This popped up in our buildslave, on a 64-bit Fedora 21 server configured to use
optimized build and also using CPPFLAGS='-std=c++11'.


 [2105/2468] Compiling src/lte/model/eps-bearer-tag.cc
In file included from ./ns3/epc-x2-header.h:24:0,
                 from ../src/lte/model/epc-x2.cc:27:
./ns3/epc-x2-sap.h: In member function ‘void ns3::EpcX2::RecvFromX2cSocket(ns3::Ptr<ns3::Socket>)’:
./ns3/epc-x2-sap.h:311:10: error: ‘params.ns3::EpcX2Sap::ResourceStatusUpdateParams::targetCellId’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
   struct ResourceStatusUpdateParams
          ^
../src/lte/model/epc-x2.cc:350:52: note: ‘params.ns3::EpcX2Sap::ResourceStatusUpdateParams::targetCellId’ was declared here
           EpcX2SapUser::ResourceStatusUpdateParams params;
                                                    ^
cc1plus: all warnings being treated as errors

Details here:
https://ns-buildmaster.ee.washington.edu:8010/job/daily-linux-c++-11/label=Fedora-64-21/485/console