Add another test for PR ld/18841

PR ld/18841
	* ld-ifunc/ifunc.exp: Add another test for PR ld/18841.
	* ld-ifunc/pr18841c.c: New file.

ld/testsuite/ChangeLog

@@ -1,3 +1,9 @@
+2015-08-18  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/18841
+	* ld-ifunc/ifunc.exp: Add another test for PR ld/18841.
+	* ld-ifunc/pr18841c.c: New file.
+
 2015-08-18  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR ld/18841

ld/testsuite/ld-ifunc/ifunc.exp

@@ -473,12 +473,20 @@ run_cc_link_tests [list \
 	"libpr18808.so" \
     ] \
     [list \
-	"Build libpr18841.so" \
+	"Build libpr18841b.so" \
 	"-shared" \
 	"-fPIC -O0 -g" \
 	{ pr18841b.c } \
 	{} \
-	"libpr18841.so" \
+	"libpr18841b.so" \
+    ] \
+    [list \
+	"Build libpr18841c.so" \
+	"-shared" \
+	"-fPIC -O0 -g" \
+	{ pr18841c.c } \
+	{} \
+	"libpr18841c.so" \
     ] \
 ]
 
@@ -492,11 +500,19 @@ run_ld_link_exec_tests [] [list \
 	"pr18808.out" \
     ] \
     [list \
-	"Run pr18841" \
-	"tmpdir/libpr18841.so" \
+	"Run pr18841 with libpr18841b.so" \
+	"tmpdir/libpr18841b.so" \
 	"" \
 	{ pr18841a.c } \
-	"pr18841" \
+	"pr18841b" \
+	"pr18841.out" \
+    ] \
+    [list \
+	"Run pr18841 with libpr18841c.so" \
+	"tmpdir/libpr18841c.so" \
+	"" \
+	{ pr18841a.c } \
+	"pr18841c" \
 	"pr18841.out" \
     ] \
 ]

ld/testsuite/ld-ifunc/pr18841c.c

@@ -0,0 +1,17 @@
+void foo() __attribute__((ifunc("resolve_foo")));
+
+static void foo_impl() {}
+extern void zoo(void);
+void (*pz)(void) = zoo;
+
+void test()
+{
+  void (*pg)(void) = foo;
+  pg();
+}
+
+static void* resolve_foo()
+{
+  pz();
+  return foo_impl;
+}