Add clang volatile fixes from FreeBSD and NetBSD.

Use volatile instead of optnone to avoid optimization which causes
segmentation faults.
Patch by Dimitry Andric.  [ruby-core:78531] [Bug #13014]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57020 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 2 deletions

diff --git a/eval.c b/eval.c
index 6b4acf575d..178ff62137 100644
--- a/eval.c
+++ b/eval.c
@@ -813,7 +813,7 @@ rb_rescue2(VALUE (* b_proc) (ANYARGS), VALUE data1,
 {
     int state;
     rb_thread_t *th = GET_THREAD();
-    rb_control_frame_t *cfp = th->cfp;
+    rb_control_frame_t *volatile cfp = th->cfp;
     volatile VALUE result = Qfalse;
     volatile VALUE e_info = th->errinfo;
     va_list args;
@@ -879,7 +879,7 @@ rb_protect(VALUE (* proc) (VALUE), VALUE data, int * state)
     volatile VALUE result = Qnil;
     volatile int status;
     rb_thread_t *th = GET_THREAD();
-    rb_control_frame_t *cfp = th->cfp;
+    rb_control_frame_t *volatile cfp = th->cfp;
     struct rb_vm_protect_tag protect_tag;
     rb_jmpbuf_t org_jmpbuf;