Disable callcc when ASAN is enabled

callcc's implementation is fundamentally incompatible with ASAN. Since
callcc is deprecated and almost never used, it's probably OK to disable
callcc when ruby is compiled with ASAN.

[Bug #20273]

1 files changed, 7 insertions, 0 deletions

diff --git a/cont.c b/cont.c
index cccca9d884..5a805cc1ac 100644
--- a/cont.c
+++ b/cont.c
@@ -1775,6 +1775,13 @@ rb_callcc(VALUE self)
         return rb_yield(val);
     }
 }
+#ifdef RUBY_ASAN_ENABLED
+/* callcc can't possibly work with ASAN; see bug #20273. Also this function
+ * definition below avoids a "defined and not used" warning. */
+MAYBE_UNUSED(static void notusing_callcc(void)) { rb_callcc(Qnil); }
+# define rb_callcc rb_f_notimplement
+#endif
+
 
 static VALUE
 make_passing_arg(int argc, const VALUE *argv)