[patch] callfuncs.exp: set unwindonsignal on

[dje@google.com]

Hi.

Testing cvs head with i686 binaries and 64-bit gdb has this failure:
FAIL: gdb.base/callfuncs.exp: gdb function calls preserve register contents
[I'm guessing the same failure will be seen with 32-bit native.]

The problem is that these tests segv (and are marked KFAIL),
but the stack isn't unwound.

	setup_kfail_for_target gdb/12783 "i?86-*-*"
	setup_kfail_for_target gdb/12796 "x86_64-*-*"
	gdb_test "p t_structs_dc(struct_val1)" ".*= 4 \\+ 4 \\* I" \
	    "call inferior func with struct - returns double _Complex"

	setup_kfail_for_target gdb/12783 "i?86-*-*"
	setup_kfail_for_target gdb/12796 "x86_64-*-*"
	gdb_test "p t_structs_ldc(struct_val1)" "= 5 \\+ 5 \\* I" \
	    "call inferior func with struct - returns long double _Complex"

I don't see a problem with setting unwindonsignal - failure to produce
the expected result will still be caught.
And if any test modifies the original register values, that'll still be
caught too.

I'll check this in in a few days if there are no objections.

2012-09-14  Doug Evans  <dje@google.com>

	* gdb.base/callfuncs.exp (do_function_calls): Set unwindonsignal to on
	while running the tests.

Index: callfuncs.exp
===================================================================
RCS file: /cvs/src/src/gdb/testsuite/gdb.base/callfuncs.exp,v
retrieving revision 1.52
diff -u -p -r1.52 callfuncs.exp
--- callfuncs.exp	9 Jul 2012 14:20:52 -0000	1.52
+++ callfuncs.exp	14 Sep 2012 22:29:09 -0000
@@ -65,6 +65,10 @@ proc do_function_calls {} {
     # We need to up this because this can be really slow on some boards.
     set timeout 60;
 
+    # If any of these calls segv we don't want to affect subsequent tests.
+    # E.g., we want to ensure register values are restored.
+    gdb_test_no_output "set unwindonsignal on"
+
     gdb_test "p t_char_values(0,0)" " = 0"
     gdb_test "p t_char_values('a','b')" " = 1"
     gdb_test "p t_char_values(char_val1,char_val2)" " = 1"
@@ -259,6 +263,9 @@ proc do_function_calls {} {
 
     gdb_test "p t_structs_a(struct_val1)" "= (.unsigned char .. )?<buf.*> \"foo\"" \
     	"call inferior func with struct - returns char *"
+
+    # Restore default value.
+    gdb_test_no_output "set unwindonsignal off"
 }
 
 # Procedure to get current content of all registers.