PR 22843: ld, gold: Add --dependency-file option.

gold/
	* options.h (class General_options): Add --dependency-file option.
	* fileread.cc (File_read::files_read): New static variable.
	(File_read::open): Add the file to the files_read list.
	(File_read::record_file_read): New static member function.
	(File_read::write_dependency_file): New static member function.
	* fileread.h (class File_read): Declare them.
	* layout.cc (Layout::read_layout_from_file): Call record_file_read.
	(Close_task_runner::run): Call write_dependency_file if
	--dependency-file was passed.

ld/
	* NEWS: Note --dependency-file.
	* ld.texi (Options): Document --dependency-file.
	* ldlex.h (enum option_values): Add OPTION_DEPENDENCY_FILE.
	* ld.h (ld_config_type): New member dependency_file.
	* lexsup.c (ld_options, parse_args): Parse --dependency-file.
	* ldmain.c (struct dependency_file): New type.
	(dependency_files, dependency_files_tail): New static variables.
	(track_dependency_files): New function.
	(write_dependency_file): New function.
	(main): Call it when --dependency-file was passed.
	* ldfile.c (ldfile_try_open_bfd): Call track_dependency_files.
	(ldfile_open_command_file_1): Likewise.
	* ldelf.c (ldelf_try_needed): Likewise.
	* pe-dll.c (pe_implied_import_dll): Likewise.

1 files changed, 38 insertions, 32 deletions

diff --git a/gold/layout.cc b/gold/layout.cc
index 0c7be85240e..13e533aaf21 100644
--- a/gold/layout.cc
+++ b/gold/layout.cc
@@ -1183,11 +1183,11 @@ Layout::layout(Sized_relobj_file<size, big_endian>* object, unsigned int shndx,
       // All ".text.unlikely.*" sections can be moved to a unique
       // segment with --text-unlikely-segment option.
       bool text_unlikely_segment
-          = (parameters->options().text_unlikely_segment()
-             && is_prefix_of(".text.unlikely",
-                             object->section_name(shndx).c_str()));
+	  = (parameters->options().text_unlikely_segment()
+	     && is_prefix_of(".text.unlikely",
+			     object->section_name(shndx).c_str()));
       if (text_unlikely_segment)
-        {
+	{
 	  elfcpp::Elf_Xword flags
 	    = this->get_output_section_flags(shdr.get_sh_flags());
 
@@ -1196,11 +1196,11 @@ Layout::layout(Sized_relobj_file<size, big_endian>* object, unsigned int shndx,
 						    &name_key);
 	  os = this->get_output_section(os_name, name_key, sh_type, flags,
 					ORDER_INVALID, false);
-          // Map this output section to a unique segment.  This is done to
-          // separate "text" that is not likely to be executed from "text"
-          // that is likely executed.
+	  // Map this output section to a unique segment.  This is done to
+	  // separate "text" that is not likely to be executed from "text"
+	  // that is likely executed.
 	  os->set_is_unique_segment();
-        }
+	}
       else
 	{
 	  // Plugins can choose to place one or more subsets of sections in
@@ -1221,7 +1221,7 @@ Layout::layout(Sized_relobj_file<size, big_endian>* object, unsigned int shndx,
 	      // We know the name of the output section, directly call
 	      // get_output_section here by-passing choose_output_section.
 	      elfcpp::Elf_Xword flags
-	        = this->get_output_section_flags(shdr.get_sh_flags());
+		= this->get_output_section_flags(shdr.get_sh_flags());
 
