[Patch AArch64] Turn on -fasynchronous-unwind-tables and -funwind-tables by default

2018-03-27  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

	* config.gcc (aarch64*-*-linux*): New TARGET_DEFAULT_ASYNC_UNWIND_TABLES
	* common/config/aarch64/aarch64-common.c (aarch64_optimization_table[]):
	Turn on fasynchronous-unwind-tables and funwind-tables.

From-SVN: r258871

gcc/ChangeLog

+2018-03-27  Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>
+
+	* config.gcc (aarch64*-*-linux*): New TARGET_DEFAULT_ASYNC_UNWIND_TABLES
+	* common/config/aarch64/aarch64-common.c (aarch64_optimization_table[]):
+	Turn on fasynchronous-unwind-tables and funwind-tables.
+
 2018-03-26  Uros Bizjak  <ubizjak@gmail.com>
 
 	PR target/85073

gcc/common/config/aarch64/aarch64-common.c

@@ -53,6 +53,10 @@ static const struct default_options aarch_option_optimization_table[] =
     { 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 }
   };
 

gcc/config.gcc

@@ -983,6 +983,7 @@ 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"