dbSta: propagate clock signal type when Liberty loaded after LEF

Ensure that when Liberty timing libraries are loaded after LEF macro files, the OpenDB master terms (dbMTerm) correctly receive the CLOCK signal type. This aligns the LEF-first loading order behavior with the Liberty-first behavior.

Signed-off-by: Mohnish <kmohnishm@gmail.com>

Author: KMohnishM

src/dbSta/src/dbNetwork.cc

@@ -2425,6 +2425,20 @@ void dbNetwork::readLibertyAfter(LibertyLibrary* lib)
               if (lport) {
                 cport->setLibertyPort(lport);
                 lport->setExtPort(cport->extPort());
+                dbMTerm* mterm = staToDb(lport);
+                if (mterm && lport->isClock()
+                    && mterm->getSigType() != dbSigType::CLOCK) {
+                  debugPrint(
+                      logger_,
+                      utl::ORD,
+                      "dbNetwork",
+                      1,
+                      "Updating LEF pin {}/{} from {} to CLOCK from Liberty",
+                      mterm->getMaster()->getName(),
+                      mterm->getName(),
+                      mterm->getSigType().getString());
+                  mterm->setSigType(dbSigType::CLOCK);
+                }
               } else if (!cport->direction()->isPowerGround()
                          && !lcell->findPort(port_name)) {
                 logger_->warn(ORD,

src/gpl/test/mbff_test.cpp

@@ -70,10 +70,10 @@ class MBFFTestFixture : public tst::Fixture
                                               opendp_.get(),
                                               estimate_parasitics_.get());
 
-    readLiberty(getFilePath("openroad/src/gpl/test/library/test/test0.lib"));
     loadTechAndLib("test0",
                    "test0",
                    getFilePath("openroad/src/gpl/test/library/test/test0.lef"));
+    readLiberty(getFilePath("openroad/src/gpl/test/library/test/test0.lib"));
 
     chip_ = odb::dbChip::create(db_.get(), db_->getTech());
     block_ = odb::dbBlock::create(chip_, "top");