[cmake] add script to dump variables

cmake/DumpVariables.cmake

@@ -0,0 +1,9 @@
+function(dump_cmake_variables)
+  get_cmake_property(_variableNames VARIABLES)
+  list(SORT _variableNames)
+  foreach(_variableName ${_variableNames})
+    if((NOT DEFINED ARGV0) OR _variableName MATCHES ${ARGV0})
+      message(STATUS "${_variableName}=${${_variableName}}")
+    endif()
+  endforeach()
+endfunction()