[Bug c++/80598] [7 regression] -Wunused triggers for functions used in uninstantiated templates

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80598

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Fri Jun 22 20:32:15 2018
New Revision: 261915

URL: https://gcc.gnu.org/viewcvs?rev=261915&root=gcc&view=rev
Log:
        Backported from mainline
        2018-03-08  Jason Merrill  <jason@redhat.com>
                    Jakub Jelinek  <jakub@redhat.com>

        PR c++/80598
        * call.c (build_over_call): In templates set TREE_USED (first_fn) when
        not calling mark_used for the benefit of -Wunused-function warning.

        * g++.dg/warn/Wunused-function4.C: New test.

Added:
    branches/gcc-7-branch/gcc/testsuite/g++.dg/warn/Wunused-function4.C
Modified:
    branches/gcc-7-branch/gcc/cp/ChangeLog
    branches/gcc-7-branch/gcc/cp/call.c
    branches/gcc-7-branch/gcc/testsuite/ChangeLog