Allow building x32 DSO from x86-64 object file.

bfd/

2011-06-08  H.J. Lu  <hongjiu.lu@intel.com>

	* elf64-x86-64.c (elf_x86_64_check_relocs): Allow R_X86_64_64
	relocations in SEC_DEBUGGING sections when building shared
	libraries.

ld/testsuite/

2011-06-08  H.J. Lu  <hongjiu.lu@intel.com>

	* ld-x86-64/simple.c: New.
	* ld-x86-64/x86-64-x32.rd: Likewise.

	* ld-x86-64/x86-64.exp: Check building x32 DSO from x86-64
	object file.

bfd/ChangeLog

@@ -1,3 +1,9 @@
+2011-06-08  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* elf64-x86-64.c (elf_x86_64_check_relocs): Allow R_X86_64_64
+	relocations in SEC_DEBUGGING sections when building shared
+	libraries.
+
 2011-06-08  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR ld/12851

bfd/elf64-x86-64.c

@@ -1217,6 +1217,13 @@ elf_x86_64_check_relocs (bfd *abfd, struct bfd_link_info *info,
 	    break;
 
 	  case R_X86_64_64:
+	    /* Allow R_X86_64_64 relocations in SEC_DEBUGGING sections
+	       when building shared libraries.  */
+	    if (info->shared
+		&& !info->executable
+		&& (sec->flags & SEC_DEBUGGING) != 0)
+	      break;
+
 	  case R_X86_64_DTPOFF64:
 	  case R_X86_64_TPOFF64:
 	  case R_X86_64_PC64:

ld/testsuite/ChangeLog

@@ -1,3 +1,11 @@
+2011-06-08  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* ld-x86-64/simple.c: New.
+	* ld-x86-64/x86-64-x32.rd: Likewise.
+
+	* ld-x86-64/x86-64.exp: Check building x32 DSO from x86-64
+	object file.
+
 2011-06-08  H.J. Lu  <hongjiu.lu@intel.com>
 
 	PR ld/12851

ld/testsuite/ld-x86-64/simple.c

@@ -0,0 +1,5 @@
+int
+foo (int x)
+{
+  return x * 4;
+}

ld/testsuite/ld-x86-64/x86-64-x32.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]+ +foo
+#...

ld/testsuite/ld-x86-64/x86-64.exp

@@ -203,3 +203,26 @@ run_dump_test "ia32-3"
 run_dump_test "lp64-1"
 run_dump_test "lp64-2"
 run_dump_test "lp64-3"
+
+# Need the C compiler
+if { [which $CC] != 0 } {
+    run_cc_link_tests {
+	{"Helper X32 DSO from x86-64 object" "" "-m64 -fPIC -g"
+	 {simple.c} {} "libsimple.a"}
+    }
+
+    set convertx32 "$objcopy -O elf32-x86-64 tmpdir/simple.o tmpdir/simple-x32.o"
+    send_log "$convertx32\n"
+    set got [remote_exec host "$convertx32"]
+    if { [lindex $got 0] != 0 || ![string match "" [lindex $got 1]] } then {
+	send_log "$got\n"
+	fail "Convert x86-64 object to x32"
+	return
+    }
+
+    run_ld_link_tests {
+	{"X32 DSO from x86-64 object"
+	 "-shared -melf32_x86_64 tmpdir/simple-x32.o" "--x32"
+	{dummy.s} {{readelf {-s --wide} x86-64-x32.rd}} "x86-64-x32"}
+    }
+}