diff -N -urp a/gcc/common/config/aarch64/aarch64-common.c b/gcc/common/config/aarch64/aarch64-common.c
--- a/gcc/common/config/aarch64/aarch64-common.c	2019-07-02 09:28:49.798701181 +0800
+++ b/gcc/common/config/aarch64/aarch64-common.c	2019-07-02 09:30:15.436282799 +0800
@@ -51,6 +51,10 @@ static const struct default_options aarc
     { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 },
     /* Enable redundant extension instructions removal at -O2 and higher.  */
     { OPT_LEVELS_2_PLUS, OPT_free, NULL, 1 },
+#if (TARGET_DEFAULT_ASYNC_UNWIND_TABLES == 1)
+    { OPT_LEVELS_ALL, OPT_fasynchronous_unwind_tables, NULL, 1 },
+    { OPT_LEVELS_ALL, OPT_funwind_tables, NULL, 1},
+#endif
     { OPT_LEVELS_NONE, 0, NULL, 0 }
   };
 
diff -N -urp a/gcc/config.gcc b/gcc/config.gcc
--- a/gcc/config.gcc	2019-07-02 09:28:50.114701170 +0800
+++ b/gcc/config.gcc	2019-07-02 09:31:50.636196118 +0800
@@ -966,6 +966,7 @@ aarch64*-*-linux*)
 	tm_file="${tm_file} dbxelf.h elfos.h gnu-user.h linux.h glibc-stdint.h"
 	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-linux.h"
 	tmake_file="${tmake_file} aarch64/t-aarch64 aarch64/t-aarch64-linux"
+	tm_defines="${tm_defines}  TARGET_DEFAULT_ASYNC_UNWIND_TABLES=1"
 	case $target in
 	aarch64_be-*)
 		tm_defines="${tm_defines} TARGET_BIG_ENDIAN_DEFAULT=1"