In sparc systems glibc uses libgcc's unwinder to implement the
backtrace(3) function, defaulting to a simple non-dwarf unwinder if
libgcc_s doesn't provide a working _Unwind_Backtrace.
However, libgcc's unwinder uses .eh_frame instead of .frame_debug, and
.eh_frame is fully populated only if applications are built with
-fexceptions or -fasynchronous-unwind-tables.
This patch changes GCC to assume -fasynchronous-unwind-tables by default
in sparcv9 and sparc64, like other ports (notably x86) do.
Tested in both sparcv9-*-* and sparc64-*-* targets.
* common/config/sparc/sparc-common.c (sparc_option_init_struct):
New function.
(TARGET_OPTION_INIT_STRUCT): Defined.
---
gcc/ChangeLog | 6 ++++++
gcc/common/config/sparc/sparc-common.c | 10 ++++++++++
2 files changed, 16 insertions(+)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3a13f5f..ba7befe 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2016-02-25 Jose E. Marchesi <jose.march...@oracle.com>
+
+ * common/config/sparc/sparc-common.c (sparc_option_init_struct):
+ New function.
+ (TARGET_OPTION_INIT_STRUCT): Defined.
+
2016-02-25 Richard Biener <rguent...@suse.de>
PR tree-optimization/48795
diff --git a/gcc/common/config/sparc/sparc-common.c
b/gcc/common/config/sparc/sparc-common.c
index 3958b7e..1c5bc06 100644
--- a/gcc/common/config/sparc/sparc-common.c
+++ b/gcc/common/config/sparc/sparc-common.c
@@ -24,6 +24,14 @@ along with GCC; see the file COPYING3. If not see
#include "common/common-target.h"
#include "common/common-target-def.h"
+/* Implement TARGET_OPTION_INIT_STRUCT. */
+
+static void
+sparc_option_init_struct (struct gcc_options *opts)
+{
+ opts->x_flag_asynchronous_unwind_tables = 2;
+}
+
/* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */
static const struct default_options sparc_option_optimization_table[] =
{
@@ -31,6 +39,8 @@ static const struct default_options
sparc_option_optimization_table[] =
{ OPT_LEVELS_NONE, 0, NULL, 0 }
};
+#undef TARGET_OPTION_INIT_STRUCT
+#define TARGET_OPTION_INIT_STRUCT sparc_option_init_struct
#undef TARGET_DEFAULT_TARGET_FLAGS
#define TARGET_DEFAULT_TARGET_FLAGS TARGET_DEFAULT
#undef TARGET_OPTION_OPTIMIZATION_TABLE
--
2.3.4
