Use parameters to track whether we are doing a static link. Fix up

final_value_is_known for weak undefined symbols.  Pointed out by Cary
Coutant.

gold/gold.cc

@@ -160,6 +160,9 @@ queue_middle_tasks(const General_options& options,
 		   Layout* layout,
 		   Workqueue* workqueue)
 {
+  // Now we have seen all the input files.
+  set_parameters_doing_static_link(!input_objects->any_dynamic());
+
   // Define some sections and symbols needed for a dynamic link.  This
   // handles some cases we want to see before we read the relocs.
   layout->create_initial_dynamic_sections(input_objects, symtab);

gold/parameters.cc

@@ -31,7 +31,8 @@ namespace gold
 // Initialize the parameters from the options.
 
 Parameters::Parameters(const General_options* options)
-  : is_size_and_endian_valid_(false), size_(0), is_big_endian_(false),
+  : is_doing_static_link_valid_(false), doing_static_link_(false),
+    is_size_and_endian_valid_(false), size_(0), is_big_endian_(false),
     optimization_level_(options->optimization_level())
 {
   if (options->is_shared())
@@ -42,6 +43,15 @@ Parameters::Parameters(const General_options* options)
     this->output_file_type_ = OUTPUT_EXECUTABLE;
 }
 
+// Set whether we are doing a static link.
+
+void
+Parameters::set_doing_static_link(bool doing_static_link)
+{
+  this->doing_static_link_ = doing_static_link;
+  this->is_doing_static_link_valid_ = true;
+}
+
 // Set the size and endianness.
 
 void
@@ -76,6 +86,16 @@ initialize_parameters(const General_options* options)
   parameters = static_parameters = new Parameters(options);
 }
 
+// Set whether we are doing a static link.
+
+void
+set_parameters_doing_static_link(bool doing_static_link)
+{
+  static_parameters->set_doing_static_link(doing_static_link);
+}
+
+// Set the size and endianness.
+
 void
 set_parameters_size_and_endianness(int size, bool is_big_endian)
 {

gold/parameters.h

@@ -56,6 +56,16 @@ class Parameters
   output_is_object() const
   { return this->output_file_type_ == OUTPUT_OBJECT; }
 
+  // Whether we are doing a static link--a link in which none of the
+  // input files are shared libraries.  This is only known after we
+  // have seen all the input files.
+  bool
+  doing_static_link() const
+  {
+    gold_assert(this->is_doing_static_link_valid_);
+    return this->doing_static_link_;
+  }
+
   // The size of the output file we are generating.  This should
   // return 32 or 64.
   int
@@ -78,6 +88,10 @@ class Parameters
   optimization_level() const
   { return this->optimization_level_; }
 
+  // Set whether we are doing a static link.
+  void
+  set_doing_static_link(bool doing_static_link);
+
   // Set the size and endianness.
   void
   set_size_and_endianness(int size, bool is_big_endian);
@@ -96,6 +110,10 @@ class Parameters
 
   // The type of the output file.
   Output_file_type output_file_type_;
+  // Whether the doing_static_link_ field is valid.
+  bool is_doing_static_link_valid_;
+  // Whether we are doing a static link.
+  bool doing_static_link_;
   // Whether the size_ and is_big_endian_ fields are valid.
   bool is_size_and_endian_valid_;
   // The size of the output file--32 or 64.
@@ -115,6 +133,9 @@ extern void initialize_parameters(const General_options*);
 // Set the size and endianness of the global parameters variable.
 extern void set_parameters_size_and_endianness(int size, bool is_big_endian);
 
+// Set whether we are doing a static link.
+extern void set_parameters_doing_static_link(bool doing_static_link);
+
 } // End namespace gold.
 
 #endif // !defined(GOLD_PARAMATERS_H)

gold/symtab.cc

@@ -187,6 +187,39 @@ Sized_symbol<size>::init(const char* name, Value_type value, Size_type symsize,
   this->symsize_ = symsize;
 }
 
+// Return true if the final value of this symbol is known at link
+// time.
+
+bool
+Symbol::final_value_is_known() const
+{
+  // If we are not generating an executable, then no final values are
+  // known, since they will change at runtime.
+  if (!parameters->output_is_executable())
+    return false;
+
+  // If the symbol is not from an object file, then it is defined, and
+  // known.
+  if (this->source_ != FROM_OBJECT)
+    return true;
+
+  // If the symbol is from a dynamic object, then the final value is
+  // not known.
+  if (this->object()->is_dynamic())
+    return false;
+
+  // If the symbol is not undefined (it is defined or common), then
+  // the final value is known.
+  if (!this->is_undefined())
+    return true;
+
+  // If the symbol is undefined, then whether the final value is known
+  // depends on whether we are doing a static link.  If we are doing a
+  // dynamic link, then the final value could be filled in at runtime.
+  // This could reasonably be the case for a weak undefined symbol.
+  return parameters->doing_static_link();
+}
+
 // Class Symbol_table.
 
 Symbol_table::Symbol_table()

gold/symtab.h

@@ -341,12 +341,7 @@ class Symbol
   // Return true if the final value of this symbol is known at link
   // time.
   bool
-  final_value_is_known() const
-  {
-    if (parameters->output_is_shared())
-      return false;
-    return this->source_ != FROM_OBJECT || !this->object()->is_dynamic();
-  }
+  final_value_is_known() const;
 
   // Return whether this is a defined symbol (not undefined or
   // common).