[Bug c++/51714] [4.6/4.7 Regression] internal compiler error: Segmentation fault with -std=c++11

["jakub at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51714

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-checking
                 CC|                            |jason at gcc dot gnu.org
            Summary|[4.7 Regression] internal   |[4.6/4.7 Regression]
                   |compiler error:             |internal compiler error:
                   |Segmentation fault with     |Segmentation fault with
                   |-std=c++11                  |-std=c++11

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-01-03 08:37:14 UTC ---
Ah, it is a checking-only ICE.  It ICEs during:
20115    #ifdef ENABLE_CHECKING
20116      /* Try to get a constant value for all non-type-dependent
expressions in
20117          order to expose bugs in *_dependent_expression_p and constexpr. 
*/
20118      if (cxx_dialect >= cxx0x)
20119        maybe_constant_value (fold_non_dependent_expr_sfinae (expr,
tf_none));
20120    #endif
which in turn calls tsubst_decl on the verbose variable, while not called from
instantiate_decl of the containing function.
So local_specializations is NULL, retrieve_local_specialization does nothing
and
finally register_local_specialization segfaults, because it expects
local_specializations is non-NULL.