[PATCH 01/24] gdb_test_multiple match eof of any spawn_id

[Pedro Alves <palves@redhat.com>]

Since silent handling of eof is usually the wrong thing to do, this
patch makes gdb_test_multiple handle it for all $any_spawn_id.

Currently, against gdbserver, interrupt.exp occasionaly fails like
this:

 FAIL: gdb.base/interrupt.exp: send end of file

gdb.log with expect debug output enabled shows:

 expect: does "\r\n\r\nChild exited with status 0\r\nGDBserver exiting\r\n" (spawn_id exp8) match regular expression "end of file"? Gate "end of file"? gate=no
 expect: read eof
 expect: set expect_out(spawn_id) "exp8"
 expect: set expect_out(buffer) "\r\n\r\nChild exited with status 0\r\nGDBserver exiting\r\n"
 FAIL: gdb.base/interrupt.exp: send end of file

Note "expect: read eof" for spawn_id=exp8.  exp8 is
inferior_spawn_id/gdbserver_spawn_id.  That means
expect/gdb_test_multiple saw gdbserver exit before we got the expected
gdb output.  Since there's no explicit pattern for "eof", expect (and
thus gdb_test_multiple) just returns.

After this commit, we get instead:

 ERROR: Process no longer exists
 UNRESOLVED: gdb.base/interrupt.exp: send end of file

Note that before we still got an FAIL because $saw_inferior_exit is 0
when we get to:

	gdb_assert { $saw_eof && $saw_inferior_exit } $msg

Fixing the fail (now unresolved) will be the subject of a separate
patch.

gdb/testsuite/ChangeLog:
2015-04-21  Pedro Alves  <palves@redhat.com>

	* lib/gdb.exp (gdb_test_multiple): Match eof/full_buffer/timeout
	on $any_spawn_id instead of only on $gdb_spawn_id.
---
 gdb/testsuite/lib/gdb.exp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 7d8720b..73e55e3 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -692,6 +692,7 @@ proc gdb_test_multiple { command message user_code } {
     global inferior_exited_re
     upvar timeout timeout
     upvar expect_out expect_out
+    global any_spawn_id
 
     if { $message == "" } {
 	set message $command
@@ -918,6 +919,9 @@ proc gdb_test_multiple { command message user_code } {
 	    fail "$message (got breakpoint menu)"
 	    set result -1
 	}
+
+	# Patterns below apply to any spawn id specified.
+	-i $any_spawn_id
 	eof {
 	    perror "Process no longer exists"
 	    if { $message != "" } {
-- 
1.9.3