Testsuite: fully migrate to use_gdb_stub convenience func

In the GDB test suite, there are still multiple invocations of
"target_info exists use_gdb_stub".  However, the recommended way of
checking for use_gdb_stub is to call the convenience function of the same
name.

Replace these occurrences and just call "use_gdb_stub" instead.

gdb/testsuite/ChangeLog:

	* gdb.ada/exec_changed.exp: Replace "target_info exists
	use_gdb_stub" by "use_gdb_stub".
	* gdb.ada/start.exp: Likewise.
	* gdb.base/async-shell.exp: Likewise.
	* gdb.base/attach-pie-misread.exp: Likewise.
	* gdb.base/attach-wait-input.exp: Likewise.
	* gdb.base/break-entry.exp: Likewise.
	* gdb.base/break-interp.exp: Likewise.
	* gdb.base/dprintf-detach.exp: Likewise.
	* gdb.base/nostdlib.exp: Likewise.
	* gdb.base/solib-nodir.exp: Likewise.
	* gdb.base/statistics.exp: Likewise.
	* gdb.base/testenv.exp: Likewise.
	* gdb.mi/mi-exec-run.exp: Likewise.
	* gdb.mi/mi-start.exp: Likewise.
	* gdb.multi/dummy-frame-restore.exp: Likewise.
	* gdb.multi/multi-arch-exec.exp: Likewise.
	* gdb.multi/multi-arch.exp: Likewise.
	* gdb.multi/tids.exp: Likewise.
	* gdb.multi/watchpoint-multi.exp: Likewise.
	* gdb.python/py-events.exp: Likewise.
	* gdb.threads/attach-into-signal.exp: Likewise.
	* gdb.threads/attach-stopped.exp: Likewise.
	* gdb.threads/threadapply.exp: Likewise.
	* lib/selftest-support.exp: Likewise.

25 files changed, 52 insertions, 24 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index bbd0991..065b1c3 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,31 @@
+2018-03-23  Andreas Arnez  <arnez@linux.vnet.ibm.com>
+
+	* gdb.ada/exec_changed.exp: Replace "target_info exists
+	use_gdb_stub" by "use_gdb_stub".
+	* gdb.ada/start.exp: Likewise.
+	* gdb.base/async-shell.exp: Likewise.
+	* gdb.base/attach-pie-misread.exp: Likewise.
+	* gdb.base/attach-wait-input.exp: Likewise.
+	* gdb.base/break-entry.exp: Likewise.
+	* gdb.base/break-interp.exp: Likewise.
+	* gdb.base/dprintf-detach.exp: Likewise.
+	* gdb.base/nostdlib.exp: Likewise.
+	* gdb.base/solib-nodir.exp: Likewise.
+	* gdb.base/statistics.exp: Likewise.
+	* gdb.base/testenv.exp: Likewise.
+	* gdb.mi/mi-exec-run.exp: Likewise.
+	* gdb.mi/mi-start.exp: Likewise.
+	* gdb.multi/dummy-frame-restore.exp: Likewise.
+	* gdb.multi/multi-arch-exec.exp: Likewise.
+	* gdb.multi/multi-arch.exp: Likewise.
+	* gdb.multi/tids.exp: Likewise.
+	* gdb.multi/watchpoint-multi.exp: Likewise.
+	* gdb.python/py-events.exp: Likewise.
+	* gdb.threads/attach-into-signal.exp: Likewise.
+	* gdb.threads/attach-stopped.exp: Likewise.
+	* gdb.threads/threadapply.exp: Likewise.
+	* lib/selftest-support.exp: Likewise.
+
 2018-03-22  Andreas Arnez  <arnez@linux.vnet.ibm.com>
 
 	* gdb.base/info-proc.exp: Add test for "info proc cmdline".
diff --git a/gdb/testsuite/gdb.ada/exec_changed.exp b/gdb/testsuite/gdb.ada/exec_changed.exp
index 8070eec..943a751 100644
--- a/gdb/testsuite/gdb.ada/exec_changed.exp
+++ b/gdb/testsuite/gdb.ada/exec_changed.exp
@@ -19,7 +19,7 @@ if { [skip_ada_tests] } { return -1 }
 
