Merge pull request #19690 from donaldsharp/address-of-packed-member

build: Add warning for address of packed member

Author: Jafaral

configure.ac

@@ -483,6 +483,7 @@ AC_C_FLAG([-Wno-unused-parameter])
 AC_C_FLAG([-Wno-missing-field-initializers])
 AC_C_FLAG([-Wno-microsoft-anon-tag])
 AC_C_FLAG([-Wno-error=deprecated-declarations])
+AC_C_FLAG([-Waddress-of-packed-member])
 
 AC_C_FLAG([-Wc++-compat], [], [CXX_COMPAT_CFLAGS="-Wc++-compat"])
 AC_SUBST([CXX_COMPAT_CFLAGS])