[Bug c++/42844] const variable requires initializer / no explicitly declared default constructor

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

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42844

--- Comment #15 from Jason Merrill <jason at gcc dot gnu.org> 2011-09-23 21:30:52 UTC ---
Author: jason
Date: Fri Sep 23 21:30:48 2011
New Revision: 179130

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=179130
Log:
    Core 234 - allow const objects with no initializer or
    user-provided default constructor if the defaulted constructor
    initializes all the subobjects.
    PR c++/20039
    PR c++/42844
    * class.c (default_init_uninitialized_part): New.
    * cp-tree.h: Declare it.
    * decl.c (check_for_uninitialized_const_var): Use it.
    * init.c (perform_member_init): Likewise.
    (build_new_1): Likewise.
    * method.c (walk_field_subobs): Likewise.

Added:
    trunk/gcc/testsuite/g++.dg/init/const8.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/class.c
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/decl.c
    trunk/gcc/cp/init.c
    trunk/gcc/cp/method.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/g++.dg/cpp0x/constexpr-object1.C
    trunk/gcc/testsuite/g++.dg/cpp0x/defaulted2.C
    trunk/gcc/testsuite/g++.dg/cpp0x/pr42844-2.C
    trunk/gcc/testsuite/g++.dg/init/pr20039.C
    trunk/gcc/testsuite/g++.dg/init/pr42844.C