 # This testcase verifies the behavior of the `start' command, which
 # does not work when we use the gdb stub...
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     untested "skipping tests due to use_gdb_stub"
     return
 }
diff --git a/gdb/testsuite/gdb.ada/start.exp b/gdb/testsuite/gdb.ada/start.exp
index 711f3df..cbf615e 100644
--- a/gdb/testsuite/gdb.ada/start.exp
+++ b/gdb/testsuite/gdb.ada/start.exp
@@ -19,7 +19,7 @@ if { [skip_ada_tests] } { return -1 }
 
 # This testcase verifies the behavior of the `start' command, which
 # does not work when we use the gdb stub...
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     untested "skipping test due to gdb stub"
     return
 }
diff --git a/gdb/testsuite/gdb.base/async-shell.exp b/gdb/testsuite/gdb.base/async-shell.exp
index c7782f4..37046d6 100644
--- a/gdb/testsuite/gdb.base/async-shell.exp
+++ b/gdb/testsuite/gdb.base/async-shell.exp
@@ -21,7 +21,7 @@ if { ![support_displaced_stepping] } {
 }
 
 # The testfile uses "run".  The real bug happened only for ![is_remote target].
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     return 0
 }
 
diff --git a/gdb/testsuite/gdb.base/attach-pie-misread.exp b/gdb/testsuite/gdb.base/attach-pie-misread.exp
index aa7710a..b693d3a 100644
--- a/gdb/testsuite/gdb.base/attach-pie-misread.exp
+++ b/gdb/testsuite/gdb.base/attach-pie-misread.exp
@@ -14,7 +14,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # This test only works on GNU/Linux.
-if { ![isnative] || [is_remote host] || [target_info exists use_gdb_stub]
+if { ![isnative] || [is_remote host] || [use_gdb_stub]
      || ![istarget *-linux*] || [skip_shlib_tests]} {
     continue
 }
diff --git a/gdb/testsuite/gdb.base/attach-wait-input.exp b/gdb/testsuite/gdb.base/attach-wait-input.exp
index 67abaa2..776cac8 100644
--- a/gdb/testsuite/gdb.base/attach-wait-input.exp
+++ b/gdb/testsuite/gdb.base/attach-wait-input.exp
@@ -29,7 +29,7 @@
 # simpler to do, so we test with both editing on and off.
 
 # The test uses the "attach" command.
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     return
 }
 
diff --git a/gdb/testsuite/gdb.base/break-entry.exp b/gdb/testsuite/gdb.base/break-entry.exp
index 8775b38..85de662 100644
--- a/gdb/testsuite/gdb.base/break-entry.exp
+++ b/gdb/testsuite/gdb.base/break-entry.exp
@@ -27,7 +27,7 @@
 
 standard_testfile start.c
 
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     untested "skipping tests due to use_gdb_stub"
     return
 }
diff --git a/gdb/testsuite/gdb.base/break-interp.exp b/gdb/testsuite/gdb.base/break-interp.exp
index a065d98..72117cb 100644
--- a/gdb/testsuite/gdb.base/break-interp.exp
+++ b/gdb/testsuite/gdb.base/break-interp.exp
@@ -14,7 +14,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # This test only works on GNU/Linux.
-if { ![isnative] || [is_remote host] || [target_info exists use_gdb_stub]
+if { ![isnative] || [is_remote host] || [use_gdb_stub]
      || ![istarget *-linux*] || [skip_shlib_tests]} {
     continue
 }
diff --git a/gdb/testsuite/gdb.base/dprintf-detach.exp b/gdb/testsuite/gdb.base/dprintf-detach.exp
index ed92c4a..4c3b33b 100644
--- a/gdb/testsuite/gdb.base/dprintf-detach.exp
+++ b/gdb/testsuite/gdb.base/dprintf-detach.exp
@@ -21,7 +21,7 @@
 load_lib gdbserver-support.exp
 
 # The test relies on "detach/attach".
-if { [target_info exists use_gdb_stub] } then {
+if { [use_gdb_stub] } then {
     return 0
 }
 
diff --git a/gdb/testsuite/gdb.base/nostdlib.exp b/gdb/testsuite/gdb.base/nostdlib.exp
index 54b6cb3..2ce2132 100644
--- a/gdb/testsuite/gdb.base/nostdlib.exp
+++ b/gdb/testsuite/gdb.base/nostdlib.exp
@@ -18,7 +18,7 @@ standard_testfile .c
 # If we're using a stub, breakpoints at the entry point will not trigger.
 # See also the comment in break-entry.exp.
 
