[PATCH] IntelFsp2Pkg/GenCfgOpt.py: Incremental build with UPD in sub DSC.

["Chiu, Chasel" <chasel.chiu@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3107

Current script only compares main DSC and output file datetime
to determine if re-generation required or not.
When UPD defined in sub DSC and was modified current script cannot
detect and will not re-generate output files which caused incremental
build issue.

Since UPD can be defined in any sub DSC the script has been updated
to compare all DSC datetime with output files to determine re-generation
is needed or not.

Cc: Maurice Ma <maurice.ma@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
---
 IntelFsp2Pkg/Tools/GenCfgOpt.py | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/IntelFsp2Pkg/Tools/GenCfgOpt.py b/IntelFsp2Pkg/Tools/GenCfgOpt.py
index af7e14a10a..a0b8bba81e 100644
--- a/IntelFsp2Pkg/Tools/GenCfgOpt.py
+++ b/IntelFsp2Pkg/Tools/GenCfgOpt.py
@@ -313,6 +313,7 @@ EndList
         self._DscFile     = ''
         self._FvDir       = ''
         self._MapVer      = 0
+        self._DscTime     = 0
 
     def ParseMacros (self, MacroDefStr):
         # ['-DABC=1', '-D', 'CFG_DEBUG=1', '-D', 'CFG_OUTDIR=Build']
@@ -423,6 +424,9 @@ EndList
         self._DscFile     = DscFile
         self._FvDir       = FvDir
 
+        # Initial DSC time is parent DSC time.
+        self._DscTime     = os.path.getmtime(DscFile)
+
         IsDefSect       = False
         IsPcdSect       = False
         IsUpdSect       = False
@@ -530,6 +534,12 @@ EndList
                                         if IncludeDsc == None:
                                             print("ERROR: Cannot open file '%s'" % IncludeFilePath)
                                             raise SystemExit
+
+                                        # Update DscTime when newer DSC time found.
+                                        CurrentDscTime = os.path.getmtime(os.path.realpath(IncludeDsc.name))
+                                        if CurrentDscTime > self._DscTime:
+                                            self._DscTime = CurrentDscTime
+
                                         NewDscLines = IncludeDsc.readlines()
                                         IncludeDsc.close()
                                         DscLines = NewDscLines + DscLines
@@ -815,9 +825,8 @@ EndList
         if not os.path.exists(OutPutFile):
             NoFileChange = False
         else:
-            DscTime = os.path.getmtime(self._DscFile)
             OutputTime = os.path.getmtime(OutPutFile)
-            if DscTime > OutputTime:
+            if self._DscTime > OutputTime:
                 NoFileChange = False
         return NoFileChange
 
-- 
2.28.0.windows.1