[Bug c++/84906] [8 Regression] Ambiguous conversion not diagnosed, causes entire selection-statement to be omitted

[jason at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84906

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> ---
Author: jason
Date: Fri Mar 16 18:55:54 2018
New Revision: 258603

URL: https://gcc.gnu.org/viewcvs?rev=258603&root=gcc&view=rev
Log:
        PR c++/84906 - silent wrong code with ambiguous conversion.

        * call.c (build_user_type_conversion_1): Set need_temporary_p on
        ambiguous conversion.
        (convert_like_real): Check it.

Added:
    trunk/gcc/testsuite/g++.dg/cpp1y/auto-fn50.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/call.c