CMake: Require c++20

Author: ptheywood

cmake/CheckCompilerFunctionality.cmake

@@ -85,8 +85,8 @@ function(flamegpu_visualiser_check_compiler_functionality)
             CUDA_STD_FILESYSTEM
             "${CMAKE_CURRENT_BINARY_DIR}/try_compile"
             "${CMAKE_CURRENT_LIST_DIR}/CheckCompilerFunctionality/CheckStdFilesystem.cu"
-            CXX_STANDARD 17
-            CUDA_STANDARD 17
+            CXX_STANDARD 20
+            CUDA_STANDARD 20
             CXX_STANDARD_REQUIRED "ON"
         )
     endif()
@@ -122,8 +122,8 @@ function(flamegpu_visualiser_check_compiler_functionality)
                 GCC_CUDA_STDCHRONO
                 "${CMAKE_CURRENT_BINARY_DIR}/try_compile"
                 "${CMAKE_CURRENT_LIST_DIR}/CheckCompilerFunctionality/CheckStdChrono.cu"
-                CXX_STANDARD 17
-                CUDA_STANDARD 17
+                CXX_STANDARD 20
+                CUDA_STANDARD 20
                 CXX_STANDARD_REQUIRED "ON"
             )
         endif()
@@ -164,8 +164,8 @@ function(flamegpu_visualiser_check_compiler_functionality)
                 GCC_CUDA_VECTOR_TUPLE_PUSHBACK
                 "${CMAKE_CURRENT_BINARY_DIR}/try_compile"
                 "${CMAKE_CURRENT_LIST_DIR}/CheckCompilerFunctionality/CheckVectorTuplePushBack.cu"
-                CXX_STANDARD 17
-                CUDA_STANDARD 17
+                CXX_STANDARD 20
+                CUDA_STANDARD 20
                 CXX_STANDARD_REQUIRED "ON"
             )
         endif()

src/CMakeLists.txt

@@ -229,9 +229,9 @@ include(${CMAKE_CURRENT_LIST_DIR}/../cmake/CommonCompilerSettings.cmake)
 # Define output
 add_library("${PROJECT_NAME}" STATIC ${VISUALISER_ALL})
 
-# Require C++17 as a public target property for C++ and CUDA, with no extensions, and the standard is required
-target_compile_features(${PROJECT_NAME} PUBLIC cxx_std_17)
-target_compile_features(${PROJECT_NAME} PUBLIC cuda_std_17)
+# Require C++20 as a public target property for C++ and CUDA, with no extensions, and the standard is required
+target_compile_features(${PROJECT_NAME} PUBLIC cxx_std_20)
+target_compile_features(${PROJECT_NAME} PUBLIC cuda_std_20)
 set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_EXTENSIONS OFF)
 set_property(TARGET ${PROJECT_NAME} PROPERTY CUDA_EXTENSIONS OFF)
 set_property(TARGET ${PROJECT_NAME} PROPERTY CXX_STANDARD_REQUIRED ON)