Recent Kokkos changes require -std=c++11 flag with CUDA 8.0 & GCC 5.3

Created by: mhoemmen

@trilinos/framework

It looks like C++11 is not being enabled by default in a CUDA 8.0 + GCC 5.3 build with TpetraCore enabled. When I omit -std=c++11 from CMAKE_CXX_FLAGS in a CUDA 8.0 + GCC 5.3 build with TpetraCore enabled, I get the following configure-time error:

-- MPI_EXEC='/projects/sems/install/rhel6-x86_64/kokkos/compiler/gcc/5.3.0/openmpi/2.0.1/cuda/8.0.44/bin/mpiexec'
-- The C compiler identification is GNU 5.3.0
-- Check for working C compiler: /projects/sems/install/rhel6-x86_64/kokkos/compiler/gcc/5.3.0/openmpi/2.0.1/cuda/8.0.44/bin/mpicc
-- Check for working C compiler: /projects/sems/install/rhel6-x86_64/kokkos/compiler/gcc/5.3.0/openmpi/2.0.1/cuda/8.0.44/bin/mpicc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- CMAKE_C_COMPILER_ID='GNU'
-- CMAKE_C_COMPILER_VERSION='5.3.0'
-- The CXX compiler identification is unknown
-- Check for working CXX compiler: /projects/sems/install/rhel6-x86_64/kokkos/compiler/gcc/5.3.0/openmpi/2.0.1/cuda/8.0.44/bin/mpicxx
-- Check for working CXX compiler: /projects/sems/install/rhel6-x86_64/kokkos/compiler/gcc/5.3.0/openmpi/2.0.1/cuda/8.0.44/bin/mpicxx -- broken
CMake Error at /projects/sems/install/rhel6-x86_64/sems/utility/cmake/3.3.2/share/cmake-3.3/Modules/CMakeTestCXXCompiler.cmake:54 (message):
  The C++ compiler
  "/projects/sems/install/rhel6-x86_64/kokkos/compiler/gcc/5.3.0/openmpi/2.0.1/cuda/8.0.44/bin/mpicxx"
  is not able to compile a simple test program.

  It fails with the following output:

   Change Dir: .../Trilinos/CHECKIN-CUDA-8.0/MPI_DEBUG_REAL/CMakeFiles/CMakeTmp

  Run Build Command:"/usr/bin/gmake" "cmTC_64169/fast"

  /usr/bin/gmake -f CMakeFiles/cmTC_64169.dir/build.make
  CMakeFiles/cmTC_64169.dir/build

  gmake[1]: Entering directory
  `.../Trilinos/CHECKIN-CUDA-8.0/MPI_DEBUG_REAL/CMakeFiles/CMakeTmp'

  Building CXX object CMakeFiles/cmTC_64169.dir/testCXXCompiler.cxx.o
/projects/sems/install/rhel6-x86_64/kokkos/compiler/gcc/5.3.0/openmpi/2.0.1/cuda/8.0.44/bin/mpicxx
  -Wall -expt-extended-lambda -o
  CMakeFiles/cmTC_64169.dir/testCXXCompiler.cxx.o -c
  .../Trilinos/CHECKIN-CUDA-8.0/MPI_DEBUG_REAL/CMakeFiles/CMakeTmp/testCXXCompiler.cxx

  /projects/sems/install/rhel6-x86_64/kokkos/compiler/cuda/8.0.44/bin/..//include/cuda_runtime.h:140:1:
  warning: identifier ‘static_assert’ is a keyword in C++11
  [-Wc++0x-compat]

  /projects/sems/install/rhel6-x86_64/kokkos/compiler/cuda/8.0.44/bin/..//include/cuda_runtime.h:156:1:
  warning: identifier ‘decltype’ is a keyword in C++11 [-Wc++0x-compat]

    *
   ^

  /projects/sems/install/rhel6-x86_64/kokkos/compiler/cuda/8.0.44/bin/..//include/cuda_runtime.h:133:29:
  error: template argument 1 is invalid

   #if defined(__cplusplus) && !defined(__CUDACC_RTC__)
                               ^

  /projects/sems/install/rhel6-x86_64/kokkos/compiler/cuda/8.0.44/bin/..//include/cuda_runtime.h:138:32:
  warning: variadic templates only available with -std=c++11 or -std=gnu++11

   *                                                                              *
                                  ^

  /projects/sems/install/rhel6-x86_64/kokkos/compiler/cuda/8.0.44/bin/..//include/cuda_runtime.h:140:15:
  error: expected identifier before ‘sizeof’
/projects/sems/install/rhel6-x86_64/kokkos/compiler/cuda/8.0.44/bin/..//include/cuda_runtime.h:140:15:
  error: expected ‘,’ or ‘...’ before ‘sizeof’

  /projects/sems/install/rhel6-x86_64/kokkos/compiler/cuda/8.0.44/bin/..//include/cuda_runtime.h:140:104:
  error: ISO C++ forbids declaration of ‘static_assert’ with no type
  [-fpermissive]

  /projects/sems/install/rhel6-x86_64/kokkos/compiler/cuda/8.0.44/bin/..//include/cuda_runtime.h:145:19:
  warning: variadic templates only available with -std=c++11 or -std=gnu++11

  /projects/sems/install/rhel6-x86_64/kokkos/compiler/cuda/8.0.44/bin/..//include/cuda_runtime.h:146:18:
  warning: variadic templates only available with -std=c++11 or -std=gnu++11

  /projects/sems/install/rhel6-x86_64/kokkos/compiler/cuda/8.0.44/bin/..//include/cuda_runtime.h:148:49:
  warning: variadic templates only available with -std=c++11 or -std=gnu++11
....

When I add -std=c++11 to CMAKE_CXX_FLAGS, I am able to configure Trilinos and build TpetraCore library, tests, and examples.