[PATCH] Use "maint ignore-probes" in no-libstdcxx-probe.exp

[Tom Tromey <tromey@adacore.com>]

While looking at some test output, I saw that no-libstdcxx-probe.exp
was not being run.  However, it occurred to me that Tom de Vries' new
"maint ignore-probes" command could be used to enable this test
unconditionally.
---
 gdb/testsuite/gdb.cp/no-libstdcxx-probe.exp | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/gdb/testsuite/gdb.cp/no-libstdcxx-probe.exp b/gdb/testsuite/gdb.cp/no-libstdcxx-probe.exp
index b10daa638e6..752298af55d 100644
--- a/gdb/testsuite/gdb.cp/no-libstdcxx-probe.exp
+++ b/gdb/testsuite/gdb.cp/no-libstdcxx-probe.exp
@@ -21,12 +21,11 @@ if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
     return -1
 }
 
-if {![runto_main]} {
-    return -1
-}
+# This tests that $_exception gives an error when the systemtap probes
+# are not available, so simulate this by disabling them.
+gdb_test "maint ignore-probes libstdcxx .*" ".*OBJNAME: ''"
 
-if { [skip_libstdcxx_probe_tests] == 0 } {
-    untested "Have libstdc++ stap probe"
+if {![runto_main]} {
     return -1
 }
 
-- 
2.38.1