tsan-dg.exp (tsan_init): Try to run a trivial program, if it fails don't run any tsan tests.

	* lib/tsan-dg.exp (tsan_init): Try to run a trivial program,
	if it fails don't run any tsan tests.

From-SVN: r207337

gcc/testsuite/ChangeLog

+2014-01-31  Jakub Jelinek  <jakub@redhat.com>
+
+	* lib/tsan-dg.exp (tsan_init): Try to run a trivial program,
+	if it fails don't run any tsan tests.
+
 2014-01-31  Marek Polacek  <polacek@redhat.com>
 
 	PR c/59963

gcc/testsuite/lib/tsan-dg.exp

@@ -93,7 +93,11 @@ proc tsan_init { args } {
 	}
     }
     if { $link_flags != "" } {
-	return 1
+	if [check_runtime_nocache tsan_works {
+		int main () { return 0; }
+	    } "-fPIE -pie -fsanitize=thread -g"] {
+	    return 1
+	}
     }
     return 0
 }