Skip a few tests on targets that can't use the "run" commmand.

These tests want to use raw "run", so skip them on targets that can't
do that.

Also adds a small utility procedure that clearly conveys intent instead of
explicitly checking use_gdb_stub in the testcases.

This makes sure these testcases continue to be skipped with
--target_board=native-gdbserver once that board stops setting
is_remote.

gdb/testsuite/ChangeLog:
2017-10-13  Pedro Alves  <palves@redhat.com>

	* lib/gdb.exp (target_can_use_run_cmd): New procedure.
	* gdb.base/annota1.exp: Use it instead of is_remote.
	* gdb.base/annota3.exp: Use it instead of is_remote.
	* gdb.cp/annota2.exp: Use it instead of is_remote.
	* gdb.cp/annota3.exp: Use it instead of is_remote.
	* gdb.multi/bkpt-multi-exec.exp: Use it instead of is_remote.

gdb/testsuite/ChangeLog

@@ -1,3 +1,12 @@
+2017-10-13  Pedro Alves  <palves@redhat.com>
+
+	* lib/gdb.exp (target_can_use_run_cmd): New procedure.
+	* gdb.base/annota1.exp: Use it instead of is_remote.
+	* gdb.base/annota3.exp: Use it instead of is_remote.
+	* gdb.cp/annota2.exp: Use it instead of is_remote.
+	* gdb.cp/annota3.exp: Use it instead of is_remote.
+	* gdb.multi/bkpt-multi-exec.exp: Use it instead of is_remote.
+
 2017-10-13  Pedro Alves  <palves@redhat.com>
 
 	* gdb.base/testenv.exp: Check use_gdb_stub instead of is_remote.

gdb/testsuite/gdb.base/annota1.exp

@@ -16,12 +16,10 @@
 # This file was written by Elena Zannoni (ezannoni@cygnus.com)
 
 
-# are we on a target board? If so, don't run these tests.
-# note: this is necessary because we cannot use runto_main (which would
-# work for remote targets too) because of the different prompt we get
-# when using annotation level 2.
+# This testcase cannot use runto_main because of the different prompt
+# we get when using annotation level 2.
 #
-if [is_remote target] then {
+if ![target_can_use_run_cmd] {
     return 0
 }
 

gdb/testsuite/gdb.base/annota3.exp

@@ -16,12 +16,10 @@
 # This file was written by Elena Zannoni (ezannoni@cygnus.com)
 
 
-# are we on a target board? If so, don't run these tests.
-# note: this is necessary because we cannot use runto_main (which would
-# work for remote targets too) because of the different prompt we get
-# when using annotation level 2.
+# This testcase cannot use runto_main because of the different prompt
+# we get when using annotation level 2.
 #
-if [is_remote target] then {
+if ![target_can_use_run_cmd] {
     return 0
 }
 

gdb/testsuite/gdb.cp/annota2.exp

@@ -29,12 +29,10 @@ if {[prepare_for_testing "failed to prepare" $testfile $srcfile \
     return -1
 }
 
-# are we on a target board? If so, don't run these tests.
-# note: this is necessary because we cannot use runto_main (which would
-# work for remote targets too) because of the different prompt we get
-# when using annotation level 2.
+# This testcase cannot use runto_main because of the different prompt
+# we get when using annotation level 2.
 #
-if [is_remote target] then {
+if ![target_can_use_run_cmd] {
     return 0
 }
 

gdb/testsuite/gdb.cp/annota3.exp

@@ -29,12 +29,10 @@ if {[prepare_for_testing "failed to prepare" $testfile $srcfile \
     return -1
 }
 
-# are we on a target board? If so, don't run these tests.
-# note: this is necessary because we cannot use runto_main (which would
-# work for remote targets too) because of the different prompt we get
-# when using annotation level 2.
+# This testcase cannot use runto_main because of the different prompt
+# we get when using annotation level 2.
 #
-if [is_remote target] then {
+if ![target_can_use_run_cmd] {
     return 0
 }
 

gdb/testsuite/gdb.multi/bkpt-multi-exec.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 { [is_remote target] || ![isnative] } then {
+if ![target_can_use_run_cmd] {
     continue
 }
 

gdb/testsuite/lib/gdb.exp

@@ -226,6 +226,19 @@ proc delete_breakpoints {} {
     }
 }
 
+# Returns true iff the target supports using the "run" command.
+
+proc target_can_use_run_cmd {} {
+    if [target_info exists use_gdb_stub] {
+	# In this case, when we connect, the inferior is already
+	# running.
+	return 0
+    }
+
+    # Assume yes.
+    return 1
+}
+
 # Generic run command.
 #
 # The second pattern below matches up to the first newline *only*.