PR gold/12934

* target-select.cc (Target_selector::Target_selector): Add
	emulation parameter.  Change all callers.
	(select_target_by_bfd_name): Rename from select_target_by_name.
	Change all callers.
	(select_target_by_emulation): New function.
	(supported_emulation_names): New function.
	* target-select.h (class Target_selector): Add emulation_ field.
	Update declarations.
	(Target_selector::recognize_by_bfd_name): Rename from
	recognize_by_name.  Change all callers.
	(Target_selector::supported_bfd_names): Rename from
	supported_names.  Change all callers.
	(Target_selector::recognize_by_emulation): New function.
	(Target_selector::supported_emulations): New function.
	(Target_selector::emulation): New function.
	(Target_selector::do_recognize_by_bfd_name): Rename from
	do_recognize_by_name.  Change all callers.
	(Target_selector::do_supported_bfd_names): Rename from
	do_supported_names.  Change all callers.
	(Target_selector::do_recognize_by_emulation): New function.
	(Target_selector::do_supported_emulations): New function.
	(select_target_by_bfd_name): Change name in declaration.
	(select_target_by_emulation): Declare.
	(supported_emulation_names): Declare.
	* parameters.cc (parameters_force_valid_target): Try to find
	target based on emulation from -m option.
	* options.h (class General_options): Change doc string for -m.
	* options.cc (help): Print emulations.
	(General_options::parse_V): Likewise.
	* freebsd.h (Target_selector_freebsd::Target_selector_freebsd):
	Add emulation parameter.  Change all callers.

gold/ChangeLog

@@ -1,3 +1,38 @@
+2011-06-28  Ian Lance Taylor  <iant@google.com>
+
+	PR gold/12934
+	* target-select.cc (Target_selector::Target_selector): Add
+	emulation parameter.  Change all callers.
+	(select_target_by_bfd_name): Rename from select_target_by_name.
+	Change all callers.
+	(select_target_by_emulation): New function.
+	(supported_emulation_names): New function.
+	* target-select.h (class Target_selector): Add emulation_ field.
+	Update declarations.
+	(Target_selector::recognize_by_bfd_name): Rename from
+	recognize_by_name.  Change all callers.
+	(Target_selector::supported_bfd_names): Rename from
+	supported_names.  Change all callers.
+	(Target_selector::recognize_by_emulation): New function.
+	(Target_selector::supported_emulations): New function.
+	(Target_selector::emulation): New function.
+	(Target_selector::do_recognize_by_bfd_name): Rename from
+	do_recognize_by_name.  Change all callers.
+	(Target_selector::do_supported_bfd_names): Rename from
+	do_supported_names.  Change all callers.
+	(Target_selector::do_recognize_by_emulation): New function.
+	(Target_selector::do_supported_emulations): New function.
+	(select_target_by_bfd_name): Change name in declaration.
+	(select_target_by_emulation): Declare.
+	(supported_emulation_names): Declare.
+	* parameters.cc (parameters_force_valid_target): Try to find
+	target based on emulation from -m option.
+	* options.h (class General_options): Change doc string for -m.
+	* options.cc (help): Print emulations.
+	(General_options::parse_V): Likewise.
+	* freebsd.h (Target_selector_freebsd::Target_selector_freebsd):
+	Add emulation parameter.  Change all callers.
+
 2011-06-28  Ian Lance Taylor  <iant@google.com>
 
 	* target.h (class Target): Add osabi_ field.

gold/arm.cc

@@ -11904,7 +11904,8 @@ class Target_selector_arm : public Target_selector
  public:
   Target_selector_arm()
     : Target_selector(elfcpp::EM_ARM, 32, big_endian,
-		      (big_endian ? "elf32-bigarm" : "elf32-littlearm"))
+		      (big_endian ? "elf32-bigarm" : "elf32-littlearm"),
+		      (big_endian ? "armelfb" : "armelf"))
   { }
 
   Target*

gold/freebsd.h

@@ -38,8 +38,9 @@ class Target_selector_freebsd : public Target_selector
  public:
   Target_selector_freebsd(int machine, int size, bool is_big_endian,
 			  const char* bfd_name,
-			  const char* freebsd_bfd_name)
-    : Target_selector(machine, size, is_big_endian, NULL),
+			  const char* freebsd_bfd_name,
+			  const char* emulation)
+    : Target_selector(machine, size, is_big_endian, NULL, emulation),
       bfd_name_(bfd_name), freebsd_bfd_name_(freebsd_bfd_name)
   { }
 
@@ -57,7 +58,7 @@ class Target_selector_freebsd : public Target_selector
   
   // Recognize two names.
   virtual Target*
-  do_recognize_by_name(const char* name)
+  do_recognize_by_bfd_name(const char* name)
   {
     if (strcmp(name, this->bfd_name_) == 0)
       return this->instantiate_target();
@@ -73,7 +74,7 @@ class Target_selector_freebsd : public Target_selector
 
