update documentation

utils/python/CIME/SystemTests/system_tests_compare_two.py

@@ -21,6 +21,14 @@
     that's needed in both cases. This is called before _case_one_setup or
     _case_two_setup.
 
+(2) _case_one_build
+    This method will be called to build case one when separate_builds is True
+
+(2) _case_two_build
+    This method will be called to build case two when separate_builds is True
+
+
+
 """
 
 from CIME.XML.standard_module_setup import *
@@ -135,16 +143,16 @@ def _common_setup(self):
     # Main public methods
     # ========================================================================
     def _case_one_build(self, sharedlib_only=False, model_only=False):
-        self._activate_case1()
         self.build_indv(sharedlib_only=sharedlib_only, model_only=model_only)
 
     def _case_two_build(self, sharedlib_only=False, model_only=False):
-        self._activate_case2()
         self.build_indv(sharedlib_only=sharedlib_only, model_only=model_only)
 
     def build_phase(self, sharedlib_only=False, model_only=False):
         if self._separate_builds:
+            self._activate_case1()
             self._case_one_build(sharedlib_only, model_only)
+            self._activate_case2()
             self._case_two_build(sharedlib_only, model_only)
         else:
             self._activate_case1()