Import RHEL's regression test for #1965951

tests/Regression/bz1965951-Wrong-code-regression-starting-with-gcc-8-5/main.fmf

@@ -0,0 +1,16 @@
+summary: Test for BZ#1965951 (Wrong-code regression starting with gcc 8.5)
+description: |
+    Bug summary: Wrong-code regression starting with gcc 8.5
+    Bugzilla link: https://bugzilla.redhat.com/show_bug.cgi?id=1965951
+contact: Vaclav Kadlcik <vkadlcik@redhat.com>
+component:
+- gcc
+test: ./runtest.sh
+framework: beakerlib
+recommend:
+- gcc-c++
+duration: 15m
+link:
+-   relates: https://bugzilla.redhat.com/show_bug.cgi?id=1965951
+extra-summary: /tools/gcc/Regression/bz1965951-Wrong-code-regression-starting-with-gcc-8-5
+extra-task: /tools/gcc/Regression/bz1965951-Wrong-code-regression-starting-with-gcc-8-5

tests/Regression/bz1965951-Wrong-code-regression-starting-with-gcc-8-5/reproducer.cc

@@ -0,0 +1,12 @@
+#include <iostream>
+struct S1 { virtual ~S1() = default; };
+struct S2 { virtual void f1() = 0; };
+struct S3: S1, S2 {
+    void f1() { f2(); }
+    virtual void f2() = 0;
+};
+struct S4: S3 {
+    void f2() { std::cout << "called\n"; }
+    using S2::f1;
+};
+int main() { S4().f1(); }

tests/Regression/bz1965951-Wrong-code-regression-starting-with-gcc-8-5/runtest.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+# vim: dict+=/usr/share/beakerlib/dictionary.vim cpt=.,w,b,u,t,i,k
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   runtest.sh of /tools/gcc/Regression/bz1965951-Wrong-code-regression-starting-with-gcc-8-5
+#   Description: Test for BZ#1965951 (Wrong-code regression starting with gcc 8.5)
+#   Author: Vaclav Kadlcik <vkadlcik@redhat.com>
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   Copyright (c) 2021 Red Hat, Inc.
+#
+#   This program is free software: you can redistribute it and/or
+#   modify it under the terms of the GNU General Public License as
+#   published by the Free Software Foundation, either version 2 of
+#   the License, or (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be
+#   useful, but WITHOUT ANY WARRANTY; without even the implied
+#   warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+#   PURPOSE.  See the GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program. If not, see http://www.gnu.org/licenses/.
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+# Include Beaker environment
+. /usr/share/beakerlib/beakerlib.sh || exit 1
+
+GCC="${GCC:-$(type -P gcc)}"
+PACKAGE=$(rpm --qf '%{name}\n' -qf $GCC | head -1)
+PACKAGES="${PACKAGE} ${PACKAGE}-c++"
+
+rlJournalStart
+    rlPhaseStartSetup
+        rlLogInfo "PACKAGES=$PACKAGES"
+        rlRun "dnf -y install $PACKAGES" 0-255
+        rlAssertRpm --all
+        rlRun "TmpDir=\$(mktemp -d)"
+        rlRun "cp reproducer.cc $TmpDir"
+        rlRun "pushd $TmpDir"
+    rlPhaseEnd
+
+    rlPhaseStartTest
+        rlRun 'g++ -o reproducer reproducer.cc'
+        rlRun './reproducer'
+    rlPhaseEnd
+
+    rlPhaseStartCleanup
+        rlRun 'popd'
+        rlRun "rm -r $TmpDir"
+    rlPhaseEnd
+rlJournalPrintText
+rlJournalEnd