原文链接：https://www.yuque.com/cpptd/cmake/tifr91
cmake系列笔记：https://www.yuque.com/cpptd/cmake

include(CheckLanguage)
check_language( CSharp )
if( CMAKE_CSharp_COMPILER )
  enable_language( CSharp )
  set(CMAKE_SUPPORTS_CSHARP TRUE)
else()
  set(CMAKE_SUPPORTS_CSHARP FALSE)
endif()