Bump C++ standards to 14; avoids several cuda warnings

CMakeLists.txt

@@ -7,7 +7,7 @@ enable_testing()
 set (psrdada_cpp_VERSION_MAJOR 0)
 set (psrdada_cpp_VERSION_MINOR 1)
 
-set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD 14)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 # cmake setup.

cmake/cuda.cmake

@@ -15,7 +15,7 @@ if(ENABLE_CUDA)
   add_definitions(-DENABLE_CUDA)
 
   # Pass options to NVCC ( -ccbin /path  --compiler-options -lfftw3f --compiler-options -lm --verbose)
-  list(APPEND CUDA_NVCC_FLAGS -DENABLE_CUDA --std c++11 -Wno-deprecated-gpu-targets --ptxas-options=-v)
+  list(APPEND CUDA_NVCC_FLAGS -DENABLE_CUDA --std c++${CMAKE_CXX_STANDARD} -Wno-deprecated-gpu-targets --ptxas-options=-v)
   list(APPEND CUDA_NVCC_FLAGS_DEBUG --debug; --device-debug; --generate-line-info -Xcompiler "-Wextra" -Xcompiler "-Werror")
   list(APPEND CUDA_NVCC_FLAGS_PROFILE --generate-line-info)
   #list(APPEND CUDA_NVCC_FLAGS -arch compute_35) # minumum compute level (Sps restriction)