This argument allows to set specific sysroot pass which will be used for building LLDB API test programs. It might come in handy for setting up cross-platform remote runs of API tests on Windows host. It can be useful for cross-compiling LLDB API tests. The argument can be set using `LLDB_TEST_USER_ARGS` argument: ``` cmake ... -DLLDB_TEST_USER_ARGS="...;--sysroot;C:\path\to\sysroot;..." ... ```