Update third_party/binutils to 2.26, add ICF fix

third_party/binutils/unlock-thin.patch

-commit 2cfbf2fece582c29df348104b28677c38a8301f4
-Author: Cary Coutant <ccoutant@google.com>
-Date:   Tue Feb 3 19:54:57 2015 -0800
-
-    Fix a file descriptor leak in gold.
-    
-    When an LTO linker plugin claims an external member of a thin archive, gold
-    does not properly unlock the file and make its file descriptor available for
-    reuse. This patch fixes the problem by modifying Archive::include_member to
-    unlock the object file via an RAII class instance, ensuring that it will be
-    unlocked no matter what path is taken through the function.
-    
-    gold/
-        PR gold/15660
-        * archive.cc (Thin_archive_object_unlocker): New class.
-        (Archive::include_member): Unlock external members of thin archives.
-        * testsuite/Makefile.am (plugin_test_1): Rename .syms files.
-        (plugin_test_2): Likewise.
-        (plugin_test_3): Likewise.
-        (plugin_test_4): Likewise.
-        (plugin_test_5): Likewise.
-        (plugin_test_6): Likewise.
-        (plugin_test_7): Likewise.
-        (plugin_test_8): Likewise.
-        (plugin_test_9): Likewise.
-        (plugin_test_10): Likewise.
-        (plugin_test_11): New test case.
-        * testsuite/Makefile.in: Regenerate.
-        * testsuite/plugin_test.c (claim_file_hook): Check for parallel .syms
-        file to decide whether to claim file.
-        (all_symbols_read_hook): Likewise.
-        * testsuite/plugin_test_1.sh: Adjust expected output.
-        * testsuite/plugin_test_2.sh: Likewise.
-        * testsuite/plugin_test_3.sh: Likewise.
-        * testsuite/plugin_test_6.sh: Likewise.
-        * testsuite/plugin_test_tls.sh: Likewise.
-        * testsuite/plugin_test_11.sh: New testcase.
-
-diff --git a/gold/archive.cc b/gold/archive.cc
-index 69107f5..6d25980 100644
---- a/gold/archive.cc
-+++ b/gold/archive.cc
-@@ -930,6 +930,32 @@ Archive::count_members()
-   return ret;
- }
- 
-+// RAII class to ensure we unlock the object if it's a member of a
-+// thin archive. We can't use Task_lock_obj in Archive::include_member
-+// because the object file is already locked when it's opened by
-+// get_elf_object_for_member.
-+
-+class Thin_archive_object_unlocker
-+{
-+ public:
-+  Thin_archive_object_unlocker(const Task *task, Object* obj)
-+    : task_(task), obj_(obj)
-+  { }
-+
-+  ~Thin_archive_object_unlocker()
-+  {
-+    if (this->obj_->offset() == 0)
-+      this->obj_->unlock(this->task_);
-+  }
-+
-+ private:
-+  Thin_archive_object_unlocker(const Thin_archive_object_unlocker&);
-+  Thin_archive_object_unlocker& operator=(const Thin_archive_object_unlocker&);
-+
-+  const Task* task_;
-+  Object* obj_;
-+};
-+
- // Include an archive member in the link.  OFF is the file offset of
- // the member header.  WHY is the reason we are including this member.
- // Return true if we added the member or if we had an error, return
-@@ -978,6 +1004,10 @@ Archive::include_member(Symbol_table* symtab, Layout* layout,
-       return unconfigured ? false : true;
-     }
- 
-+  // If the object is an external member of a thin archive,
-+  // unlock it when we're done here.
-+  Thin_archive_object_unlocker unlocker(this->task_, obj);
-+
-   if (mapfile != NULL)
-     mapfile->report_include_archive_member(obj->name(), sym, why);
- 
-@@ -991,31 +1021,21 @@ Archive::include_member(Symbol_table* symtab, Layout* layout,
- 
-   if (!input_objects->add_object(obj))
-     {
--      // If this is an external member of a thin archive, unlock the
--      // file.
--      if (obj->offset() == 0)
--       obj->unlock(this->task_);
-       delete obj;
-+      return true;
-     }
--  else
--    {
--      {
--       if (layout->incremental_inputs() != NULL)
--         layout->incremental_inputs()->report_object(obj, 0, this, NULL);
--       Read_symbols_data sd;
--       obj->read_symbols(&sd);
--       obj->layout(symtab, layout, &sd);
--       obj->add_symbols(symtab, &sd, layout);
--      }
--
--      // If this is an external member of a thin archive, unlock the file
--      // for the next task.
--      if (obj->offset() == 0)
--        obj->unlock(this->task_);
- 
--      this->included_member_ = true;
--    }
-+  if (layout->incremental_inputs() != NULL)
-+    layout->incremental_inputs()->report_object(obj, 0, this, NULL);
-+
-+  {
-+    Read_symbols_data sd;
-+    obj->read_symbols(&sd);
-+    obj->layout(symtab, layout, &sd);
-+    obj->add_symbols(symtab, &sd, layout);
-+  }
- 
-+  this->included_member_ = true;
-   return true;
- }
-