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, 16 insertions, 12 deletions

diff --git a/ld/ldfile.c b/ld/ldfile.c
index f3de2c2..e39170b 100644
--- a/ld/ldfile.c
+++ b/ld/ldfile.c
@@ -142,6 +142,8 @@ ldfile_try_open_bfd (const char *attempt,
       return FALSE;
     }
 
+  track_dependency_files (attempt);
+
   /* Linker needs to decompress sections.  */
   entry->the_bfd->flags |= BFD_DECOMPRESS;
 
@@ -416,21 +418,21 @@ ldfile_open_file (lang_input_statement_type *entry)
       bfd_boolean found = FALSE;
 
       /* If extra_search_path is set, entry->filename is a relative path.
-         Search the directory of the current linker script before searching
-         other paths. */
+	 Search the directory of the current linker script before searching
+	 other paths. */
       if (entry->extra_search_path)
-        {
-          char *path = concat (entry->extra_search_path, slash, entry->filename,
-                               (const char *)0);
-          if (ldfile_try_open_bfd (path, entry))
-            {
-              entry->filename = path;
-              entry->flags.search_dirs = FALSE;
-              return;
-            }
+	{
+	  char *path = concat (entry->extra_search_path, slash, entry->filename,
+			       (const char *)0);
+	  if (ldfile_try_open_bfd (path, entry))
+	    {
+	      entry->filename = path;
+	      entry->flags.search_dirs = FALSE;
+	      return;
+	    }
 
 	  free (path);
-        }
+	}
 
       /* Try to open <filename><suffix> or lib<filename><suffix>.a.  */
       for (arch = search_arch_head; arch != NULL; arch = arch->next)
@@ -675,6 +677,8 @@ ldfile_open_command_file_1 (const char *name, enum script_open_style open_how)
       return;
     }
 
+  track_dependency_files (name);
+
   lex_push_file (ldlex_input_stack, name, sysrooted);
 
   lineno = 1;