define a bunch of backwards compatibility variables
CMAKE_ANSI_CXXFLAGS - flag for ansi c++ CMAKE_HAS_ANSI_STRING_STREAM - has <strstream> include(TestForANSIStreamHeaders) include(CheckIncludeFileCXX) include(TestForSTDNamespace) include(TestForANSIForScope)
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https://cmake.org/cmake/help/v3.19/module/CMakeBackwardCompatibilityCXX.html