Switch cuda target architecture from sm_30 to sm_50. I.e. Maxwell instead of Kepler.

dlib/CMakeLists.txt

@@ -645,7 +645,7 @@ if (NOT TARGET dlib)
             # Note that we add __STRICT_ANSI__ to avoid freaking out nvcc with gcc specific
             # magic in the standard C++ header files (since nvcc uses gcc headers on
             # linux).
-            list(APPEND CUDA_NVCC_FLAGS "-arch=sm_30;-D__STRICT_ANSI__;-D_MWAITXINTRIN_H_INCLUDED;-D_FORCE_INLINES;${FLAGS_FOR_NVCC}")
+            list(APPEND CUDA_NVCC_FLAGS "-arch=sm_50;-D__STRICT_ANSI__;-D_MWAITXINTRIN_H_INCLUDED;-D_FORCE_INLINES;${FLAGS_FOR_NVCC}")
             list(APPEND CUDA_NVCC_FLAGS ${active_preprocessor_switches})
             if (NOT DLIB_IN_PROJECT_BUILD)
                LIST(APPEND CUDA_NVCC_FLAGS -DDLIB__CMAKE_GENERATED_A_CONFIG_H_FILE)

dlib/cmake_utils/test_for_cuda/CMakeLists.txt

@@ -9,6 +9,6 @@ add_definitions(-DDLIB_USE_CUDA)
 option(CUDA_PROPAGATE_HOST_FLAGS "Propage C/CXX_FLAGS and friends to the host compiler via -Xcompile" OFF)
 find_package(CUDA 7.5 REQUIRED)
 set(CUDA_HOST_COMPILATION_CPP ON)
-list(APPEND CUDA_NVCC_FLAGS "-arch=sm_30;-std=c++11;-D__STRICT_ANSI__;-D_MWAITXINTRIN_H_INCLUDED;-D_FORCE_INLINES")
+list(APPEND CUDA_NVCC_FLAGS "-arch=sm_50;-std=c++11;-D__STRICT_ANSI__;-D_MWAITXINTRIN_H_INCLUDED;-D_FORCE_INLINES")
 
 cuda_add_library(cuda_test STATIC cuda_test.cu )

dlib/cmake_utils/test_for_cudnn/CMakeLists.txt

@@ -7,7 +7,7 @@ include(../use_cpp_11.cmake)
 option(CUDA_PROPAGATE_HOST_FLAGS "Propage C/CXX_FLAGS and friends to the host compiler via -Xcompile" OFF)
 find_package(CUDA 7.5 REQUIRED)
 set(CUDA_HOST_COMPILATION_CPP ON)
-list(APPEND CUDA_NVCC_FLAGS "-arch=sm_30;-std=c++11;-D__STRICT_ANSI__")
+list(APPEND CUDA_NVCC_FLAGS "-arch=sm_50;-std=c++11;-D__STRICT_ANSI__")
 add_definitions(-DDLIB_USE_CUDA)
 
 include(find_cudnn.txt)