[PATCH v2 08/29] Thread options & clone events (native Linux)

[Pedro Alves <pedro@palves.net>]

This commit teaches the native Linux target about the GDB_TO_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 report support for the option, otherwise GDB falls back to use
target_thread_events().

Change-Id: If271f20320d864f074d8ac0d531cc1a323da847f
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=19675
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=27830
---
 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 23d42b5fd55..4ddc54ff8bc 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -4416,6 +4416,13 @@ 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_TO_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 683173dbd38..c449dc77a5e 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;
-- 
2.36.0