Imprecise documentation on automatic _GLIBCXX_USE_CXX11_ABI?

[chubei-oppen]

The documentation says If you are using the CMake build helper or the AutotoolsBuildEnvironment build helper Conan will automatically adjust the _GLIBCXX_USE_CXX11_ABI flag to manage the ABI.

However, I can only get that working using cmake generator and calling conan_basic_setup in my CMakeLists.txt.