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     untested "skipping tests due to use_gdb_stub"
     return
 }
diff --git a/gdb/testsuite/gdb.base/solib-nodir.exp b/gdb/testsuite/gdb.base/solib-nodir.exp
index 42314c8..911d614 100644
--- a/gdb/testsuite/gdb.base/solib-nodir.exp
+++ b/gdb/testsuite/gdb.base/solib-nodir.exp
@@ -25,7 +25,7 @@ if [is_remote target] {
 # We need to be able to influence the target's environment and working
 # directory.  Can't do that if when we connect the inferior is already
 # running.
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     return
 }
 
diff --git a/gdb/testsuite/gdb.base/statistics.exp b/gdb/testsuite/gdb.base/statistics.exp
index eb99ff4..c093b03 100644
--- a/gdb/testsuite/gdb.base/statistics.exp
+++ b/gdb/testsuite/gdb.base/statistics.exp
@@ -18,7 +18,7 @@ standard_testfile
 gdb_exit
 
 # Inlined default_gdb_start.
-set use_gdb_stub [target_info exists use_gdb_stub]
+set use_gdb_stub [use_gdb_stub]
 set res [remote_spawn host "$GDB $INTERNAL_GDBFLAGS $GDBFLAGS [host_info gdb_opts] -statistics"]
 if { $res < 0 || $res == "" } {
     perror "Spawning $GDB failed."
diff --git a/gdb/testsuite/gdb.base/testenv.exp b/gdb/testsuite/gdb.base/testenv.exp
index 4c123d9..4c4c6e6 100644
--- a/gdb/testsuite/gdb.base/testenv.exp
+++ b/gdb/testsuite/gdb.base/testenv.exp
@@ -20,7 +20,7 @@
 
 # Can't pass environment variables to the inferior if when we connect,
 # the inferior is already running.
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     return
 }
 
diff --git a/gdb/testsuite/gdb.mi/mi-exec-run.exp b/gdb/testsuite/gdb.mi/mi-exec-run.exp
index 7e1758f..ca3da5d 100644
--- a/gdb/testsuite/gdb.mi/mi-exec-run.exp
+++ b/gdb/testsuite/gdb.mi/mi-exec-run.exp
@@ -28,7 +28,7 @@ set MIFLAGS "-i=mi"
 
 # The purpose of this testcase is to test the -exec-run command. If we
 # cannot use it, then there is no point in running this testcase.
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
      untested "cannot use -exec-run command"
      return -1
 }
diff --git a/gdb/testsuite/gdb.mi/mi-start.exp b/gdb/testsuite/gdb.mi/mi-start.exp
index 64f7f47..185318a 100644
--- a/gdb/testsuite/gdb.mi/mi-start.exp
+++ b/gdb/testsuite/gdb.mi/mi-start.exp
@@ -19,7 +19,7 @@ set MIFLAGS "-i=mi"
 # The purpose of this testcase is to test the --start option of
 # the -exec-run command. If we cannot use the -exec-run command,
 # then there is no point in running this testcase...
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
      untested "cannot use -exec-run command"
      return -1
 }
diff --git a/gdb/testsuite/gdb.multi/dummy-frame-restore.exp b/gdb/testsuite/gdb.multi/dummy-frame-restore.exp
index 4372081..b5b012f 100644
--- a/gdb/testsuite/gdb.multi/dummy-frame-restore.exp
+++ b/gdb/testsuite/gdb.multi/dummy-frame-restore.exp
@@ -17,7 +17,7 @@ standard_testfile .c
 set executable ${testfile}
 
 # The plain remote target can't do multiple inferiors.
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     return
 }
 
diff --git a/gdb/testsuite/gdb.multi/multi-arch-exec.exp b/gdb/testsuite/gdb.multi/multi-arch-exec.exp
index eaaa9ec..9ff439d 100644
--- a/gdb/testsuite/gdb.multi/multi-arch-exec.exp
+++ b/gdb/testsuite/gdb.multi/multi-arch-exec.exp
@@ -19,7 +19,7 @@
 set testfile "multi-arch-exec"
 
 # The plain remote target can't do multiple inferiors.
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     return
 }
 
diff --git a/gdb/testsuite/gdb.multi/multi-arch.exp b/gdb/testsuite/gdb.multi/multi-arch.exp
index 61ab15b..3a90f02 100644
--- a/gdb/testsuite/gdb.multi/multi-arch.exp
+++ b/gdb/testsuite/gdb.multi/multi-arch.exp
@@ -19,7 +19,7 @@
 set testfile "multi-arch"
 