   // Print both names in --help output.
   virtual void
-  do_supported_names(std::vector<const char*>* names)
+  do_supported_bfd_names(std::vector<const char*>* names)
   {
     names->push_back(this->bfd_name_);
     names->push_back(this->freebsd_bfd_name_);

gold/i386.cc

@@ -3284,7 +3284,8 @@ class Target_selector_i386 : public Target_selector_freebsd
 public:
   Target_selector_i386()
     : Target_selector_freebsd(elfcpp::EM_386, 32, false,
-			      "elf32-i386", "elf32-i386-freebsd")
+			      "elf32-i386", "elf32-i386-freebsd",
+			      "elf_i386")
   { }
 
   Target*

gold/options.cc

@@ -1,6 +1,6 @@
 // options.c -- handle command line options for gold
 
-// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of gold.
@@ -170,6 +170,15 @@ help()
     printf(" %s", *p);
   printf("\n");
 
+  printf(_("%s: supported emulations:"), gold::program_name);
+  supported_names.clear();
+  gold::supported_emulation_names(&supported_names);
+  for (std::vector<const char*>::const_iterator p = supported_names.begin();
+       p != supported_names.end();
+       ++p)
+    printf(" %s", *p);
+  printf("\n");
+
   // REPORT_BUGS_TO is defined in bfd/bfdver.h.
   const char* report = REPORT_BUGS_TO;
   if (*report != '\0')
@@ -300,6 +309,7 @@ General_options::parse_V(const char*, const char*, Command_line*)
 {
   gold::print_version(true);
   this->printed_version_ = true;
+
   printf(_("  Supported targets:\n"));
   std::vector<const char*> supported_names;
   gold::supported_target_names(&supported_names);
@@ -307,6 +317,14 @@ General_options::parse_V(const char*, const char*, Command_line*)
        p != supported_names.end();
        ++p)
     printf("   %s\n", *p);
+
+  printf(_("  Supported emulations:\n"));
+  supported_names.clear();
+  gold::supported_emulation_names(&supported_names);
+  for (std::vector<const char*>::const_iterator p = supported_names.begin();
+       p != supported_names.end();
+       ++p)
+    printf("   %s\n", *p);
 }
 
 void

gold/options.h

@@ -835,7 +835,7 @@ class General_options
               NULL);
 
   DEFINE_string(m, options::EXACTLY_ONE_DASH, 'm', "",
-                N_("Ignored for compatibility"), N_("EMULATION"));
+                N_("Set GNU linker emulation; obsolete"), N_("EMULATION"));
 
   DEFINE_bool(print_map, options::TWO_DASHES, 'M', false,
 	      N_("Write map file on standard output"), NULL);

gold/parameters.cc

@@ -1,6 +1,6 @@
 // parameters.cc -- general parameters for a link using gold
 
-// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of gold.
@@ -299,15 +299,28 @@ parameters_force_valid_target()
   gold_assert(parameters->options_valid());
   if (parameters->options().user_set_oformat())
     {
-      Target* target = select_target_by_name(parameters->options().oformat());
+      const char* bfd_name = parameters->options().oformat();
+      Target* target = select_target_by_bfd_name(bfd_name);
       if (target != NULL)
 	{
 	  set_parameters_target(target);
 	  return;
 	}
 
-      gold_error(_("unrecognized output format %s"),
-                 parameters->options().oformat());
+      gold_error(_("unrecognized output format %s"), bfd_name);
+    }
+
+  if (parameters->options().user_set_m())
+    {
+      const char* emulation = parameters->options().m();
+      Target* target = select_target_by_emulation(emulation);
+      if (target != NULL)
+	{
+	  set_parameters_target(target);
+	  return;
+	}
+
+      gold_error(_("unrecognized emulation %s"), emulation);
     }
 
   // The GOLD_DEFAULT_xx macros are defined by the configure script.

gold/powerpc.cc

@@ -2124,9 +2124,12 @@ class Target_selector_powerpc : public Target_selector
 public:
   Target_selector_powerpc()
     : Target_selector(elfcpp::EM_NONE, size, big_endian,
-		      (size == 64 ?
-		       (big_endian ? "elf64-powerpc" : "elf64-powerpcle") :
-		       (big_endian ? "elf32-powerpc" : "elf32-powerpcle")))
+		      (size == 64
+		       ? (big_endian ? "elf64-powerpc" : "elf64-powerpcle")
+		       : (big_endian ? "elf32-powerpc" : "elf32-powerpcle")),
+		      (size == 64
+		       ? (big_endian ? "elf64ppc" : "elf64lppc")
+		       : (big_endian ? "elf32ppc" : "elf32lppc")))
   { }
 
   Target* do_recognize(int machine, int, int)

gold/script.cc

@@ -1,6 +1,6 @@
 // script.cc -- handle linker scripts for gold.
 
-// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of gold.
@@ -2804,7 +2804,7 @@ script_check_output_format(void* closurev,
 {
   Parser_closure* closure = static_cast<Parser_closure*>(closurev);
   std::string name(default_name, default_length);
-  Target* target = select_target_by_name(name.c_str());
+  Target* target = select_target_by_bfd_name(name.c_str());
   if (target == NULL || !parameters->is_compatible_target(target))
     {
       if (closure->skip_on_incompatible_target())

gold/sparc.cc

@@ -3481,7 +3481,8 @@ class Target_selector_sparc : public Target_selector
 public:
   Target_selector_sparc()
     : Target_selector(elfcpp::EM_NONE, size, big_endian,
-		      (size == 64 ? "elf64-sparc" : "elf32-sparc"))
+		      (size == 64 ? "elf64-sparc" : "elf32-sparc"),
+		      (size == 64 ? "elf64_sparc" : "elf32_sparc"))
   { }
 
   Target* do_recognize(int machine, int, int)

gold/target-select.cc

@@ -1,6 +1,6 @@
 // target-select.cc -- select a target for an object file
 
-// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of gold.
@@ -52,9 +52,10 @@ Set_target_once::do_run_once(void*)
 // fast.
 
 Target_selector::Target_selector(int machine, int size, bool is_big_endian,
-				 const char* bfd_name)
+				 const char* bfd_name, const char* emulation)
   : machine_(machine), size_(size), is_big_endian_(is_big_endian),
-    bfd_name_(bfd_name), instantiated_target_(NULL), set_target_once_(this)
+    bfd_name_(bfd_name), emulation_(emulation), instantiated_target_(NULL),
+    set_target_once_(this)
 {
   this->next_ = target_selectors;
   target_selectors = this;
@@ -104,14 +105,33 @@ select_target(int machine, int size, bool is_big_endian, int osabi,
 // --oformat option.
 
 Target*
-select_target_by_name(const char* name)
+select_target_by_bfd_name(const char* name)
 {
   for (Target_selector* p = target_selectors; p != NULL; p = p->next())
     {
       const char* pname = p->bfd_name();
       if (pname == NULL || strcmp(pname, name) == 0)
 	{
-	  Target* ret = p->recognize_by_name(name);
+	  Target* ret = p->recognize_by_bfd_name(name);
+	  if (ret != NULL)
+	    return ret;
+	}
+    }
+  return NULL;
+}
+
+// Find a target using a GNU linker emulation.  This is used to
+// support the -m option.
+
+Target*
+select_target_by_emulation(const char* name)
+{
+  for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+    {
+      const char* pname = p->emulation();
+      if (pname == NULL || strcmp(pname, name) == 0)
+	{
+	  Target* ret = p->recognize_by_emulation(name);
 	  if (ret != NULL)
 	    return ret;
 	}
@@ -125,7 +145,16 @@ void
 supported_target_names(std::vector<const char*>* names)
 {
   for (Target_selector* p = target_selectors; p != NULL; p = p->next())
-    p->supported_names(names);
+    p->supported_bfd_names(names);
+}
+
+// Push all the supported emulations onto a vector.
+
+void
+supported_emulation_names(std::vector<const char*>* names)
+{
+  for (Target_selector* p = target_selectors; p != NULL; p = p->next())
+    p->supported_emulations(names);
 }
 
 } // End namespace gold.

gold/target-select.h

@@ -1,6 +1,6 @@
 // target-select.h -- select a target for an object file  -*- C++ -*-
 
-// Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
 // Written by Ian Lance Taylor <iant@google.com>.
 
 // This file is part of gold.
@@ -65,9 +65,10 @@ class Target_selector
   // or 64), and endianness.  The machine number can be EM_NONE to
   // test for any machine number.  BFD_NAME is the name of the target
   // used by the GNU linker, for backward compatibility; it may be
-  // NULL.
+  // NULL.  EMULATION is the name of the emulation used by the GNU
+  // linker; it is similar to BFD_NAME.
   Target_selector(int machine, int size, bool is_big_endian,
-		  const char* bfd_name);
+		  const char* bfd_name, const char* emulation);
 
   virtual ~Target_selector()
   { }
@@ -81,14 +82,26 @@ class Target_selector
   // If NAME matches the target, return a pointer to a target
   // structure.
   Target*
-  recognize_by_name(const char* name)
-  { return this->do_recognize_by_name(name); }
+  recognize_by_bfd_name(const char* name)
+  { return this->do_recognize_by_bfd_name(name); }
 
