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Date: Tue, 22 May 2007 04:00:00 -0000
Subject: [Bug c++/32029]  New: Internal Compiler Error on instantiation of template parameter
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From: "ejt at andrew dot cmu dot edu" <gcc-bugzilla@gcc.gnu.org>
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When there is a default template parameter based on a templated class member
type, the compiler dies a nasty death.  As far as I can tell, gcc prior to 4.1
branch works fine, but all of the 4.1 branch seems to have this problem.

Quick summary... This works:
  template<class T, Al=typename Factory0Arg<T>::template Factory<T> > class
thing {/*...*/};

This ICEs:
  template<class T, Al=class Factory0Arg<T>::Factory<T> > class thing
{/*...*/};
whenever you try to instantiate 'thing', as seen below:
$ g++ -Wall bug.cc -o bug
bug.cc: In instantiation of ‘Factory0Arg<foo>::Factory<foo>’:
bug.cc:41:   instantiated from ‘void thing<T, Al>::makeIt() [with T = foo, Al =
Factory0Arg<foo>::Factory<foo>]’
bug.cc:53:   instantiated from here
bug.cc:19: internal compiler error: in instantiate_class_template, at
cp/pt.c:5666

I would at least hope for a better error message assuming that's not valid
syntax ;)

I'll attach original and preprocessed source.


-- 
           Summary: Internal Compiler Error on instantiation of template
                    parameter
           Product: gcc
           Version: 4.1.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: ejt at andrew dot cmu dot edu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32029