[FYI/pushed v4 07/25] Thread options & clone events (native Linux)

[Pedro Alves <pedro@palves.net>]

This commit teaches the native Linux target about the
GDB_THREAD_OPTION_CLONE thread option.  It's actually simpler to just
continue reporting all clone events unconditionally to the core.
There's never any harm in reporting a clone event when the option is
disabled.  All we need to do is to report support for the option,
otherwise GDB falls back to use target_thread_events().

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=19675
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=27830
Reviewed-By: Andrew Burgess <aburgess@redhat.com>
Change-Id: If90316e2dcd0c61d0fefa0d463c046011698acf9
---
 gdb/linux-nat.c | 7 +++++++
 gdb/linux-nat.h | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index da870e84922..5bbdabc241a 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -4503,6 +4503,13 @@ linux_nat_target::thread_events (int enable)
   report_thread_events = enable;
 }
 
+bool
+linux_nat_target::supports_set_thread_options (gdb_thread_options options)
+{
+  constexpr gdb_thread_options supported_options = GDB_THREAD_OPTION_CLONE;
+  return ((options & supported_options) == options);
+}
+
 linux_nat_target::linux_nat_target ()
 {
   /* We don't change the stratum; this target will sit at
diff --git a/gdb/linux-nat.h b/gdb/linux-nat.h
index 1cdbeafd4f3..cf236160b4a 100644
--- a/gdb/linux-nat.h
+++ b/gdb/linux-nat.h
@@ -82,6 +82,8 @@ class linux_nat_target : public inf_ptrace_target
 
   void thread_events (int) override;
 
+  bool supports_set_thread_options (gdb_thread_options options) override;
+
   bool can_async_p () override;
 
   bool supports_non_stop () override;
-- 
2.34.1