[ASan] [SystemZ] Add -mbackchain to test cflags.

Marcin Koscielnicki · Marcin Koscielnicki · commit 1598698fcd6f · 2016-05-12T08:49:34.000Z
This is needed for proper operation of the fast unwinder, see the discussion on D18895. Differential Revision: http://reviews.llvm.org/D19898 llvm-svn: 269277
diff --git a/compiler-rt/test/asan/lit.cfg b/compiler-rt/test/asan/lit.cfg
@@ -73,6 +73,8 @@ clang_asan_static_cflags = (["-fsanitize=address",
                             "-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:
