[PATCH 2/3] Don't rely on deduction in run-on-main-thread.c

[Tom Tromey <tromey@adacore.com>]

This changes one spot in run-on-main-thread.c to use an explicit
template argument, rather than relying on deduction.  The deduction
would otherwise fail with the next patch.
---
 gdb/run-on-main-thread.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gdb/run-on-main-thread.c b/gdb/run-on-main-thread.c
index bf53163b6b717bc7101619da15ce45810952284d..0cfe4716c24739f4de3daacff555e546ea2e5925 100644
--- a/gdb/run-on-main-thread.c
+++ b/gdb/run-on-main-thread.c
@@ -151,7 +151,7 @@ INIT_GDB_FILE (run_on_main_thread)
   add_final_cleanup ([] ()
     {
 #if CXX_STD_THREAD
-      std::lock_guard lock (runnable_mutex);
+      std::lock_guard<std::mutex> lock (runnable_mutex);
 #endif
       runnables.clear ();
     });

-- 
2.51.0