CMake/Help/variable/CMAKE_SYSROOT.rst

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CMAKE_SYSROOT
-------------
Path to pass to the compiler in the ``--sysroot`` flag.
The ``CMAKE_SYSROOT`` content is passed to the compiler in the ``--sysroot``
flag, if supported. The path is also stripped from the RPATH/RUNPATH if
necessary on installation. The ``CMAKE_SYSROOT`` is also used to prefix
paths searched by the ``find_*`` commands.
This variable may only be set in a toolchain file specified by
the :variable:`CMAKE_TOOLCHAIN_FILE` variable.