 	      const char* os_name = it->second->name;
 	      Stringpool::Key name_key;
@@ -1229,11 +1229,11 @@ Layout::layout(Sized_relobj_file<size, big_endian>* object, unsigned int shndx,
 	      os = this->get_output_section(os_name, name_key, sh_type, flags,
 					ORDER_INVALID, false);
 	      if (!os->is_unique_segment())
-	        {
-	          os->set_is_unique_segment();
-	          os->set_extra_segment_flags(it->second->flags);
-	          os->set_segment_alignment(it->second->align);
-	        }
+		{
+		  os->set_is_unique_segment();
+		  os->set_extra_segment_flags(it->second->flags);
+		  os->set_segment_alignment(it->second->align);
+		}
 	    }
 	  }
       if (os == NULL)
@@ -2268,9 +2268,9 @@ Layout::layout_gnu_property(unsigned int note_type,
       const int size = parameters->target().get_size();
       const bool is_big_endian = parameters->target().is_big_endian();
       if (size == 32)
-        {
-          if (is_big_endian)
-            {
+	{
+	  if (is_big_endian)
+	    {
 #ifdef HAVE_TARGET_32_BIG
 	      parameters->sized_target<32, true>()->
 		  record_gnu_property(note_type, pr_type, pr_datasz, pr_data,
@@ -2278,9 +2278,9 @@ Layout::layout_gnu_property(unsigned int note_type,
 #else
 	      gold_unreachable();
 #endif
-            }
-          else
-            {
+	    }
+	  else
+	    {
 #ifdef HAVE_TARGET_32_LITTLE
 	      parameters->sized_target<32, false>()->
 		  record_gnu_property(note_type, pr_type, pr_datasz, pr_data,
@@ -2288,12 +2288,12 @@ Layout::layout_gnu_property(unsigned int note_type,
 #else
 	      gold_unreachable();
 #endif
-            }
-        }
+	    }
+	}
       else if (size == 64)
-        {
-          if (is_big_endian)
-            {
+	{
+	  if (is_big_endian)
+	    {
 #ifdef HAVE_TARGET_64_BIG
 	      parameters->sized_target<64, true>()->
 		  record_gnu_property(note_type, pr_type, pr_datasz, pr_data,
@@ -2301,9 +2301,9 @@ Layout::layout_gnu_property(unsigned int note_type,
 #else
 	      gold_unreachable();
 #endif
-            }
-          else
-            {
+	    }
+	  else
+	    {
 #ifdef HAVE_TARGET_64_LITTLE
 	      parameters->sized_target<64, false>()->
 		  record_gnu_property(note_type, pr_type, pr_datasz, pr_data,
@@ -2311,10 +2311,10 @@ Layout::layout_gnu_property(unsigned int note_type,
 #else
 	      gold_unreachable();
 #endif
-            }
-        }
+	    }
+	}
       else
-        gold_unreachable();
+	gold_unreachable();
       return;
     }
 
@@ -2922,6 +2922,8 @@ Layout::read_layout_from_file()
     gold_fatal(_("unable to open --section-ordering-file file %s: %s"),
 	       filename, strerror(errno));
 
+  File_read::record_file_read(filename);
+
   std::getline(in, line);   // this chops off the trailing \n, if any
   unsigned int position = 1;
   this->set_section_ordering_specified();
@@ -3299,7 +3301,7 @@ Layout::create_gnu_properties_note()
       write_sized_value(datasz, 4, p + 4, is_big_endian);
       memcpy(p + 8, prop->second.pr_data, datasz);
       if (aligned_datasz > datasz)
-        memset(p + 8 + datasz, 0, aligned_datasz - datasz);
+	memset(p + 8 + datasz, 0, aligned_datasz - datasz);
       p += 8 + aligned_datasz;
     }
   Output_section_data* posd = new Output_data_const(desc, descsz, 4);
@@ -6156,6 +6158,10 @@ Close_task_runner::run(Workqueue*, const Task*)
   if (this->options_->oformat_enum() != General_options::OBJECT_FORMAT_ELF)
     this->layout_->write_binary(this->of_);
 
+  if (this->options_->dependency_file())
+    File_read::write_dependency_file(this->options_->dependency_file(),
+				     this->options_->output_file_name());
+
   this->of_->close();
 }