia dot nrc dot ca>]

> > A work around is to include <cxxabi.h>.  If this is the correct solution,
> > then a lot of code needs fixing.

I have done a little more investigation.  This is the problematic code
from import_export_vtable:

      /* We can only wait to decide if we have real non-inline virtual
	 functions in our class, or if we come from a template.  */

	 int found = (CLASSTYPE_TEMPLATE_INSTANTIATION (type)
		      || key_method (type));

	 if (final || ! found)
	   {
	     comdat_linkage (decl);
	     DECL_EXTERNAL (decl) = 0;
	   }
         else
           {
             TREE_PUBLIC (decl) = 1;
             DECL_EXTERNAL (decl) = 1;
	   }

When cxxabi.h is included, there is always a method for the standard abi
type info types (found is true).  The causes TREE_PUBLIC and DECL_EXTERNAL
to be set and a .IMPORT statement is generated.  When the header is not
included, there are no methods and we get comdat linkage.

The two fixes that I see are:

  1)  Build the standard methods equivalent to those in cxxabi.h internally
      in cc1plus (your not supposed to have to include cxxabi.h), or
  2)  Check to see if `type' is one of the standard typeinfo types and set
      TREE_PUBLIC and DECL_EXTERNAL accordingly.

Thoughts?

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)