Avoid rare crashes due to clobbering of input events

* src/keyboard.c (read_char): Declare C 'volatile', to prevent
clobbering it by setjmp/longjmp.  Do not merge to master.
(Bug#71744)

diff --git a/src/keyboard.c b/src/keyboard.c
index c75e80d2a05c4c9d95840d33e80fb10952890b59..e7b0af9f63c30d640f4daa0709f36f0be39a6acf 100644 (file)
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -2522,7 +2522,7 @@ read_char (int commandflag, Lisp_Object map,
           Lisp_Object prev_event,
           bool *used_mouse_menu, struct timespec *end_time)
 {
-  Lisp_Object c;
+  volatile Lisp_Object c;
   sys_jmp_buf local_getcjmp;
   sys_jmp_buf save_jump;
   Lisp_Object tem, save;