Build failure with Geant4 Multithreading on

[JMolson]

$ cat /etc/redhat-release Fedora release 23 (Twenty Three)

$ gcc --version gcc (GCC) 5.1.1 20150618 (Red Hat 5.1.1-4)

Clone into $HOME/bdsim/ then build in $HOME/BDSIM-build

$ cmake ../bdsim/ -- The C compiler identification is GNU 5.1.1 -- The CXX compiler identification is GNU 5.1.1 -- Check for working C compiler: /usr/bin/cc -- Check for working C compiler: /usr/bin/cc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done -- Check for working CXX compiler: /usr/bin/c++ -- Check for working CXX compiler: /usr/bin/c++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done -- Configuring BDSIM 0.8.0 -- Build Type RelWithDebInfo -- Compiler supports C++11 -- Looking for CLHEP... - found -- Found CLHEP 2.3.1.0 in /usr/local/lib/CLHEP-2.3.1.0/../../include -- Looking for ROOT... -- Found ROOT 5.34/32 in /usr -- ROOT support ON -- GDML support ON -- Looking for XML2... - found -- LCDD support ON -- Geant4 Use File: /usr/local/lib64/Geant4-10.1.2/UseGeant4.cmake -- Geant4 Definitions: -DG4_STORE_TRAJECTORY;-DG4VERBOSE;-DG4UI_USE;-DG4VIS_USE;-DG4MULTITHREADED;-DG4UI_USE_TCSH;-DG4INTY_USE_XT;-DG4VIS_USE_RAYTRACERX;-DG4UI_USE_XM;-DG4VIS_USE_OPENGLXM;-DG4VIS_USE_OPENGLX;-DG4VIS_USE_OPENGL -- G4_VERSION: 10.1.2 -- Found Doxygen: /usr/bin/doxygen (found version "1.8.9.1") -- Found BISON: /usr/bin/bison (found version "3.0.4") -- Found FLEX: /usr/bin/flex (found version "2.5.39") -- Found Sphinx: /usr/bin/sphinx-build
-- Configuring done -- Generating done -- Build files have been written to: /home/molson/BDSIM-build

make ->

[ 63%] Building CXX object CMakeFiles/bdsim.dir/src/BDSRunManager.cc.o /home/molson/bdsim/src/BDSRunManager.cc:22:31: error: thread-local declaration of ‘BDSRunManager BDSRunManager::fRunManager’ follows non-thread-local declaration BDSRunManager BDSRunManager::fRunManager = 0; ^ In file included from /home/molson/bdsim/src/BDSRunManager.cc:12:0: /home/molson/bdsim/include/BDSRunManager.hh:26:25: note: ‘BDSRunManager BDSRunManager::fRunManager’ previously declared here static BDSRunManager fRunManager; // needed since singleton inheritance won't work ^ /home/molson/bdsim/src/BDSRunManager.cc:22:31: error: declaration of ‘BDSRunManager BDSRunManager::fRunManager’ outside of class is not definition [-fpermissive] BDSRunManager BDSRunManager::fRunManager = 0;

[Jochem Snuverink]

Thanks for the report. This is most likely since Geant4 was built with multithreading on (GEANT4_BUILD_MULTITHREADED). We currently don't support that, so please build Geant4 with the flag off.

We should put a check on this though, and we'll likely support it in the future.

[JMolson]

Yes, I had it enabled.

Rebuilding with the geant4 multithreading off allowed BDSIM to finish building successfully.

[Jochem Snuverink]

Thanks for the feedback. I will put a check on that flag at configuration with a meaningful error.

In the future we'll likely support multithreading, but that will need some internal reworking.

[Jochem Snuverink]

The latest develop version checks in the configuration step if Geant4 is built with multithreading and fails if so.