[PATCH 1/2] Add "set remote multiprocess-extensions-packet" command

[Pedro Alves <palves@redhat.com>]

Being able to force-disable the RSP multiprocess extensions is useful
for testing.

gdb/ChangeLog:
2015-08-24  Pedro Alves  <palves@redhat.com>

	* NEWS (New commands): Mention set/show remote
	multiprocess-extensions-packet.
	* remote.c (remote_query_supported): Only tell the server to use
	the multiprocess extensions if the user hasn't force-disabled them
	with "set remote multiprocess-extensions-packet off".

gdb/doc/ChangeLog:
2015-08-24  Pedro Alves  <palves@redhat.com>

	* gdb.texinfo (Remote Configuration): Document the "set/show
	remote multiprocess-extensions-packet" commands.
---
 gdb/NEWS            | 4 ++++
 gdb/doc/gdb.texinfo | 4 ++++
 gdb/remote.c        | 7 +++++--
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/gdb/NEWS b/gdb/NEWS
index 9edfd5e..cc1866f 100644
--- a/gdb/NEWS
+++ b/gdb/NEWS
@@ -28,6 +28,10 @@ set debug bfd-cache
 show debug bfd-cache
   Control display of debugging info regarding bfd caching.
 
+set remote multiprocess-extensions-packet
+show remote multiprocess-extensions--packet
+  Set/show the use of the remote protocol multiprocess extensions.
+
 * The "disassemble" command accepts a new modifier: /s.
   It prints mixed source+disassembly like /m with two differences:
   - disassembled instructions are now printed in program order, and
diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 5dfb14b..cd0abad 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -20205,6 +20205,10 @@ are:
 @tab @code{Z0 and Z1}
 @tab @code{Support for target-side breakpoint condition evaluation}
 
+@item @code{multiprocess-extensions}
+@tab @code{multiprocess extensions}
+@tab Debug multiple processes and remote process PID awareness
+
 @item @code{swbreak-feature}
 @tab @code{swbreak stop reason}
 @tab @code{break}
diff --git a/gdb/remote.c b/gdb/remote.c
index 12294bc..a06037f 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -4352,7 +4352,8 @@ remote_query_supported (void)
       char *q = NULL;
       struct cleanup *old_chain = make_cleanup (free_current_contents, &q);
 
-      q = remote_query_supported_append (q, "multiprocess+");
+      if (packet_set_cmd_state (PACKET_multiprocess_feature) != AUTO_BOOLEAN_FALSE)
+	q = remote_query_supported_append (q, "multiprocess+");
 
       if (packet_set_cmd_state (PACKET_swbreak_feature) != AUTO_BOOLEAN_FALSE)
 	q = remote_query_supported_append (q, "swbreak+");
@@ -13231,6 +13232,9 @@ Show the maximum size of the address (in bits) in a memory packet."), NULL,
   add_packet_config_cmd (&remote_protocol_packets[PACKET_Qbtrace_conf_bts_size],
        "Qbtrace-conf:bts:size", "btrace-conf-bts-size", 0);
 
+  add_packet_config_cmd (&remote_protocol_packets[PACKET_multiprocess_feature],
+       "multiprocess-feature", "multiprocess-feature", 0);
+
   add_packet_config_cmd (&remote_protocol_packets[PACKET_swbreak_feature],
                          "swbreak-feature", "swbreak-feature", 0);
 
@@ -13260,7 +13264,6 @@ Show the maximum size of the address (in bits) in a memory packet."), NULL,
 	switch (i)
 	  {
 	  case PACKET_QNonStop:
-	  case PACKET_multiprocess_feature:
 	  case PACKET_EnableDisableTracepoints_feature:
 	  case PACKET_tracenz_feature:
 	  case PACKET_DisconnectedTracing_feature:
-- 
1.9.3