Add rdynamic-1 test

It is added for

commit 409ff343a4
Author: Alan Modra <amodra@gmail.com>
Date:   Tue Nov 8 13:49:11 2011 +0000

      * elflink.c (bfd_elf_gc_mark_dynamic_ref_symbol): Mark syms in
      executables when export_dynamic.

	* ld-elf/rdynamic-1.c: New file.
	* ld-elf/rdynamic-1.rd: Likewise.

	* ld-elf/shared.exp (build_tests): Add rdynamic-1.

ld/testsuite/ChangeLog

@@ -1,3 +1,10 @@
+2014-01-29  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* ld-elf/rdynamic-1.c: New file.
+	* ld-elf/rdynamic-1.rd: Likewise.
+
+	* ld-elf/shared.exp (build_tests): Add rdynamic-1.
+
 2014-01-28  Nick Clifton  <nickc@redhat.com>
 
 	PR binutils/16317

ld/testsuite/ld-elf/rdynamic-1.c

@@ -0,0 +1,10 @@
+void
+rdynamic ()
+{
+}
+
+int
+main ()
+{
+  return 0;
+}

ld/testsuite/ld-elf/rdynamic-1.rd

@@ -0,0 +1,5 @@
+Symbol table '\.dynsym' contains [0-9]+ entries:
+ +Num: +Value +Size Type +Bind +Vis +Ndx Name
+#...
+ +[0-9]+: +[0-9a-f]+ +[0-9a-f]+ +FUNC +GLOBAL +DEFAULT +[0-9]+ +_?rdynamic
+#...

ld/testsuite/ld-elf/shared.exp

@@ -224,6 +224,9 @@ set build_tests {
   {"Build libpr2404b.a"
    "" ""
    {pr2404b.c} {} "libpr2404b.a"}
+  {"Build rdynamic-1"
+   "-rdynamic -Wl,--gc-sections" "-ffunction-sections"
+   {rdynamic-1.c} {{readelf {-s} rdynamic-1.rd}} "rdynamic-1"}
 }
 
 run_cc_link_tests $build_tests