--- a/build/moz.configure/warnings.configure
+++ b/build/moz.configure/warnings.configure
@@ -88,16 +88,26 @@ check_and_add_gcc_warning('-Wno-error=ma
 
 # we don't want our builds held hostage when a platform-specific API
 # becomes deprecated.
 check_and_add_gcc_warning('-Wno-error=deprecated-declarations')
 
 # false positives depending on optimization
 check_and_add_gcc_warning('-Wno-error=array-bounds')
 
+# only enabled in LTO build, and we apparently don't care about these warnings
+check_and_add_gcc_warning('-Wno-error=odr')
+check_and_add_gcc_warning('-Wno-error=lto-type-mismatch')
+
+# add suggestions for final keywords in LTO builds
+check_and_add_gcc_warning('-Wsuggest-final-types')
+check_and_add_gcc_warning('-Wno-error=suggest-final-types')
+check_and_add_gcc_warning('-Wsuggest-final-methods')
+check_and_add_gcc_warning('-Wno-error=suggest-final-methods')
+
 # can't get rid of those PGO warnings
 check_and_add_gcc_warning('-Wno-error=coverage-mismatch', when='MOZ_PGO')
 
 # false positives depending on optimizations
 check_and_add_gcc_warning('-Wno-error=free-nonheap-object')
 
 # catches format/argument mismatches with printf
 c_format_warning, cxx_format_warning = check_and_add_gcc_warning(