[Bug other/86153] New: [9 regression] test case g++.dg/pr83239.C fails starting with r261585

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86153

            Bug ID: 86153
           Summary: [9 regression] test case g++.dg/pr83239.C fails
                    starting with r261585
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

make -k check-gcc RUNTESTFLAGS=dg.exp=g++.dg/pr83239.C
. . .
# of expected passes            7
# of unexpected failures        2
FAIL: g++.dg/pr83239.C  -std=gnu++11  scan-tree-dump-not optimized
"_ZNSt6vectorIiSaIiEE17_M_default_appendEm"
FAIL: g++.dg/pr83239.C  -std=gnu++14  scan-tree-dump-not optimized
"_ZNSt6vectorIiSaIiEE17_M_default_appendEm"


The revision changed the trees a bit and those checks now fail.  If this is
working as expected the test cases need to be updated.


r261585 | redi | 2018-06-14 04:26:51 -0500 (Thu, 14 Jun 2018) | 14 lines

PR libstdc++/83982 fix exception-safety guarantee of std::vector::resize

Construct new elements before moving existing ones, so that if a default
constructor throws, the existing elements are not left in a moved-from
state.

2018-06-14  Daniel Trebbien <dtrebbien@gmail.com>
            Jonathan Wakely  <jwakely@redhat.com>

        PR libstdc++/83982
        * include/bits/vector.tcc (vector::_M_default_append(size_type)):
        Default-construct new elements before moving existing ones.
        * testsuite/23_containers/vector/capacity/resize/strong_guarantee.cc:
        New.