From a93d6d0708cec0f69b8aaa28c847dd43195fe106 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <iant@google.com>
Date: Thu, 20 Sep 2007 05:56:14 +0000
Subject: [PATCH] Rework patch to check by both armap entry and archive offset.
  Also, preserve information for --group.

---
 gold/archive.cc | 45 ++++++++++++++++++++++++---------------------
 gold/archive.h  | 13 +++++++++++++
 2 files changed, 37 insertions(+), 21 deletions(-)

diff --git a/gold/archive.cc b/gold/archive.cc
index 64523d2..8603dc6 100644
--- a/gold/archive.cc
+++ b/gold/archive.cc
@@ -121,6 +121,10 @@ Archive::read_armap(off_t start, off_t size)
 	      program_name, this->name().c_str());
       gold_exit(false);
     }
+
+  // This array keeps track of which symbols are for archive elements
+  // which we have already included in the link.
+  this->armap_checked_.resize(nsyms);
 }
 
 // Read the header of an archive member at OFF.  Fail if something
@@ -226,14 +230,6 @@ Archive::interpret_header(const Archive_header* hdr, off_t off,
   return member_size;
 }
 
-// A simple hash code for off_t values.
-class Seen_hash
-{
- public:
-  size_t operator()(off_t val) const
-  { return static_cast<size_t>(val); }
-};
-
 // Select members from the archive and add them to the link.  We walk
 // through the elements in the archive map, and look each one up in
 // the symbol table.  If it exists as a strong undefined symbol, we
@@ -250,13 +246,13 @@ Archive::add_symbols(const General_options& options, Symbol_table* symtab,
 
   const size_t armap_size = this->armap_.size();
 
-  // Track which elements in the archive map have already been included
-  // in the link.  Elements are identified by their offset.
-  Unordered_set<off_t, Seen_hash> seen;
   // This is a quick optimization, since we usually see many symbols
   // in a row with the same offset.  last_seen holds the last offset
   // we saw that was present in the seen_ set.
-  off_t last_seen = -1;
+  off_t last_seen_offset = -1;
+
+  // Track which symbols in the symbol table we've already found to be
+  // defined.
 
   bool added_new_object;
   do
@@ -264,11 +260,18 @@ Archive::add_symbols(const General_options& options, Symbol_table* symtab,
       added_new_object = false;
       for (size_t i = 0; i < armap_size; ++i)
 	{
-	  if (this->armap_[i].offset == last_seen)
-	    continue;
-	  if (seen.find(this->armap_[i].offset) != seen.end())
+          if (this->armap_checked_[i])
+            continue;
+	  if (this->armap_[i].offset == last_seen_offset)
+            {
+              this->armap_checked_[i] = true;
+              continue;
+            }
+	  if (this->seen_offsets_.find(this->armap_[i].offset)
+              != this->seen_offsets_.end())
 	    {
-	      last_seen = this->armap_[i].offset;
+              this->armap_checked_[i] = true;
+	      last_seen_offset = this->armap_[i].offset;
 	      continue;
 	    }
 
@@ -277,18 +280,18 @@ Archive::add_symbols(const General_options& options, Symbol_table* symtab,
 	    continue;
 	  else if (!sym->is_undefined())
 	    {
-	      seen.insert(this->armap_[i].offset);
-	      last_seen = this->armap_[i].offset;
+              this->armap_checked_[i] = true;
 	      continue;
 	    }
 	  else if (sym->binding() == elfcpp::STB_WEAK)
 	    continue;
 
 	  // We want to include this object in the link.
-	  last_seen = this->armap_[i].offset;
-	  seen.insert(last_seen);
+	  last_seen_offset = this->armap_[i].offset;
+	  this->seen_offsets_.insert(last_seen_offset);
+          this->armap_checked_[i] = true;
 	  this->include_member(options, symtab, layout, input_objects,
-			       last_seen);
+			       last_seen_offset);
 	  added_new_object = true;
 	}
     }
diff --git a/gold/archive.h b/gold/archive.h
index 33a7233..4f4c7f3 100644
--- a/gold/archive.h
+++ b/gold/archive.h
@@ -115,6 +115,14 @@ class Archive
     off_t offset;
   };
 
+  // A simple hash code for off_t values.
+  class Seen_hash
+  {
+   public:
+    size_t operator()(off_t val) const
+    { return static_cast<size_t>(val); }
+  };
+
   // Name of object as printed to user.
   std::string name_;
   // For reading the file.
@@ -123,6 +131,11 @@ class Archive
   std::vector<Armap_entry> armap_;
   // The extended name table.
   std::string extended_names_;
+  // Track which symbols in the archive map are for elements which are
+  // defined or which have already been included in the link.
+  std::vector<bool> armap_checked_;
+  // Track which elements have been included by offset.
+  Unordered_set<off_t, Seen_hash> seen_offsets_;
 };
 
 // This class is used to read an archive and pick out the desired
-- 
2.7.4