 # The plain remote target can't do multiple inferiors.
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     return
 }
 
diff --git a/gdb/testsuite/gdb.multi/tids.exp b/gdb/testsuite/gdb.multi/tids.exp
index 334e08e..67349b5 100644
--- a/gdb/testsuite/gdb.multi/tids.exp
+++ b/gdb/testsuite/gdb.multi/tids.exp
@@ -22,7 +22,7 @@ standard_testfile
 # Multiple inferiors are needed, therefore both native and extended
 # gdbserver modes are supported.  Only non-extended gdbserver is not
 # supported.
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     untested "using gdb stub"
     return
 }
diff --git a/gdb/testsuite/gdb.multi/watchpoint-multi.exp b/gdb/testsuite/gdb.multi/watchpoint-multi.exp
index 5234304..bba1b90 100644
--- a/gdb/testsuite/gdb.multi/watchpoint-multi.exp
+++ b/gdb/testsuite/gdb.multi/watchpoint-multi.exp
@@ -18,7 +18,7 @@ set executable ${testfile}
 
 # Multiple inferiors are needed, therefore both native and extended gdbserver
 # modes are supported.  Only non-extended gdbserver is not supported.
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     untested "using gdb stub"
     return
 }
diff --git a/gdb/testsuite/gdb.python/py-events.exp b/gdb/testsuite/gdb.python/py-events.exp
index 26cc802..5109e7a 100644
--- a/gdb/testsuite/gdb.python/py-events.exp
+++ b/gdb/testsuite/gdb.python/py-events.exp
@@ -13,7 +13,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-if [target_info exists use_gdb_stub] {
+if [use_gdb_stub] {
     return 0
 }
 
diff --git a/gdb/testsuite/gdb.threads/attach-into-signal.exp b/gdb/testsuite/gdb.threads/attach-into-signal.exp
index 446f00c..4a0a670 100644
--- a/gdb/testsuite/gdb.threads/attach-into-signal.exp
+++ b/gdb/testsuite/gdb.threads/attach-into-signal.exp
@@ -17,7 +17,7 @@
 # This file was created by Jan Kratochvil <jan.kratochvil@redhat.com>.
 
 # This test only works on Linux
-if { ![isnative] || [is_remote host] || [target_info exists use_gdb_stub]
+if { ![isnative] || [is_remote host] || [use_gdb_stub]
      || ![istarget *-linux*] } {
     continue
 }
diff --git a/gdb/testsuite/gdb.threads/attach-stopped.exp b/gdb/testsuite/gdb.threads/attach-stopped.exp
index 6c8c8bf..a3916c6 100644
--- a/gdb/testsuite/gdb.threads/attach-stopped.exp
+++ b/gdb/testsuite/gdb.threads/attach-stopped.exp
@@ -18,7 +18,7 @@
 # This file was updated by Jan Kratochvil <jan.kratochvil@redhat.com>.
 
 # This test only works on Linux
-if { ![isnative] || [is_remote host] || [target_info exists use_gdb_stub]
+if { ![isnative] || [is_remote host] || [use_gdb_stub]
      || ![istarget *-linux*] } {
     continue
 }
diff --git a/gdb/testsuite/gdb.threads/threadapply.exp b/gdb/testsuite/gdb.threads/threadapply.exp
index fc8aac6..8979ee3 100644
--- a/gdb/testsuite/gdb.threads/threadapply.exp
+++ b/gdb/testsuite/gdb.threads/threadapply.exp
@@ -105,7 +105,7 @@ proc kill_and_remove_inferior {thread_set} {
 
     # The test starts multiple inferiors, therefore non-extended
     # remote is not supported.
-    if [target_info exists use_gdb_stub] {
+    if [use_gdb_stub] {
 	unsupported "using gdb stub"
 	return
     }
diff --git a/gdb/testsuite/lib/selftest-support.exp b/gdb/testsuite/lib/selftest-support.exp
index 89e2e3f..f7169e0 100644
--- a/gdb/testsuite/lib/selftest-support.exp
+++ b/gdb/testsuite/lib/selftest-support.exp
@@ -140,7 +140,7 @@ proc do_self_tests {function body} {
     # ... or with a stub-like server?  I.e., gdbserver + "target
     # remote"?  In that case we won't be able to pass command line
     # arguments to GDB, and selftest_setup wants to do exactly that.
-    if [target_info exists use_gdb_stub] {
+    if [use_gdb_stub] {
 	return
     }