riscv: Enable -fasynchronous-unwind-tables by default on Linux

This follows the example of aarch64.

gcc/:
	* common/config/riscv/riscv-common.cc
	(riscv_option_optimization_table)
	[TARGET_DEFAULT_ASYNC_UNWIND_TABLES]: Enable
	-fasynchronous-unwind-tables and -funwind-tables.
	* config.gcc (riscv*-*-linux*): Define
	TARGET_DEFAULT_ASYNC_UNWIND_TABLES.

diff --git a/gcc/common/config/riscv/riscv-common.cc b/gcc/common/config/riscv/riscv-common.cc
index 2e3116e..616e2f8 100644 (file)
--- a/gcc/common/config/riscv/riscv-common.cc
+++ b/gcc/common/config/riscv/riscv-common.cc
@@ -1756,6 +1756,10 @@ static const struct default_options riscv_option_optimization_table[] =
   {
     { OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 },
     { 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 --git a/gcc/config.gcc b/gcc/config.gcc
index 89f5604..744b46f 100644 (file)
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -2417,6 +2417,7 @@ riscv*-*-linux*)
        *) echo "Unknown value for enable_multilib"; exit 1
        esac
        tmake_file="${tmake_file} riscv/t-riscv riscv/t-linux"
+       tm_defines="${tm_defines} TARGET_DEFAULT_ASYNC_UNWIND_TABLES=1"
        gnu_ld=yes
        gas=yes
        case $target in