[Bug libstdc++/93978] A snippet using views::join fails to compile with -O1, but succeeds with -O0

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93978

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>:

https://gcc.gnu.org/g:a57aa11191617754c8d43b3eb6a2576e970a0668

commit r11-591-ga57aa11191617754c8d43b3eb6a2576e970a0668
Author: Patrick Palka <ppa...@redhat.com>
Date:   Sat May 23 15:25:40 2020 -0400

    libstdc++: Compile PR93978 testcase with -Wall

    Now that the frontend issue PR c++/94038 is thoroughly fixed, the
    testcase for PR93978 no longer fails to compile with -O -Wall, so add
    -Wall to the testcase's compile flags to help ensure we don't regress
    here.

    libstdc++-v3/ChangeLog:

            PR libstdc++/93978
            * testsuite/std/ranges/adaptors/93978.cc: Add -Wall to
            dg-additional-options.  Avoid unused-but-set-variable warning.