build: set default cpp standard to 20

gocarlos · gocarlos · commit 6d709f06b999 · 2020-05-17T05:35:01.000-07:00
diff --git a/CMakeLists.txt b/CMakeLists.txt
@@ -59,15 +59,9 @@ if(MSVC)
   message(STATUS "using msvc")
   add_definitions(-D_WIN32_WINNT=0x600)
   add_definitions(-DBOOST_UUID_RANDOM_PROVIDER_FORCE_WINCRYPT)
-  if(MSVC_VERSION GREATER_EQUAL "1900")
-    include(CheckCXXCompilerFlag)
-    check_cxx_compiler_flag("/std:c++latest"
-                            _cpp_latest_flag_supported)
-    if(_cpp_latest_flag_supported)
-      add_compile_options("/std:c++latest")
-    endif()
-  endif()
-else()
+endif()
+
+if(NOT CMAKE_CXX_STANDARD)
   set(CMAKE_CXX_STANDARD 17)
   set(CMAKE_CXX_EXTENSIONS OFF)
 endif()
