[Bug c++/77337] [7 regression][c++1z] use before deduction of 'auto'

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77337

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Thu Nov 10 21:42:36 2016
New Revision: 242056

URL: https://gcc.gnu.org/viewcvs?rev=242056&root=gcc&view=rev
Log:
        PR c++/77337 - auto return and lambda

        * pt.c (tsubst_friend_function): Don't set DECL_INITIAL.
        (instantiate_decl): It's OK to defer a constexpr function.
        * cp-tree.h (DECL_FRIEND_PSEUDO_TEMPLATE_INSTANTIATION): Check
        DECL_LANG_SPECIFIC.
        * decl2.c (decl_defined_p): Use it.  No longer static.
        * decl.c (redeclaration_error_message): Use decl_defined_p.
        * constexpr.c (cxx_eval_call_expression): Set input_location around
        call to instantiate_decl.

Added:
    trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn33.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/constexpr.c
    trunk/gcc/cp/cp-tree.h
    trunk/gcc/cp/decl.c
    trunk/gcc/cp/decl2.c
    trunk/gcc/cp/pt.c