target-supports.exp (check_effective_target_shared): New function.

2014-10-11  Christophe Lyon  <christophe.lyon@linaro.org>

	gcc/testsuite/
	* lib/target-supports.exp (check_effective_target_shared): New
	function.
        * g++.dg/ipa/devirt-28a.C: Check if -shared is supported.

From-SVN: r216117

gcc/testsuite/ChangeLog

+2014-10-11  Christophe Lyon  <christophe.lyon@linaro.org>
+
+	* lib/target-supports.exp (check_effective_target_shared): New
+	function.
+        * g++.dg/ipa/devirt-28a.C: Check if -shared is supported.
+
 2014-10-10  Jakub Jelinek  <jakub@redhat.com>
 
 	PR c/63495

gcc/testsuite/g++.dg/ipa/devirt-28a.C

 // PR c++/58678
 // { dg-options "-O3 -flto -shared -fPIC -Wl,--no-undefined" }
-// { dg-do link { target { gld && fpic } } }
+// { dg-do link { target { { gld && fpic } && shared } } }
 
 struct A {
   virtual ~A();

gcc/testsuite/lib/target-supports.exp

@@ -840,6 +840,19 @@ proc check_effective_target_fpic { } {
     return 0
 }
 
+# Return 1 if -shared is supported, as in no warnings or errors
+# emitted, 0 otherwise.
+
+proc check_effective_target_shared { } {
+    # Note that M68K has a multilib that supports -fpic but not
+    # -fPIC, so we need to check both.  We test with a program that
+    # requires GOT references.
+    return [check_no_compiler_messages shared executable {
+	extern int foo (void); extern int bar;
+	int baz (void) { return foo () + bar; }
+    } "-shared -fpic"]
+}
+
 # Return 1 if -pie, -fpie and -fPIE are supported, 0 otherwise.
 
 proc check_effective_target_pie { } {