Exit code of exited inferiors in -list-thread-groups

Don't reset the exit code at inferior exit and print it in
-list-thread-groups.

gdb/ChangeLog:

	* NEWS: Announce new exit-code field in -list-thread-groups
	output.
	* inferior.c (exit_inferior_1): Don't clear exit code.
	(inferior_appeared): Clear exit code.
	* mi/mi-main.c (print_one_inferior): Add printing of the exit
	code.

gdb/testsuite/ChangeLog:

	* gdb.mi/mi-exit-code.exp: New file.
	* gdb.mi/mi-exit-code.c: New file.

gdb/doc/ChangeLog:

	* gdb.texinfo (Miscellaneous gdb/mi Commands): Document new
	exit-code field in -list-thread-groups output.

1 files changed, 2 insertions, 2 deletions

diff --git a/gdb/inferior.c b/gdb/inferior.c
index 23da0c7fe4d..66401ab99bd 100644
--- a/gdb/inferior.c
+++ b/gdb/inferior.c
@@ -275,8 +275,6 @@ exit_inferior_1 (struct inferior *inftoex, int silent)
       inf->vfork_child = NULL;
     }
 
-  inf->has_exit_code = 0;
-  inf->exit_code = 0;
   inf->pending_detach = 0;
 }
 
@@ -322,6 +320,8 @@ void
 inferior_appeared (struct inferior *inf, int pid)
 {
   inf->pid = pid;
+  inf->has_exit_code = 0;
+  inf->exit_code = 0;
 
   observer_notify_inferior_appeared (inf);
 }