use -add-tracefile to sanitize coverage.info

debian/rules

@@ -44,6 +44,7 @@ override_dh_auto_install:
 ifeq ($(ENABLE_GCOV), y)
 	mkdir -p debian/swss/tmp/gcov
 	lcov -c --directory . --no-external --exclude "$(shell pwd)/tests/*" --exclude "$(shell pwd)/**/tests/*" --ignore-errors gcov --output-file coverage.info
+	lcov -a coverage.info -o coverage.info 
 	lcov_cobertura coverage.info -o coverage.xml
 	find ./ -type f -regex '.*\.\(h\|cpp\|gcno\|info\)' | tar -cf debian/swss/tmp/gcov/gcov-source.tar -T -
 endif

tests/conftest.py

@@ -462,7 +462,7 @@ def collect_coverage(self):
                 self.runcmd('supervisorctl stop all')
 
             # Generate the converage info by lcov and copy to the host
-            cmd = f"docker exec {self.ctn.short_id} sh -c 'cd $BUILD_DIR; rm -rf **/.libs ./lib/libSaiRedis*; lcov -c --directory . --no-external --exclude tests --ignore-errors gcov,unused --output-file /tmp/coverage.info; sed -i \"s#SF:$BUILD_DIR/#SF:#\" /tmp/coverage.info; lcov_cobertura /tmp/coverage.info -o /tmp/coverage.xml'"
+            cmd = f"docker exec {self.ctn.short_id} sh -c 'cd $BUILD_DIR; rm -rf **/.libs ./lib/libSaiRedis*; lcov -c --directory . --no-external --exclude tests --ignore-errors gcov,unused --output-file /tmp/coverage.info && lcov --add-tracefile /tmp/coverage.info -o /tmp/coverage.info; sed -i \"s#SF:$BUILD_DIR/#SF:#\" /tmp/coverage.info; lcov_cobertura /tmp/coverage.info -o /tmp/coverage.xml'"
             subprocess.getstatusoutput(cmd)
             cmd = f"docker exec {self.ctn.short_id} sh -c 'cd $BUILD_DIR; find . -name *.gcda -type f   -exec tar -rf /tmp/gcda.tar {{}} \\;'"
             subprocess.getstatusoutput(cmd)