gdb: For macOS, s/thread_info/struct thread_info/

The macOS build currently fails with several instances of this problem:

  In file included from ../../src/gdb/darwin-nat.h:22:0,
		   from ../../src/gdb/i386-darwin-nat.c:37:
  ../../src/gdb/gdbthread.h:376:59: error: type/value mismatch at argument 1 in template parameter list for 'template<class T, class Policy> class gdb::ref_ptr'
     = gdb::ref_ptr<thread_info, refcounted_object_ref_policy>;
							     ^
  ../../src/gdb/gdbthread.h:376:59: note:   expected a type, got 'thread_info'
  ../../src/gdb/gdbthread.h:396:28: error: variable or field 'delete_thread' declared void
   extern void delete_thread (thread_info *thread);
			      ^
(...)

This is because there's a thread_info function in the Darwin/XNU/mach API:

 http://web.mit.edu/darwin/src/modules/xnu/osfmk/man/thread_info.html

Fix this in the same way it had been fixed in commit 7aabaf9d4ad5
("Create private_thread_info hierarchy"), by adding an explicit
"struct" keyword.

gdb/ChangeLog:
2018-06-25  Pedro Alves  <palves@redhat.com>

	* gdbthread.h (thread_info_ref, delete_thread)
	(delete_thread_silent, first_thread_of_inferior)
	(any_thread_of_inferior, switch_to_thread)
	(enable_thread_stack_temporaries)
	(thread_stack_temporaries_enabled_p, push_thread_stack_temporary)
	(get_last_thread_stack_temporary)
	(value_in_thread_stack_temporaries, can_access_registers_thread):
	Spell out "struct thread_info" instead of just "thread_info".
	* inferior.h (notice_new_inferior): Likewise.

3 files changed, 27 insertions, 15 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 4a3f718..be8383e 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,17 @@
 2018-06-25  Pedro Alves  <palves@redhat.com>
 
+	* gdbthread.h (thread_info_ref, delete_thread)
+	(delete_thread_silent, first_thread_of_inferior)
+	(any_thread_of_inferior, switch_to_thread)
+	(enable_thread_stack_temporaries)
+	(thread_stack_temporaries_enabled_p, push_thread_stack_temporary)
+	(get_last_thread_stack_temporary)
+	(value_in_thread_stack_temporaries, can_access_registers_thread):
+	Spell out "struct thread_info" instead of just "thread_info".
+	* inferior.h (notice_new_inferior): Likewise.
+
+2018-06-25  Pedro Alves  <palves@redhat.com>
+
 	* windows-nat.c (windows_delete_thread): Use find_thread_ptid and
 	pass thread_info pointer to delete_thread.
 	(windows_nat_target::detach): Pass inferior pointer to
diff --git a/gdb/gdbthread.h b/gdb/gdbthread.h
index bd5ab91..ec607bb 100644
--- a/gdb/gdbthread.h
+++ b/gdb/gdbthread.h
@@ -373,7 +373,7 @@ public:
 /* A gdb::ref_ptr pointer to a thread_info.  */
 
 using thread_info_ref
-  = gdb::ref_ptr<thread_info, refcounted_object_ref_policy>;
+  = gdb::ref_ptr<struct thread_info, refcounted_object_ref_policy>;
 
 /* Create an empty thread list, or empty the existing one.  */
 extern void init_thread_list (void);
@@ -393,12 +393,12 @@ extern struct thread_info *add_thread_with_info (ptid_t ptid,
 						 struct private_thread_info *);
 
 /* Delete an existing thread list entry.  */
-extern void delete_thread (thread_info *thread);
+extern void delete_thread (struct thread_info *thread);
 
 /* Delete an existing thread list entry, and be quiet about it.  Used
    after the process this thread having belonged to having already
    exited, for example.  */
-extern void delete_thread_silent (thread_info *thread);
+extern void delete_thread_silent (struct thread_info *thread);
 
 /* Delete a step_resume_breakpoint from the thread database.  */
 extern void delete_step_resume_breakpoint (struct thread_info *);
@@ -448,15 +448,15 @@ struct thread_info *find_thread_by_handle (struct value *thread_handle,
 					   struct inferior *inf);
 
 /* Finds the first thread of the specified inferior.  */
-extern thread_info *first_thread_of_inferior (inferior *inf);
+extern struct thread_info *first_thread_of_inferior (inferior *inf);
 
 /* Returns any thread of inferior INF, giving preference to the
    current thread.  */
-extern thread_info *any_thread_of_inferior (inferior *inf);
+extern struct thread_info *any_thread_of_inferior (inferior *inf);
 
 /* Returns any non-exited thread of inferior INF, giving preference to
    the current thread, and to not executing threads.  */
-extern thread_info *any_live_thread_of_inferior (inferior *inf);
+extern struct thread_info *any_live_thread_of_inferior (inferior *inf);
 
 /* Change the ptid of thread OLD_PTID to NEW_PTID.  */
 void thread_change_ptid (ptid_t old_ptid, ptid_t new_ptid);
@@ -493,7 +493,7 @@ extern struct thread_info *iterate_over_threads (thread_callback_func, void *);
 extern int thread_count (void);
 
 /* Switch context to thread THR.  Also sets the STOP_PC global.  */
-extern void switch_to_thread (thread_info *thr);
+extern void switch_to_thread (struct thread_info *thr);
 
 /* Switch context to no thread selected.  */
 extern void switch_to_no_thread ();
@@ -660,7 +660,7 @@ class enable_thread_stack_temporaries
 {
 public:
 
-  explicit enable_thread_stack_temporaries (thread_info *thr)
+  explicit enable_thread_stack_temporaries (struct thread_info *thr)
     : m_thr (thr)
   {
     gdb_assert (m_thr != NULL);
@@ -683,17 +683,17 @@ public:
 
 private:
 
-  thread_info *m_thr;
+  struct thread_info *m_thr;
 };
 
-extern bool thread_stack_temporaries_enabled_p (thread_info *tp);
+extern bool thread_stack_temporaries_enabled_p (struct thread_info *tp);
 
-extern void push_thread_stack_temporary (thread_info *tp, struct value *v);
+extern void push_thread_stack_temporary (struct thread_info *tp, struct value *v);
 
-extern value *get_last_thread_stack_temporary (thread_info *tp);
+extern value *get_last_thread_stack_temporary (struct thread_info *tp);
 
 extern bool value_in_thread_stack_temporaries (struct value *,
-					       thread_info *thr);
+					       struct thread_info *thr);
 
 /* Add TP to the end of its inferior's pending step-over chain.  */
 
@@ -723,7 +723,7 @@ extern void validate_registers_access (void);
 
 /* Check whether it makes sense to access a register of THREAD at this point.
    Returns true if registers may be accessed; false otherwise.  */
-extern bool can_access_registers_thread (thread_info *thread);
+extern bool can_access_registers_thread (struct thread_info *thread);
 
 /* Returns whether to show which thread hit the breakpoint, received a
    signal, etc. and ended up causing a user-visible stop.  This is
diff --git a/gdb/inferior.h b/gdb/inferior.h
index 3f4d7a5..bfad91d 100644
--- a/gdb/inferior.h
+++ b/gdb/inferior.h
@@ -177,7 +177,7 @@ extern void delete_longjmp_breakpoint_cleanup (void *arg);
 
 extern void detach_command (const char *, int);
 
-extern void notice_new_inferior (thread_info *, int, int);
+extern void notice_new_inferior (struct thread_info *, int, int);
 
 extern struct value *get_return_value (struct value *function,
 				       struct type *value_type);