objc: update documetation and add test-case of

	* doc/extend.texi: Remove limitation of Objective C for
	__attribute__((constructor)) and __attribute__((destructor)).
	* objc/execute/construct1.m: New test.

From-SVN: r240618

gcc/ChangeLog

+2016-09-29  Martin Liska  <mliska@suse.cz>
+
+	* doc/extend.texi: Remove limitation of Objective C for
+	__attribute__((constructor)) and __attribute__((destructor)).
+
 2016-09-29  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/77768

gcc/doc/extend.texi

@@ -2508,8 +2508,6 @@ same priority.  The priorities for constructor and destructor
 functions are the same as those specified for namespace-scope C++
 objects (@pxref{C++ Attributes}).
 
-These attributes are not currently implemented for Objective-C@.
-
 @item deprecated
 @itemx deprecated (@var{msg})
 @cindex @code{deprecated} function attribute

gcc/testsuite/ChangeLog

+2016-09-29  Martin Liska  <mliska@suse.cz>
+
+	* objc/execute/construct1.m: New test.
+
 2016-09-29  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/77768

gcc/testsuite/objc/execute/construct1.m

+int i;
+
+void hello (void) __attribute__ ((constructor));
+void hello (void) { i = 1; }
+
+int main (void) {
+  if (i != 1)
+    return 1;
+
+  return 0;
+}