asan.c (instrument_derefs): Disable instrumentation on asan-globals=0.

2015-03-11  Marat Zakirov  <m.zakirov@samsung.com>

	* asan.c (instrument_derefs): Disable instrumentation on asan-globals=0.
	* c-c++-common/asan/no-asan-check-glob.c: New test.

From-SVN: r221345

gcc/ChangeLog

+2015-03-11  Marat Zakirov  <m.zakirov@samsung.com>
+
+	* asan.c (instrument_derefs): Disable instrumentation on asan-globals=0.
+
 2015-03-10  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/65368

gcc/asan.c

@@ -1820,6 +1820,8 @@ instrument_derefs (gimple_stmt_iterator *iter, tree t,
     {
       if (DECL_THREAD_LOCAL_P (inner))
 	return;
+      if (!ASAN_GLOBALS && is_global_var (inner))
+        return;
       if (!TREE_STATIC (inner))
 	{
 	  /* Automatic vars in the current function will be always

gcc/testsuite/ChangeLog

+2015-03-11  Marat Zakirov  <m.zakirov@samsung.com>
+
+	* c-c++-common/asan/no-asan-check-glob.c: New test.
+
 2015-03-10  Paolo Carlini  <paolo.carlini@oracle.com>
 
 	PR c++/65370

gcc/testsuite/c-c++-common/asan/no-asan-check-glob.c

+/* { dg-options "--param asan-globals=0 -fdump-tree-asan" } */
+/* { dg-do compile } */
+/* { dg-skip-if "" { *-*-* } { "-O0" } { "*" } } */
+
+extern int a;
+
+int foo ()
+{
+  return a;
+}
+
+/* { dg-final { scan-tree-dump-times "ASAN_CHECK" 0 "asan1" } } */
+/* { dg-final { cleanup-tree-dump "asan1" } } */