Added in version 3.4.
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 No C++ Support
system Minimal C++ without STL
gabi++_static GAbi++ Static
gabi++_shared GAbi++ Shared
gnustl_static GNU libstdc++ Static
gnustl_shared GNU libstdc++ Shared
c++_static LLVM libc++ Static
c++_shared LLVM libc++ Shared
stlport_static STLport Static
stlport_shared STLport Shared
The default value is gnustl_static on NDK versions that provide it and otherwise c++_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/v3.31/variable/CMAKE_ANDROID_STL_TYPE.html