Export cxx-standard with target. (#604)

Author: skasperski

CMakeLists.txt

@@ -7,10 +7,6 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CONFIG_PATH}")
 
 set(BTCPP_LIBRARY ${PROJECT_NAME})
 
-#---- Enable C++17 ----
-set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-
 if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
   message(STATUS "Setting build type to 'Release' as none was specified.")
   set(CMAKE_BUILD_TYPE "Release" CACHE
@@ -179,6 +175,8 @@ target_include_directories(${BTCPP_LIBRARY}
 target_compile_definitions(${BTCPP_LIBRARY} PRIVATE $<$<CONFIG:Debug>:TINYXML2_DEBUG>)
 target_compile_definitions(${BTCPP_LIBRARY} PUBLIC BTCPP_LIBRARY_VERSION="${CMAKE_PROJECT_VERSION}")
 
+target_compile_features(${BTCPP_LIBRARY} PUBLIC cxx_std_17)
+
 if(MSVC)
 else()
     target_compile_options(${BTCPP_LIBRARY} PRIVATE -Wall -Wextra)