Index: compiler-rt/trunk/test/asan/lit.cfg
===================================================================
--- compiler-rt/trunk/test/asan/lit.cfg
+++ compiler-rt/trunk/test/asan/lit.cfg
@@ -73,6 +73,8 @@
                             "-fno-omit-frame-pointer",
                             "-fno-optimize-sibling-calls"] +
                             config.debug_info_flags + target_cflags)
+if config.target_arch == 's390x':
+  clang_asan_static_cflags.append("-mbackchain")
 clang_asan_static_cxxflags = config.cxx_mode_flags + clang_asan_static_cflags
 
 if config.asan_dynamic: