[Dune] [#493] test failure: dune-common/common/test/sllisttest

[Dune]

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User who did this - Elias Pipping (pipping) 

Attached to Project - Dune
Summary - test failure: dune-common/common/test/sllisttest
Task Type - Bug Report
Category - Common
Status - Unconfirmed
Assigned To - 
Operating System - Linux 64bit
Severity - Low
Priority - Normal
Reported Version - SVN
Due in Version - Undecided
Due Date - Undecided
Details - sllisttest fails with some optimization.

It works with -O0, -O1, -Os but not -O2 (and -O3).

After a bit of playing around I've found the minimal combination of flags to trigger a test failure:

CXXFLAGS="-O1 -fgcse -fschedule-insns -fstrict-aliasing -ftree-vrp"
make clean;
make -j3 CXXFLAGS="${CXXFLAGS}" && (
  cd common/test/ &&
  rm -f sllisttest &&
  make -j3 CXXFLAGS="${CXXFLAGS}" sllisttest &&
  ./sllisttest
)

Testing ConstIterator 
Testing Iterator 
Testing Iterator 
 Test PushPop
Entry should be 1, but is 0! Push back failed! sllisttest.cc:361
sllisttest: ../../dune/common/sllist.hh:752: void Dune::SLList<T, A>::clear() [with T = int, A = Dune::PoolAllocator<int, 8176ul>]: Assertion `size_==0' failed.

If any of the flags -fgcse -fschedule-insns -fstrict-aliasing -ftree-vrp is dropped, the test succeeds

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=493

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