Report scripts and libraries searched for ld --trace

The idea of this change is to make -t output useful for users wanting
to package all the object files involved in linking for a bug report.

Something like the following should do the trick.
gcc hello.c -save-temps -Wl,-t | xargs realpath | sort | uniq > files
tar cJf test.tar.xz `cat files`

	* ldlang.c (load_symbols): When -t, print file names for script
	files and archives.
	* ldmain.c (trace_files): Make an int.
	(add_archive_element): Print archive elements only with multiple
	-t options, or when archive is thin.
	* ldmain.h (trace_files): Update.
	* ldmisc.c (vfinfo): Don't print both original path and path in
	sysroot.
	* lexsup.c (parse_args <t>): Increment trace_files.

ld/ChangeLog

@@ -1,3 +1,15 @@
+2018-10-29  Alan Modra  <amodra@gmail.com>
+
+	* ldlang.c (load_symbols): When -t, print file names for script
+	files and archives.
+	* ldmain.c (trace_files): Make an int.
+	(add_archive_element): Print archive elements only with multiple
+	-t options, or when archive is thin.
+	* ldmain.h (trace_files): Update.
+	* ldmisc.c (vfinfo): Don't print both original path and path in
+	sysroot.
+	* lexsup.c (parse_args <t>): Increment trace_files.
+
 2018-10-29  Alan Modra  <amodra@gmail.com>
 
 	* ldmain.c (main): Print emulation mode and "deleting executable"

ld/ldlang.c

@@ -2935,6 +2935,9 @@ load_symbols (lang_input_statement_type *entry,
   if (entry->flags.missing_file)
     return TRUE;
 
+  if (trace_files || verbose)
+    info_msg ("%pI\n", entry);
+
   if (!bfd_check_format (entry->the_bfd, bfd_archive)
       && !bfd_check_format_matches (entry->the_bfd, bfd_object, &matching))
     {
@@ -3010,8 +3013,6 @@ load_symbols (lang_input_statement_type *entry,
     case bfd_object:
       if (!entry->flags.reload)
 	ldlang_add_file (entry);
-      if (trace_files || verbose)
-	info_msg ("%pI\n", entry);
       break;
 
     case bfd_archive:

ld/ldmain.c

@@ -77,7 +77,7 @@ int ld_canon_sysroot_len;
 int g_switch_value = 8;
 
 /* Nonzero means print names of input files as processed.  */
-bfd_boolean trace_files;
+unsigned int trace_files;
 
 /* Nonzero means report actions taken by the linker, and describe the linker script in use.  */
 bfd_boolean verbose;
@@ -926,7 +926,9 @@ add_archive_element (struct bfd_link_info *info,
 	minfo ("(%s)\n", name);
     }
 
-  if (trace_files || verbose)
+  if (verbose
+      || trace_files > 1
+      || (trace_files && bfd_is_thin_archive (orig_input.the_bfd->my_archive)))
     info_msg ("%pI\n", &orig_input);
   return TRUE;
 }

ld/ldmain.h

@@ -29,7 +29,7 @@ extern FILE *saved_script_handle;
 extern FILE *previous_script_handle;
 extern bfd_boolean force_make_executable;
 extern char *default_target;
-extern bfd_boolean trace_files;
+extern unsigned int trace_files;
 extern bfd_boolean verbose;
 extern bfd_boolean version_printed;
 extern bfd_boolean demangling;

ld/ldmisc.c

@@ -476,15 +476,13 @@ vfinfo (FILE *fp, const char *fmt, va_list ap, bfd_boolean is_warning)
 		  fmt++;
 		  i = (lang_input_statement_type *) args[arg_no].p;
 		  ++arg_count;
-		  if (i->the_bfd->my_archive != NULL
+		  if (i->the_bfd != NULL
+		      && i->the_bfd->my_archive != NULL
 		      && !bfd_is_thin_archive (i->the_bfd->my_archive))
-		    fprintf (fp, "(%s)",
+		    fprintf (fp, "(%s)%s", i->the_bfd->my_archive->filename,
-			     bfd_get_filename (i->the_bfd->my_archive));
+			     i->local_sym_name);
-		  fprintf (fp, "%s", i->local_sym_name);
+		  else
-		  if ((i->the_bfd->my_archive == NULL
+		    fprintf (fp, "%s", i->filename);
-		       || bfd_is_thin_archive (i->the_bfd->my_archive))
-		      && filename_cmp (i->local_sym_name, i->filename) != 0)
-		    fprintf (fp, " (%s)", i->filename);
 		}
 	      else if (*fmt == 'R')
 		{

ld/lexsup.c

@@ -1233,7 +1233,7 @@ parse_args (unsigned argc, char **argv)
 	  command_line.symbolic = symbolic_functions;
 	  break;
 	case 't':
-	  trace_files = TRUE;
+	  ++trace_files;
 	  break;
 	case 'T':
 	  previous_script_handle = saved_script_handle;