diff -ruNa percona-xtrabackup-percona-xtrabackup-2.3.6/cmake/build_configurations/compiler_options.cmake percona-xtrabackup-percona-xtrabackup-2.3.6_patched/cmake/build_configurations/compiler_options.cmake
--- percona-xtrabackup-percona-xtrabackup-2.3.6/cmake/build_configurations/compiler_options.cmake	2016-11-25 17:05:53.000000000 +0800
+++ percona-xtrabackup-percona-xtrabackup-2.3.6_patched/cmake/build_configurations/compiler_options.cmake	2021-07-16 21:10:47.260642064 +0800
@@ -25,7 +25,7 @@
 
   # Default GCC flags
   IF(CMAKE_COMPILER_IS_GNUCC)
-    SET(COMMON_C_FLAGS               "-g -fabi-version=2 -fno-omit-frame-pointer -fno-strict-aliasing")
+    SET(COMMON_C_FLAGS               "-g -fabi-version=2 -fno-omit-frame-pointer -fno-strict-aliasing -Wno-implicit-fallthrough -Wno-stringop-truncation -Wno-stringop-overflow")
     # Disable inline optimizations for valgrind testing to avoid false positives
     IF(WITH_VALGRIND)
       SET(COMMON_C_FLAGS             "-fno-inline ${COMMON_C_FLAGS}")