Return reloc_class_ifunc for reloc against IFUNC

elf_XXX_reloc_type_class should return reloc_class_ifunc for relocation
against STT_GNU_IFUNC symbol.

bfd/

	PR ld/18841
	* elf-bfd.h (elf_link_hash_table): Add dynsym.
	* elf32-i386.c (elf_i386_reloc_type_class): Return
	reloc_class_ifunc for relocation against STT_GNU_IFUNC symbol.
	* elf64-x86-64.c (elf_x86_64_reloc_type_class): Likewise.
	* elflink.c (_bfd_elf_link_create_dynamic_sections): Set dynsym.
	(bfd_elf_size_dynsym_hash_dynstr): Use dynsym.
	(elf_final_link_info): Remove dynsym_sec.
	(elf_link_output_extsym): Replace dynsym_sec with dynsym.
	(bfd_elf_final_link): Remove reference to dynsym_sec.  Replace
	dynsym_sec with dynsym.

ld/testsuite/

	PR ld/18841
	* ld-ifunc/ifunc.exp: Add a test for PR ld/18841.
	* ld-ifunc/pr18841.out: New file.
	* ld-ifunc/pr18841a.c: Likewise.
	* ld-ifunc/pr18841b.c: Likewise.

4 files changed, 50 insertions, 0 deletions

diff --git a/ld/testsuite/ld-ifunc/ifunc.exp b/ld/testsuite/ld-ifunc/ifunc.exp
index 498cb2d..b0f6de0 100644
--- a/ld/testsuite/ld-ifunc/ifunc.exp
+++ b/ld/testsuite/ld-ifunc/ifunc.exp
@@ -472,6 +472,14 @@ run_cc_link_tests [list \
 	{} \
 	"libpr18808.so" \
     ] \
+    [list \
+	"Build libpr18841.so" \
+	"-shared" \
+	"-fPIC -O0 -g" \
+	{ pr18841b.c } \
+	{} \
+	"libpr18841.so" \
+    ] \
 ]
 
 run_ld_link_exec_tests [] [list \
@@ -483,4 +491,12 @@ run_ld_link_exec_tests [] [list \
 	"pr18808" \
 	"pr18808.out" \
     ] \
+    [list \
+	"Run pr18841" \
+	"tmpdir/libpr18841.so" \
+	"" \
+	{ pr18841a.c } \
+	"pr18841" \
+	"pr18841.out" \
+    ] \
 ]
diff --git a/ld/testsuite/ld-ifunc/pr18841.out b/ld/testsuite/ld-ifunc/pr18841.out
new file mode 100644
index 0000000..d86bac9
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr18841.out
@@ -0,0 +1 @@
+OK
diff --git a/ld/testsuite/ld-ifunc/pr18841a.c b/ld/testsuite/ld-ifunc/pr18841a.c
new file mode 100644
index 0000000..72179d2
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr18841a.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+
+extern void test(void);
+
+void zoo(){}
+
+int main()
+{
+  test();
+  printf("OK\n");
+  return 0;
+}
diff --git a/ld/testsuite/ld-ifunc/pr18841b.c b/ld/testsuite/ld-ifunc/pr18841b.c
new file mode 100644
index 0000000..1e87469
--- /dev/null
+++ b/ld/testsuite/ld-ifunc/pr18841b.c
@@ -0,0 +1,21 @@
+void foo() __attribute__((ifunc("resolve_foo")));
+
+static void foo_impl() {}
+
+extern void abort (void);
+void test()
+{
+  void (*pg)(void) = foo;
+  if (pg != foo_impl)
+    abort ();
+  pg();
+}
+
+static void* resolve_foo()
+{
+  extern void zoo(void);
+
+  void (*pz)(void) = zoo;
+  pz();
+  return foo_impl;
+}