now works with cmake v3.20

Author: alphaville

CMakeLists.txt

@@ -2,43 +2,42 @@
 # GPUtils
 # ====================================================================
 cmake_minimum_required(VERSION 3.20 FATAL_ERROR)
-cmake_policy(SET CMP0135 NEW)
+
+if(CMAKE_VERSION VERSION_GREATER_EQUAL "3.29")
+    cmake_policy(SET CMP0135 NEW)
+endif()
+
+# Set C++ version and SM architecture
+if (NOT DEFINED CPPVERSION)
+    set(CPPVERSION 20) # A40: 20, Orin: 17
+endif()
+if (NOT DEFINED SM_ARCH)
+    set(SM_ARCH 86)# A40: 86, Orin: 87
+endif()
+
+
 project(GPUtils
         DESCRIPTION "Easy use of vectors and matrices on GPGPU devices."
         HOMEPAGE_URL "https://github.com/GPUEngineering/GPUtils"
         LANGUAGES CXX
         )
-
-
-option(CPPVERSION "C++ version" 20) # A40: 20, Orin: 17
-option(SM_ARCH "SM architecture" 86) # A40: 86, Orin: 87
-
-set (cppversion ${CPPVERSION})
-set (cppstd "c++${CPPVERSION}")
-set (cxxstd cxx_std_${CPPVERSION})
-
 # ----
-
 set(CMAKE_CUDA_SEPARABLE_COMPILATION ON)  # required for calling cuda kernels from cuda kernels
-set(CMAKE_CUDA_COMPILER "/usr/local/cuda-11.4/bin/nvcc")
+set(CMAKE_CUDA_COMPILER "/usr/local/cuda/bin/nvcc")
 set(CMAKE_CUDA_ARCHITECTURES ${SM_ARCH})
-set(CMAKE_CUDA_STANDARD ${cppversion})
-set(CMAKE_CXX_STANDARD ${cppversion})
-set(CMAKE_CUDA_FLAGS "-std=${cppstd}")
-set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS}; -std=${cppstd})
+set(CMAKE_CUDA_STANDARD ${CPPVERSION})
+set(CMAKE_CXX_STANDARD ${CPPVERSION})
+set(CMAKE_CUDA_FLAGS "-std=c++${CPPVERSION}")
+set(CUDA_NVCC_FLAGS ${CUDA_NVCC_FLAGS}; "-std=c++${CPPVERSION}")
 enable_language(CUDA)
-
 # ----
-
 add_library(device_compiler_flags INTERFACE)
-target_compile_features(device_compiler_flags INTERFACE ${cxxstd})
+target_compile_features(device_compiler_flags INTERFACE cxx_std_${CPPVERSION})
 set(CMAKE_CXX_EXTENSIONS OFF)
-
 # ----
-
 add_library(developer_flags INTERFACE)
 set(cxx_flags -Wall)
-set(cuda_flags -arch=sm_${SM_ARCH} -std=${cppstd} -Xcompiler=-Wall -Xcudafe=--display_error_number -g)
+set(cuda_flags -arch=sm_${SM_ARCH} -std=c++${CPPVERSION} -Xcompiler=-Wall -Xcudafe=--display_error_number -g)
 target_compile_options(developer_flags
         INTERFACE
         # flags for CXX builds
@@ -47,7 +46,6 @@ target_compile_options(developer_flags
         $<$<COMPILE_LANGUAGE:CUDA>:${cuda_flags}>
         )
 target_link_libraries(device_compiler_flags INTERFACE $<BUILD_INTERFACE:developer_flags>)
-
 # ----