merge revision(s) 56561: [Backport #12893]

	* cont.c (cont_new): disable optimization if clang's version is
	  3.8.0.  [ruby-core:77894] [Bug #12893]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@56717 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/cont.c b/cont.c
index 729a025fb0..10b1cc602c 100644
--- a/cont.c
+++ b/cont.c
@@ -476,6 +476,10 @@ cont_new(VALUE klass)
 
 static VALUE
 cont_capture(volatile int *stat)
+#if defined(__clang__) && \
+    __clang_major__ == 3 && __clang_minor__ == 8 && __clang_patch__ == 0
+__attribute__ ((optnone))
+#endif
 {
     rb_context_t *cont;
     rb_thread_t *th = GET_THREAD();