Fix =thread-exited not showing up when detaching (PR 15564)

I sent a patch in 2013 for this (incorrectly named =thread-created):

  https://cygwin.com/ml/gdb-patches/2013-06/msg00129.html

Tom Tromey was ok with the change, but suggested to add a test as well.
Then I forgot about this patch until today. So here it is again, with the
corresponding test.

The problem is that the =thread-exited event does not appear when detaching
from a local process. It does appear with remote though. It's not a really
big deal, but I'd like it to be consistent.

Tested with local and remote Linux on my Ubuntu 14.04.

gdb/ChangeLog:

	PR gdb/15564
	* inferior.c (detach_inferior): Call exit_inferior_1 with silent = 0.

gdb/testsuite/ChangeLog:

	PR gdb/15564
	* gdb.mi/mi-detach.exp: New file.

1 files changed, 35 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.mi/mi-detach.exp b/gdb/testsuite/gdb.mi/mi-detach.exp
new file mode 100644
index 00000000000..88759a965de
--- /dev/null
+++ b/gdb/testsuite/gdb.mi/mi-detach.exp
@@ -0,0 +1,35 @@
+# Copyright 2015 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/>.
+
+# Test that detaching from the inferior produces the right MI records.
+
+load_lib mi-support.exp
+set MIFLAGS "-i=mi"
+
+gdb_exit
+if [mi_gdb_start] {
+    continue
+}
+
+standard_testfile basics.c
+
+if {[build_executable $testfile.exp $testfile $srcfile {debug}] == -1} {
+     untested mi-detach.exp
+     return -1
+}
+
+mi_run_to_main
+
+mi_gdb_test "-target-detach" "=thread-exited,id=\"1\".*=thread-group-exited,id=\"i1\".*" "detach"