gdb: add inferior_execd observable

I want to add another action (clearing displaced stepping state) that
happens when an inferior execs.  I think it would be cleaner to have an
observer for this event, rather than have infrun know about each other
sub-component.

Replace the calls to solib_create_inferior_hook and
jit_inferior_created_hook in follow_exec by observers.

gdb/ChangeLog:

	* observable.h (inferior_execd): Declare new observable.
	* observable.c (inferior_execd): Declare new observable.
	* infrun.c (follow_exec): Notify inferior_execd observer.
	* jit.c (jit_inferior_created_hook): Make static.
	(_initialize_jit): Register inferior_execd observer.
	* jit.h (jit_inferior_created_hook): Remove declaration.
	* solib.c (_initialize_solib): Register inferior_execd observer.

Change-Id: I000cce00094e23baa67df693d912646b6ae38e44

1 files changed, 4 insertions, 0 deletions

diff --git a/gdb/solib.c b/gdb/solib.c
index b11c6f3..1f6e915 100644
--- a/gdb/solib.c
+++ b/gdb/solib.c
@@ -1557,6 +1557,10 @@ _initialize_solib ()
   solib_data = gdbarch_data_register_pre_init (solib_init);
 
   gdb::observers::free_objfile.attach (remove_user_added_objfile);
+  gdb::observers::inferior_execd.attach ([] (inferior *inf)
+    {
+      solib_create_inferior_hook (0);
+    });
 
   add_com ("sharedlibrary", class_files, sharedlibrary_command,
 	   _("Load shared object library symbols for files matching REGEXP."));