Properly mark the plugin symbol undefined

Mark the unused plugin defined symbol in elf_link_input_bfd instead of
_bfd_elf_fix_symbol_flags.  Limit the PR ld/12365 test to x86 targets.

bfd/

	PR ld/12365
	PR ld/14272
	* elflink.c (_bfd_elf_fix_symbol_flags): Revert the last change.
	(elf_link_input_bfd): Mark the plugin symbol undefined if it is
	referenced from a non-IR file.

ld/testsuite/

	PR ld/12365
	PR ld/14272
	* ld-plugin/lto.exp: Run the PR ld/12365 test only for x86 targets.
	* ld-plugin/plugin-7.d: Updated.
	* ld-plugin/plugin-8.d: Likewise.

bfd/ChangeLog

@@ -1,3 +1,11 @@
+2015-02-06  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/12365
+	PR ld/14272
+	* elflink.c (_bfd_elf_fix_symbol_flags): Revert the last change.
+	(elf_link_input_bfd): Mark the plugin symbol undefined if it is
+	referenced from a non-IR file.
+
 2015-02-06  Nick Clifton  <nickc@redhat.com>
 
 	PR binutils/17512

bfd/elflink.c

@@ -2423,20 +2423,6 @@ _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h,
     }
   else
     {
-      /* If a plugin symbol is referenced from a non-IR file, mark
-         the symbol as undefined, except for symbol for linker
-	 created section.  */
-      if (h->root.non_ir_ref
-	  && (h->root.type == bfd_link_hash_defined
-	      || h->root.type == bfd_link_hash_defweak)
-	  && (h->root.u.def.section->flags & SEC_LINKER_CREATED) == 0
-	  && h->root.u.def.section->owner != NULL
-	  && (h->root.u.def.section->owner->flags & BFD_PLUGIN) != 0)
-	{
-	  h->root.type = bfd_link_hash_undefined;
-	  h->root.u.undef.abfd = h->root.u.def.section->owner;
-	}
-
       /* Unfortunately, NON_ELF is only correct if the symbol
 	 was first seen in a non-ELF file.  Fortunately, if the symbol
 	 was first seen in an ELF file, we're probably OK unless the
@@ -9807,6 +9793,22 @@ elf_link_input_bfd (struct elf_final_link_info *flinfo, bfd *input_bfd)
 
 		  s_type = h->type;
 
+		  /* If a plugin symbol is referenced from a non-IR file,
+		     mark the symbol as undefined, except for symbol for
+		     linker created section.  */
+		  if (h->root.non_ir_ref
+		      && (h->root.type == bfd_link_hash_defined
+			  || h->root.type == bfd_link_hash_defweak)
+		      && (h->root.u.def.section->flags
+			  & SEC_LINKER_CREATED) == 0
+		      && h->root.u.def.section->owner != NULL
+		      && (h->root.u.def.section->owner->flags
+			  & BFD_PLUGIN) != 0)
+		    {
+		      h->root.type = bfd_link_hash_undefined;
+		      h->root.u.undef.abfd = h->root.u.def.section->owner;
+		    }
+
 		  ps = NULL;
 		  if (h->root.type == bfd_link_hash_defined
 		      || h->root.type == bfd_link_hash_defweak)

ld/testsuite/ChangeLog

@@ -1,3 +1,11 @@
+2015-02-06  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/12365
+	PR ld/14272
+	* ld-plugin/lto.exp: Run the PR ld/12365 test only for x86 targets.
+	* ld-plugin/plugin-7.d: Updated.
+	* ld-plugin/plugin-8.d: Likewise.
+
 2015-02-04  H.J. Lu  <hongjiu.lu@intel.com>
 
 	*  ld-plugin/lto.exp: Pass -flto-partition=none to the PR

ld/testsuite/ld-plugin/lto.exp

@@ -383,6 +383,16 @@ if {![string match "" $catch_output]} {
 
 if { [at_least_gcc_version 4 7] } {
     # Check expected LTO linker errors.
+    # Since the asm symbol name hack in pr12365b.c doesn't work on all
+    # targets, run PR ld/12365 tests only for known targets.
+    if { ([istarget "i?86-*-elf*"]
+	   || (([istarget "i?86-*-linux*"] || [istarget "i?86-*-gnu*"])
+		&& ![istarget "*-*-*aout*"]
+		&& ![istarget "*-*-*oldld*"])
+	   || [istarget "i?86-*-nacl*"]
+	   || [istarget "x86_64-*-nacl*"]
+	   || [istarget "x86_64-*-linux*"]
+	   || [istarget "amd64-*-linux*"]) } {
 	set testname "PR ld/12365"
 	set exec_output [run_host_cmd "$CC" "-O2 -flto -flto-partition=none -fuse-linker-plugin tmpdir/pr12365a.o tmpdir/pr12365b.o tmpdir/pr12365c.o"]
 	if { [ regexp "undefined reference to `my_bcopy'" $exec_output ] } {
@@ -390,6 +400,7 @@ if { [at_least_gcc_version 4 7] } {
 	} {
 	    fail $testname
 	}
+    }
     set testname "PR ld/12942 (3)"
     set exec_output [run_host_cmd "$CXX" "-O2 -flto -fuse-linker-plugin tmpdir/pr12942b.o tmpdir/pr12942a.o"]
     if { [ regexp "undefined reference to `link_error\\(\\)'" $exec_output ] } {

ld/testsuite/ld-plugin/plugin-7.d

@@ -28,6 +28,7 @@ hook called: claim_file tmpdir/func.o \[@0/.* CLAIMED
 hook called: claim_file tmpdir/text.o \[@0/.* not claimed
 #...
 hook called: all symbols read.
-`_?func' referenced in section `\.text.*' of tmpdir/main.o: defined in discarded section .*
+tmpdir/main.o: In function `main':
+.*main.c.*: undefined reference to `func'
 hook called: cleanup.
 #...

ld/testsuite/ld-plugin/plugin-8.d

@@ -32,6 +32,7 @@ hook called: claim_file tmpdir/text.o \[@0/.* not claimed
 hook called: all symbols read.
 Sym: '_?func' Resolution: LDPR_PREVAILING_DEF
 Sym: '_?func2' Resolution: LDPR_PREVAILING_DEF_IRONLY
-`_?func' referenced in section `\.text.*' of tmpdir/main.o: defined in discarded section .*
+tmpdir/main.o: In function `main':
+.*main.c.*: undefined reference to `func'
 hook called: cleanup.
 #...