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, 14 insertions, 8 deletions

diff --git a/ld/lexsup.c b/ld/lexsup.c
index 65a9453..48c6eca 100644
--- a/ld/lexsup.c
+++ b/ld/lexsup.c
@@ -111,6 +111,8 @@ static const struct ld_option ld_options[] =
     'c', N_("FILE"), N_("Read MRI format linker script"), TWO_DASHES },
   { {"dc", no_argument, NULL, 'd'},
     'd', NULL, N_("Force common symbols to be defined"), ONE_DASH },
+  { {"dependency-file", required_argument, NULL, OPTION_DEPENDENCY_FILE},
+    '\0', N_("FILE"), N_("Write dependency file"), TWO_DASHES },
   { {"dp", no_argument, NULL, 'd'},
     '\0', NULL, NULL, ONE_DASH },
   { {"force-group-allocation", no_argument, NULL,
@@ -1441,7 +1443,7 @@ parse_args (unsigned argc, char **argv)
 	      = lang_new_vers_pattern (NULL, xstrdup (optarg), NULL,
 				       FALSE);
 	    lang_append_dynamic_list (&export_list, expr);
-          }
+	  }
 	  break;
 	case OPTION_EXPORT_DYNAMIC_SYMBOL_LIST:
 	  /* This option indicates a small script that only specifies
@@ -1631,6 +1633,10 @@ parse_args (unsigned argc, char **argv)
 	case OPTION_PRINT_MAP_DISCARDED:
 	  config.print_map_discarded = TRUE;
 	  break;
+
+	case OPTION_DEPENDENCY_FILE:
+	  config.dependency_file = optarg;
+	  break;
 	}
     }
 
@@ -1906,14 +1912,14 @@ elf_shlib_list_options (FILE *file)
     }
   fprintf (file, _("\
   -P AUDITLIB, --depaudit=AUDITLIB\n" "\
-                              Specify a library to use for auditing dependencies\n"));
+			      Specify a library to use for auditing dependencies\n"));
   fprintf (file, _("\
   -z combreloc                Merge dynamic relocs into one section and sort\n"));
   fprintf (file, _("\
   -z nocombreloc              Don't merge dynamic relocs into one section\n"));
   fprintf (file, _("\
   -z global                   Make symbols in DSO available for subsequently\n\
-                               loaded objects\n"));
+			       loaded objects\n"));
   fprintf (file, _("\
   -z initfirst                Mark DSO to be initialized first at runtime\n"));
   fprintf (file, _("\
@@ -1936,7 +1942,7 @@ elf_shlib_list_options (FILE *file)
   -z now                      Mark object non-lazy runtime binding\n"));
   fprintf (file, _("\
   -z origin                   Mark object requiring immediate $ORIGIN\n\
-                                processing at runtime\n"));
+				processing at runtime\n"));
 #if DEFAULT_LD_Z_RELRO
   fprintf (file, _("\
   -z relro                    Create RELRO program header (default)\n"));
@@ -1994,13 +2000,13 @@ elf_static_list_options (FILE *file)
   --build-id[=STYLE]          Generate build ID note\n"));
   fprintf (file, _("\
   --compress-debug-sections=[none|zlib|zlib-gnu|zlib-gabi]\n\
-                              Compress DWARF debug sections using zlib\n"));
+			      Compress DWARF debug sections using zlib\n"));
 #ifdef DEFAULT_FLAG_COMPRESS_DEBUG
   fprintf (file, _("\
-                               Default: zlib-gabi\n"));
+			       Default: zlib-gabi\n"));
 #else
   fprintf (file, _("\
-                               Default: none\n"));
+			       Default: none\n"));
 #endif
   fprintf (file, _("\
   -z common-page-size=SIZE    Set common page size to SIZE\n"));
@@ -2025,7 +2031,7 @@ elf_plt_unwind_list_options (FILE *file)
   --ld-generated-unwind-info  Generate exception handling info for PLT\n"));
   fprintf (file, _("\
   --no-ld-generated-unwind-info\n\
-                              Don't generate exception handling info for PLT\n"));
+			      Don't generate exception handling info for PLT\n"));
 }
 
 static void