diff -rupN --no-dereference binutils-2.37/gold/i386.cc binutils-2.37-new/gold/i386.cc

--- binutils-2.37/gold/i386.cc	2021-07-08 13:37:20.000000000 +0200

+++ binutils-2.37-new/gold/i386.cc	2021-07-24 21:59:31.051686692 +0200

@@ -360,7 +360,11 @@ class Target_i386 : public Sized_target<

       got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),

       got_tlsdesc_(NULL), global_offset_table_(NULL), rel_dyn_(NULL),

       rel_irelative_(NULL), copy_relocs_(elfcpp::R_386_COPY),

-      got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)

+      got_mod_index_offset_(-1U), tls_base_symbol_defined_(false),

+      isa_1_used_(0), isa_1_needed_(0),

+      feature_1_(0), feature_2_used_(0), feature_2_needed_(0),

+      object_isa_1_used_(0), object_feature_1_(0),

+      object_feature_2_used_(0), seen_first_object_(false)

   { }

   // Process the relocations to determine unreferenced sections for

@@ -859,6 +863,21 @@ class Target_i386 : public Sized_target<

 				  this->rel_dyn_section(layout));

   }

+  // Record a target-specific program property in the .note.gnu.property

+  // section.

+  void

+  record_gnu_property(unsigned int, unsigned int, size_t,

+		      const unsigned char*, const Object*);

+

+  // Merge the target-specific program properties from the current object.

+  void

+  merge_gnu_properties(const Object*);

+

+  // Finalize the target-specific program properties and add them back to

+  // the layout.

+  void

+  do_finalize_gnu_properties(Layout*) const;

+

   // Information about this specific target which we pass to the

   // general Target structure.

   static const Target::Target_info i386_info;

@@ -898,6 +917,26 @@ class Target_i386 : public Sized_target<

   unsigned int got_mod_index_offset_;

   // True if the _TLS_MODULE_BASE_ symbol has been defined.

   bool tls_base_symbol_defined_;

+

+  // Target-specific program properties, from .note.gnu.property section.

+  // Each bit represents a specific feature.

+  uint32_t isa_1_used_;

+  uint32_t isa_1_needed_;

+  uint32_t feature_1_;

+  uint32_t feature_2_used_;

+  uint32_t feature_2_needed_;

+  // Target-specific properties from the current object.

+  // These bits get ORed into ISA_1_USED_ after all properties for the object

+  // have been processed. But if either is all zeroes (as when the property

+  // is absent from an object), the result should be all zeroes.

+  // (See PR ld/23486.)

+  uint32_t object_isa_1_used_;

+  // These bits get ANDed into FEATURE_1_ after all properties for the object

+  // have been processed.

+  uint32_t object_feature_1_;

+  uint32_t object_feature_2_used_;

+  // Whether we have seen our first object, for use in initializing FEATURE_1_.

+  bool seen_first_object_;

 };

 const Target::Target_info Target_i386::i386_info =

@@ -1042,6 +1081,126 @@ Target_i386::rel_irelative_section(Layou

   return this->rel_irelative_;

 }

+// Record a target-specific program property from the .note.gnu.property

+// section.

+void

+Target_i386::record_gnu_property(

+    unsigned int, unsigned int pr_type,

+    size_t pr_datasz, const unsigned char* pr_data,

+    const Object* object)

+{

+  uint32_t val = 0;

+

+  switch (pr_type)

+    {

+    case elfcpp::GNU_PROPERTY_X86_COMPAT_ISA_1_USED:

+    case elfcpp::GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED:

+    case elfcpp::GNU_PROPERTY_X86_COMPAT_2_ISA_1_USED:

+    case elfcpp::GNU_PROPERTY_X86_COMPAT_2_ISA_1_NEEDED:

+    case elfcpp::GNU_PROPERTY_X86_ISA_1_USED:

+    case elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED:

+    case elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND:

+    case elfcpp::GNU_PROPERTY_X86_FEATURE_2_USED:

