[Bug c++/55081] [4.8 regression?] Non-optimized static array elements initialization

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55081

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |jason at gcc dot gnu.org
   Target Milestone|---                         |4.8.0

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-10-26 14:49:20 UTC ---
Works fine with -std=c++11.
In store_init we have:
  /* In C++0x constant expression is a semantic, not syntactic, property.
     In C++98, make sure that what we thought was a constant expression at
     template definition time is still constant.  */
  if ((cxx_dialect >= cxx0x
       || DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl))
      && (decl_maybe_constant_var_p (decl)
          || TREE_STATIC (decl)))

but here DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) isn't set and
cxx_dialect < cxx0x for -std=c++98.  Not sure what we should do here, either
just call maybe_constant_value or maybe_constant_init otherwise to fold sizeof,
or, if it is really not appropriate for C++98 as an optimization,
fold_sizeof_expr_r recursively plus fold.  Jason, what do you think?