[Bug c++/87594] constexpr rejects-valid code with range-based for-loop

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87594

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Oct 29 19:40:18 2018
New Revision: 265600

URL: https://gcc.gnu.org/viewcvs?rev=265600&root=gcc&view=rev
Log:
        PR c++/87594 - constexpr rejects-valid with range-based for.
        * constexpr.c (potential_constant_expression_1): If the condition
        can't be evaluated, return true.

        * g++.dg/cpp1y/constexpr-loop8.C: New test.

Added:
    trunk/gcc/testsuite/g++.dg/cpp1y/constexpr-loop8.C
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/constexpr.c
    trunk/gcc/testsuite/ChangeLog