Index: lib/sanitizer_common/sanitizer_common.cc
===================================================================
--- lib/sanitizer_common/sanitizer_common.cc
+++ lib/sanitizer_common/sanitizer_common.cc
@@ -489,7 +489,7 @@
   report_file.fd_pid = internal_getpid();
 }
 
-void __sanitizer_report_error_summary(const char *error_summary) {
+WEAK_DEF(void, __sanitizer_report_error_summary, const char *error_summary) {
   Printf("%s\n", error_summary);
 }
 
Index: lib/sanitizer_common/sanitizer_common_libcdep.cc
===================================================================
--- lib/sanitizer_common/sanitizer_common_libcdep.cc
+++ lib/sanitizer_common/sanitizer_common_libcdep.cc
@@ -162,8 +162,8 @@
 
 }  // namespace __sanitizer
 
-void NOINLINE
-__sanitizer_sandbox_on_notify(__sanitizer_sandbox_arguments *args) {
+WEAK_DEF(void, __sanitizer_sandbox_on_notify,
+         __sanitizer_sandbox_arguments *args) {
   __sanitizer::PrepareForSandboxing(args);
   if (__sanitizer::sandboxing_callback)
     __sanitizer::sandboxing_callback();