RFA: two Ada tests -vs- debug-file-directory

[Tom Tromey <tromey@redhat.com>]

I was seeing test regressions in some Ada tests and tracked it down to
the fact that one tree was build with the correct system
debug-file-directory setting, and one was built with a different
setting.

I have all the GCC debuginfo installed on this machine, but the
apparently-failing Ada tests are not prepared to see this.

The appended handles the problem by ensuring that gdb doesn't see the
system debuginfo during the tests in question.

Ok?

Tom

2012-03-05  Tom Tromey  <tromey@redhat.com>

	* gdb.ada/operator_bp.exp: Clear debug-file-directory.
	* gdb.ada/mi_task_arg.exp: Clear debug-file-directory.

diff --git a/gdb/testsuite/gdb.ada/mi_task_arg.exp b/gdb/testsuite/gdb.ada/mi_task_arg.exp
index a8cc59b..0b2013c 100644
--- a/gdb/testsuite/gdb.ada/mi_task_arg.exp
+++ b/gdb/testsuite/gdb.ada/mi_task_arg.exp
@@ -37,6 +37,9 @@ mi_delete_breakpoints
 mi_gdb_reinitialize_dir $srcdir/$subdir
 mi_gdb_load ${binfile}
 
+# This test won't work properly if system debuginfo is installed.
+mi_gdb_test "-gdb-set debug-file-directory \"\"" ".*"
+
 if ![mi_runto "task_switch.break_me"] then {
    fail "Cannot run to main, testcase aborted"
    return 0
diff --git a/gdb/testsuite/gdb.ada/operator_bp.exp b/gdb/testsuite/gdb.ada/operator_bp.exp
index 2be7e0a..18cf46d 100644
--- a/gdb/testsuite/gdb.ada/operator_bp.exp
+++ b/gdb/testsuite/gdb.ada/operator_bp.exp
@@ -29,6 +29,9 @@ if {[gdb_compile_ada "${srcfile}" "${binfile}" executable {debug}] != ""} {
 
 clean_restart ${testfile}
 
+# This test won't work properly if system debuginfo is installed.
+gdb_test_no_output "set debug-file-directory"
+
 set bp_location [gdb_get_line_number "BEGIN" ${testdir}/ops_test.adb]
 runto "ops_test.adb:$bp_location"