When Cross Compiling for Android with NVIDIA Nsight Tegra Visual Studio Edition, this variable may be set to specify the default value for the ANDROID_STL_TYPE target property. See that target property for additional information.
When Cross Compiling for Android with the NDK, this variable may be set to specify the STL variant to be used. The value may be one of:
none system gabi++_static gabi++_shared gnustl_static gnustl_shared c++_static c++_shared stlport_static stlport_shared The default value is gnustl_static. Note that this default differs from the native NDK build system because CMake may be used to build projects for Android that are not natively implemented for it and use the C++ standard library.
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https://cmake.org/cmake/help/v3.12/variable/CMAKE_ANDROID_STL_TYPE.html