Link to v5: https://sourceware.org/ml/gdb-patches/2014-11/msg00394.html

I have made all the changes suggested by Ulrich Weigand in his comments for v5.

gdb/ChangeLog:

2014-11-27  Siva Chandra Reddy  <sivachandra@google.com>

        * eval.c: Include gdbthread.h.
        (evaluate_subexp): Enable thread stack temporaries before
        evaluating a complete expression and clean them up after the
        evaluation is complete.
        * gdbthread.h: Include common/vec.h.
        (value_ptr): New typedef.
        (VEC (value_ptr)): New vector type.
        (value_vec): New typedef.
        (struct thread_info): Add new fields stack_temporaries_enabled
        and stack_temporaries.
        (enable_thread_stack_temporaries)
        (thread_stack_temporaries_enabled_p, push_thread_stack_temporary)
        (get_last_thread_stack_temporary)
        (value_in_thread_stack_temporaries): Declare.
        * gdbtypes.c (class_or_union_p): New function.
        * gdbtypes.h (class_or_union_p): Declare.
        * infcall.c (call_function_by_hand): Store return values of class
        type as temporaries on stack.
        * thread.c (enable_thread_stack_temporaries): New function.
        (thread_stack_temporaries_enabled_p, push_thread_stack_temporary)
        (get_last_thread_stack_temporary): Likewise.
        (value_in_thread_stack_temporaries): Likewise.
        * value.c (value_force_lval): New function.
        * value.h (value_force_lval): Declare.

gdb/testsuite/ChangeLog:

2014-11-27  Siva Chandra Reddy  <sivachandra@google.com>

        * gdb.cp/chained-calls.cc: New file.
        * gdb.cp/chained-calls.exp: New file.
        * gdb.cp/smartp.exp: Remove KFAIL for "p c2->inta".