* 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/trunk@56561 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 9 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index bb953330a0..2300af62e8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Nov  5 11:20:57 2016  Shugo Maeda  <shugo@ruby-lang.org>
+
+	* cont.c (cont_new): disable optimization if clang's version is
+	  3.8.0.  [ruby-core:77894] [Bug #12893]
+
 Sat Nov  5 10:07:18 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* test/ruby/test_file.rb (TestFile#test_stat): fix noatime case.
diff --git a/cont.c b/cont.c
index 8119b5cb23..85d376653e 100644
--- a/cont.c
+++ b/cont.c
@@ -471,6 +471,10 @@ 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();