[Bug debug/49348] DW_TAG_template_* DIEs missing from template specializations

[dodji at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49348

--- Comment #1 from Dodji Seketeli <dodji at gcc dot gnu.org> 2011-06-09 21:46:17 UTC ---
Created attachment 24479
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24479
Candidate patch

For a given template instantiation, the dwarf backends emits debug
info that describes its template parameters and arguments if
generic_type_p returns TRUE on the the instantiation.  For that,
primary_template_instantiation_p must be also return TRUE.

The problem in this PR is that primary_template_instantiation_p
doesn't return TRUE for explicit specializations.  This patch makes it
return true for explicit specializations and instantiations of a
primary template.

Stricto sensu I think I should rename the function
primary_template_instantiation_p into
primary_template_specialization_p, as [temp.spec]/4 reads

    A specialization is a class, function, or class member that is
    either instantiated or explicitly specialized