-  // Push all supported names onto the vector.  This is only used for
-  // help output.
+  // Push all supported BFD names onto the vector.  This is only used
+  // for help output.
   void
-  supported_names(std::vector<const char*>* names)
-  { this->do_supported_names(names); }
+  supported_bfd_names(std::vector<const char*>* names)
+  { this->do_supported_bfd_names(names); }
+
+  // If NAME matches the target emulation, return a pointer to a
+  // target structure.
+  Target*
+  recognize_by_emulation(const char* name)
+  { return this->do_recognize_by_emulation(name); }
+
+  // Push all supported emulations onto the vector.  This is only used
+  // for help output.
+  void
+  supported_emulations(std::vector<const char*>* names)
+  { this->do_supported_emulations(names); }
 
   // Return the next Target_selector in the linked list.
   Target_selector*
@@ -114,12 +127,19 @@ class Target_selector
   { return this->is_big_endian_; }
 
   // Return the BFD name.  This may return NULL, in which case the
-  // do_recognize_by_name hook will be responsible for matching the
-  // BFD name.
+  // do_recognize_by_bfd_name hook will be responsible for matching
+  // the BFD name.
   const char*
   bfd_name() const
   { return this->bfd_name_; }
 
+  // Return the emulation.  This may return NULL, in which case the
+  // do_recognize_by_emulation hook will be responsible for matching
+  // the emulation.
+  const char*
+  emulation() const
+  { return this->emulation_; }
+
  protected:
   // Return an instance of the real target.  This must be implemented
   // by the child class.
@@ -141,19 +161,37 @@ class Target_selector
   // child class may implement a different version of this to
   // recognize more than one name.
   virtual Target*
-  do_recognize_by_name(const char*)
+  do_recognize_by_bfd_name(const char*)
   { return this->instantiate_target(); }
 
   // Return a list of supported BFD names.  The child class may
   // implement a different version of this to handle more than one
   // name.
   virtual void
-  do_supported_names(std::vector<const char*>* names)
+  do_supported_bfd_names(std::vector<const char*>* names)
   {
     gold_assert(this->bfd_name_ != NULL);
     names->push_back(this->bfd_name_);
   }
 
+  // Recognize a target by emulation.  When this is called we already
+  // know that the name matches (or that the emulation_ field is
+  // NULL).  The child class may implement a different version of this
+  // to recognize more than one emulation.
+  virtual Target*
+  do_recognize_by_emulation(const char*)
+  { return this->instantiate_target(); }
+
+  // Return a list of supported emulations.  The child class may
+  // implement a different version of this to handle more than one
+  // emulation.
+  virtual void
+  do_supported_emulations(std::vector<const char*>* emulations)
+  {
+    gold_assert(this->emulation_ != NULL);
+    emulations->push_back(this->emulation_);
+  }
+
   // Instantiate the target and return it.
   Target*
   instantiate_target();
@@ -173,6 +211,8 @@ class Target_selector
   const bool is_big_endian_;
   // BFD name of target, for compatibility.
   const char* const bfd_name_;
+  // GNU linker emulation for this target, for compatibility.
+  const char* const emulation_;
   // Next entry in list built at global constructor time.
   Target_selector* next_;
   // The singleton Target structure--this points to an instance of the
@@ -191,7 +231,12 @@ select_target(int machine, int size, bool big_endian, int osabi,
 // Select a target using a BFD name.
 
 extern Target*
-select_target_by_name(const char* name);
+select_target_by_bfd_name(const char* name);
+
+// Select a target using a GNU linker emulation.
+
+extern Target*
+select_target_by_emulation(const char* name);
 
 // Fill in a vector with the list of supported targets.  This returns
 // a list of BFD names.
@@ -199,6 +244,11 @@ select_target_by_name(const char* name);
 extern void
 supported_target_names(std::vector<const char*>*);
 
+// Fill in a vector with the list of supported emulations.
+
+extern void
+supported_emulation_names(std::vector<const char*>*);
+
 } // End namespace gold.
 
 #endif // !defined(GOLD_TARGET_SELECT_H)

gold/testsuite/testfile.cc

@@ -151,7 +151,7 @@ class Target_selector_test : public Target_selector
 {
  public:
   Target_selector_test()
-    : Target_selector(0xffff, size, big_endian, NULL)
+    : Target_selector(0xffff, size, big_endian, NULL, NULL)
   { }
 
   Target*

gold/x86_64.cc

@@ -3648,7 +3648,7 @@ class Target_selector_x86_64 : public Target_selector_freebsd
 public:
   Target_selector_x86_64()
     : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64",
-			      "elf64-x86-64-freebsd")
+			      "elf64-x86-64-freebsd", "elf_x86_64")
   { }
 
   Target*