gdb/testsuite: Add a way to send multiple init commands

Right now we provide a board info entry, `gdb_init_command', that allows
one to send a single command to GDB before the program to be debugged is
started.  This is useful e.g. for slow remote targets to change the
default "remotetimeout" setting.  Occasionally I found a need to send
multiple commands instead, however this cannot be achieved with
`gdb_init_command'.

This change therefore extends the mechanism by adding a TCL list of GDB
commands to send, via a board info entry called `gdb_init_commands'.
There is no limit as to the number of commands put there.  The old
`gdb_init_command' mechanism remains supported for compatibility with
existing people's environments.

	* lib/gdb-utils.exp: New file.
	* lib/gdb.exp (gdb_run_cmd): Call gdb_init_commands, replacing
	inline `gdb_init_command' processing.
	(gdb_start_cmd): Likewise.
	* lib/mi-support.exp (mi_run_cmd): Likewise.
	* README: Document `gdb_init_command' and `gdb_init_commands'.

gdb/testsuite/ChangeLog

@@ -1,3 +1,13 @@
+2014-07-12  Maciej W. Rozycki  <macro@mips.com>
+	    Maciej W. Rozycki  <macro@codesourcery.com>
+
+	* lib/gdb-utils.exp: New file.
+	* lib/gdb.exp (gdb_run_cmd): Call gdb_init_commands, replacing
+	inline `gdb_init_command' processing.
+	(gdb_start_cmd): Likewise.
+	* lib/mi-support.exp (mi_run_cmd): Likewise.
+	* README: Document `gdb_init_command' and `gdb_init_commands'.
+
 2014-07-11  Jan Kratochvil  <jan.kratochvil@redhat.com>
 
 	Fix false FAIL running under a very long directory name.

gdb/testsuite/README

@@ -271,6 +271,16 @@ gdb,use_precord
 
   The board supports process record.
 
+gdb_init_command
+gdb_init_commands
+
+  Commands to send to GDB every time a program is about to be run.  The
+  first of these settings defines a single command as a string.  The
+  second defines a TCL list of commands being a string each.  The commands
+  are sent one by one in a sequence, first from `gdb_init_command', if any,
+  followed by individual commands from `gdb_init_command', if any, in this
+  list's order.
+
 gdb_server_prog
 
   The location of GDBserver.  If GDBserver somewhere other than its

gdb/testsuite/lib/gdb-utils.exp

@@ -0,0 +1,30 @@
+# Copyright 2014 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Utility procedures, shared between test suite domains.
+
+# A helper procedure to retrieve commands to send to GDB before a program
+# is started.
+
+proc gdb_init_commands {} {
+    set commands ""
+    if [target_info exists gdb_init_command] {
+	lappend commands [target_info gdb_init_command]
+    }
+    if [target_info exists gdb_init_commands] {
+	set commands [concat $commands [target_info gdb_init_commands]]
+    }
+    return $commands
+}

gdb/testsuite/lib/gdb.exp

@@ -27,6 +27,7 @@ if {$tool == ""} {
 
 load_lib libgloss.exp
 load_lib cache.exp
+load_lib gdb-utils.exp
 
 global GDB
 
@@ -209,8 +210,8 @@ proc delete_breakpoints {} {
 proc gdb_run_cmd {args} {
     global gdb_prompt use_gdb_stub
 
-    if [target_info exists gdb_init_command] {
-	send_gdb "[target_info gdb_init_command]\n"
+    foreach command [gdb_init_commands] {
+	send_gdb "$command\n"
 	gdb_expect 30 {
 	    -re "$gdb_prompt $" { }
 	    default {
@@ -311,8 +312,8 @@ proc gdb_run_cmd {args} {
 proc gdb_start_cmd {args} {
     global gdb_prompt use_gdb_stub
 
-    if [target_info exists gdb_init_command] {
-	send_gdb "[target_info gdb_init_command]\n"
+    foreach command [gdb_init_commands] {
+	send_gdb "$command\n"
 	gdb_expect 30 {
 	    -re "$gdb_prompt $" { }
 	    default {

gdb/testsuite/lib/mi-support.exp

@@ -17,6 +17,8 @@
 
 # Test setup routines that work with the MI interpreter.
 
+load_lib gdb-utils.exp
+
 # The variable mi_gdb_prompt is a regexp which matches the gdb mi prompt.
 # Set it if it is not already set.
 global mi_gdb_prompt
@@ -859,8 +861,8 @@ proc mi_run_cmd_full {use_mi_command args} {
 	set run_match ""
     }
 
-    if [target_info exists gdb_init_command] {
-	send_gdb "[target_info gdb_init_command]\n"
+    foreach command [gdb_init_commands] {
+	send_gdb "$command\n"
 	gdb_expect 30 {
 	    -re "$mi_gdb_prompt$" { }
 	    default {