PR22374 testcase, function pointer references in .data

Function pointer references in .data ought to use a dynamic reloc.
There shouldn't be any need for a PLT entry and definitely no copy
reloc.

This test fails on quite a few targets, but isn't something that
anyone should worry about too much.  It's really just a missed
optimization.

	PR 22374
	* testsuite/ld-elf/pr22374a.s,
	* testsuite/ld-elf/pr22374b.s,
	* testsuite/ld-elf/pr22374-1.r,
	* testsuite/ld-elf/pr22374-2.r: New test.
	* testsuite/ld-elf/elf.exp: Run it.

ld/ChangeLog

@@ -1,3 +1,12 @@
+2017-11-01  Alan Modra  <amodra@gmail.com>
+
+	PR 22374
+	* testsuite/ld-elf/pr22374a.s,
+	* testsuite/ld-elf/pr22374b.s,
+	* testsuite/ld-elf/pr22374-1.r,
+	* testsuite/ld-elf/pr22374-2.r: New test.
+	* testsuite/ld-elf/elf.exp: Run it.
+
 2017-11-01  Alan Modra  <amodra@gmail.com>
 
 	* testsuite/ld-elf/elf.exp: Merge some conditionals, a better

ld/testsuite/ld-elf/elf.exp

@@ -192,6 +192,17 @@ if { [check_shared_lib_support] } then {
 	    "pr20995-2" \
 	    "" "tmpdir/pr20995-2.so" "$AFLAGS_NONPIC" \
 	    {pr20995a.s} {{readelf {-S --wide} pr20995.r}} "pr20995-2"]]
+
+    setup_xfail "tic6x-*-*"
+    run_ld_link_tests {
+	{"Build pr22374 shared library"
+	    "-shared" "" "" "pr22374b.s" {} "pr22374.so" }
+	{"pr22374 function pointer initialization"
+	    "" "tmpdir/pr22374.so" "" "pr22374a.s"
+	    { {readelf {--wide -r --dyn-syms} "pr22374-1.r"}
+	      {readelf {--wide -r} "pr22374-2.r"} }
+	    "pr22374" }
+    }
 }
 
 if [is_underscore_target] {

ld/testsuite/ld-elf/pr22374-1.r

@@ -0,0 +1,8 @@
+Relocation section .* contains 1 entries:
+.*
+.* +0+ +foo.*
+
+Symbol table '.dynsym' contains .* entries:
+#...
+.*: 0+ +0 FUNC +GLOBAL DEFAULT +UND foo
+#pass

ld/testsuite/ld-elf/pr22374-2.r

@@ -0,0 +1,4 @@
+#failif
+Relocation section .* contains 1 entries:
+.*
+.*COPY.*

ld/testsuite/ld-elf/pr22374a.s

@@ -0,0 +1,2 @@
+ .data
+ .dc.a foo

ld/testsuite/ld-elf/pr22374b.s

@@ -0,0 +1,5 @@
+ .global foo
+ .type foo, %function
+foo:
+ .dc.a 0
+ .size foo, .-foo