ld-checks: tweak overflow checks.

* testsuite/ld-checks/checks.exp (overflow_check): Disable for
	non-elf targets.

ld/ChangeLog

@@ -1,3 +1,8 @@
+2017-03-15  Tristan Gingold  <gingold@adacore.com>
+
+	* testsuite/ld-checks/checks.exp (overflow_check): Disable for
+	non-elf targets.
+
 2017-03-14  H.J. Lu  <hongjiu.lu@intel.com>
 
 	* ldlang.c (lang_check_section_addresses): Use addr_mask to

ld/testsuite/ld-checks/checks.exp

@@ -85,6 +85,9 @@ proc overflow_check {} {
 	 && ![istarget arm*-*-*] } {
 	return
     }
+    if ![is_elf_format] {
+	return
+    }
 
     run_dump_test "over"
     run_dump_test "over2"