Fix PR mi/20431 - Missing MI prompts after sync execution MI command (-exec-continue, etc.) errors

gdb 7.11 introduced an MI regression: a failing MI sync execution
command misses printing the MI prompt, and then all subsequent command
miss it too:

 $ gdb-7.11.1 -i=mi
 [...]
 p 1
 &"p 1\n"
 ~"$1 = 1"
 ~"\n"
 ^done
 (gdb)                                        <<< prompted ok
 -exec-continue
 ^error,msg="The program is not being run."   <<< missing prompt after this
 print 1
 &"print 1\n"
 ~"$2 = 1"
 ~"\n"
 ^done                                        <<< missing prompt after this


gdb 7.10.1 behaved correctly, even with "set mi-async on":

 -exec-continue
 ^error,msg="The program is not being run."
 (gdb)                                        <<< prompted ok

etc.

Bisecting points at:

  commit 0b333c5e7d6c
  Author: Pedro Alves <palves@redhat.com>
  Date:   Wed Sep 9 18:23:23 2015 +0100

      Merge async and sync code paths some more
  [...]

The problem is that when an exception is thrown, we leave the prompt
state set to PROMPT_BLOCKED, and then mi_execute_command_input_handler
doesn't print the prompt.  It used to work because before that patch,
we happened to skip disabling stdin if the current target didn't do
async (which it never does before execution).

I was surprised to find that this bug isn't caught by the testsuite,
so I made a thorough test that tests all combinations of pairs of:

 - a failing synchronous execution command
 - a failing non-execution command
 - a non-failing command

gdb/ChangeLog:
2016-08-09  Pedro Alves  <palves@redhat.com>

	PR mi/20431
	* mi/mi-main.c (mi_execute_command): Enable input and set prompt
	state to PROMPT_NEEDED.

gdb/testsuite/ChangeLog:
2016-08-09  Pedro Alves  <palves@redhat.com>

	PR mi/20431
	* gdb.mi/mi-cmd-error.exp: New file.

1 files changed, 7 insertions, 0 deletions

diff --git a/gdb/mi/mi-main.c b/gdb/mi/mi-main.c
index b1cbd8b..1913157 100644
--- a/gdb/mi/mi-main.c
+++ b/gdb/mi/mi-main.c
@@ -2139,6 +2139,13 @@ mi_execute_command (const char *cmd, int from_tty)
 	}
       CATCH (result, RETURN_MASK_ALL)
 	{
+	  /* Like in start_event_loop, enable input and force display
+	     of the prompt.  Otherwise, any command that calls
+	     async_disable_stdin, and then throws, will leave input
+	     disabled.  */
+	  async_enable_stdin ();
+	  current_ui->prompt_state = PROMPT_NEEDED;
+
 	  /* The command execution failed and error() was called
 	     somewhere.  */
 	  mi_print_exception (command->token, result);