+    case elfcpp::GNU_PROPERTY_X86_FEATURE_2_NEEDED:

+      if (pr_datasz != 4)

+	{

+	  gold_warning(_("%s: corrupt .note.gnu.property section "

+			 "(pr_datasz for property %d is not 4)"),

+		       object->name().c_str(), pr_type);

+	  return;

+	}

+      val = elfcpp::Swap<32, false>::readval(pr_data);

+      break;

+    default:

+      gold_warning(_("%s: unknown program property type 0x%x "

+		     "in .note.gnu.property section"),

+		   object->name().c_str(), pr_type);

+      break;

+    }

+

+  switch (pr_type)

+    {

+    case elfcpp::GNU_PROPERTY_X86_ISA_1_USED:

+      this->object_isa_1_used_ |= val;

+      break;

+    case elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED:

+      this->isa_1_needed_ |= val;

+      break;

+    case elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND:

+      // If we see multiple feature props in one object, OR them together.

+      this->object_feature_1_ |= val;

+      break;

+    case elfcpp::GNU_PROPERTY_X86_FEATURE_2_USED:

+      this->object_feature_2_used_ |= val;

+      break;

+    case elfcpp::GNU_PROPERTY_X86_FEATURE_2_NEEDED:

+      this->feature_2_needed_ |= val;

+      break;

+    }

+}

+

+// Merge the target-specific program properties from the current object.

+void

+Target_i386::merge_gnu_properties(const Object*)

+{

+  if (this->seen_first_object_)

+    {

+      // If any object is missing the ISA_1_USED property, we must omit

+      // it from the output file.

+      if (this->object_isa_1_used_ == 0)

+	this->isa_1_used_ = 0;

+      else if (this->isa_1_used_ != 0)

+	this->isa_1_used_ |= this->object_isa_1_used_;

+      this->feature_1_ &= this->object_feature_1_;

+      // If any object is missing the FEATURE_2_USED property, we must

+      // omit it from the output file.

+      if (this->object_feature_2_used_ == 0)

+	this->feature_2_used_ = 0;

+      else if (this->feature_2_used_ != 0)

+	this->feature_2_used_ |= this->object_feature_2_used_;

+    }

+  else

+    {

+      this->isa_1_used_ = this->object_isa_1_used_;

+      this->feature_1_ = this->object_feature_1_;

+      this->feature_2_used_ = this->object_feature_2_used_;

+      this->seen_first_object_ = true;

+    }

+  this->object_isa_1_used_ = 0;

+  this->object_feature_1_ = 0;

+  this->object_feature_2_used_ = 0;

+}

+

+static inline void

+add_property(Layout* layout, unsigned int pr_type, uint32_t val)

+{

+  unsigned char buf[4];

+  elfcpp::Swap<32, false>::writeval(buf, val);

+  layout->add_gnu_property(elfcpp::NT_GNU_PROPERTY_TYPE_0, pr_type, 4, buf);

+}

+

+// Finalize the target-specific program properties and add them back to

+// the layout.

+void

+Target_i386::do_finalize_gnu_properties(Layout* layout) const

+{

+  if (this->isa_1_used_ != 0)

+    add_property(layout, elfcpp::GNU_PROPERTY_X86_ISA_1_USED,

+		 this->isa_1_used_);

+  if (this->isa_1_needed_ != 0)

+    add_property(layout, elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED,

+		 this->isa_1_needed_);

+  if (this->feature_1_ != 0)

+    add_property(layout, elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND,

+		 this->feature_1_);

+  if (this->feature_2_used_ != 0)

+    add_property(layout, elfcpp::GNU_PROPERTY_X86_FEATURE_2_USED,

+		 this->feature_2_used_);

+  if (this->feature_2_needed_ != 0)

+    add_property(layout, elfcpp::GNU_PROPERTY_X86_FEATURE_2_NEEDED,

+		 this->feature_2_needed_);

+}

+

 // Write the first three reserved words of the .got.plt section.

 // The remainder of the section is written while writing the PLT

 // in Output_data_plt_i386::do_write.