Fix 'arg parameter might be clobbered by setjmp' compiler warning

* mach_dep.c (GC_with_callee_saves_pushed): Make "arg" parameter
volatile (to prevent it from potential clobbering).

1 files changed, 1 insertions, 1 deletions

diff --git a/mach_dep.c b/mach_dep.c
index 29e0b8a7..0515a531 100644
--- a/mach_dep.c
+++ b/mach_dep.c
@@ -218,7 +218,7 @@
 /* are somewhere on the stack, and then call fn(arg, ctxt).             */
 /* ctxt is either a pointer to a ucontext_t we generated, or NULL.      */
 GC_INNER void GC_with_callee_saves_pushed(void (*fn)(ptr_t, void *),
-                                          ptr_t arg)
+                                          volatile ptr_t arg)
 {
     volatile int dummy;
     void * context = 0;