Merge topic 'set-sysroot'

de4da66 Use --sysroot when cross compiling.

Source/cmDocumentVariables.cxx

@@ -560,6 +560,16 @@ void cmDocumentVariables::DefineVariables(cmake* cm)
      false,
      "Variables That Change Behavior");
 
+    cm->DefineProperty
+    ("CMAKE_SYSROOT",  cmProperty::VARIABLE,
+     "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 if "
+     "necessary on installation.  The CMAKE_SYSROOT is also used to prefix "
+     "paths searched by the find_* commands.",
+     false,
+     "Variables That Change Behavior");
+
     cm->DefineProperty
     ("CMAKE_FIND_LIBRARY_PREFIXES",  cmProperty::VARIABLE,
      "Prefixes to prepend when looking for libraries.",