* ldlang.h (struct lang_output_section_state): Change processed

field's type.
	* ldexp.c (check, invalid): Remove.
	(fold_name): Move valid_p assignments. Create undefined symbol
	when needed. Directly exampine section's processd flag.
	* ldlang.c (lang_output_section_statement_lookup): Adjust
	processed field init.
	(lang_size_sections_1): Allow LOADADDR when determining section's
	VMA. Adjust error message. Fold data statement's expr.
	(lang_size_sections): Correctly increment lang_statement_iteration.

	* ld-scripts/provide.exp: New.
	* ld-scripts/provide-{1,2,3}.{s,t,d}.exp: New.

	* ldexp.c (fold_tree): Follow indirect symbols.

ld/ChangeLog

@@ -1,3 +1,20 @@
+2004-02-23  Nathan Sidwell  <nathan@codesourcery.com>
+
+	* ldlang.h (struct lang_output_section_state): Change processed
+	field's type.
+	* ldexp.c (check, invalid): Remove.
+	(fold_name): Move valid_p assignments. Create undefined symbol
+	when needed. Directly exampine section's processd flag.
+	* ldlang.c (lang_output_section_statement_lookup): Adjust
+	processed field init.
+	(lang_size_sections_1): Allow LOADADDR when determining section's
+	VMA. Adjust error message. Fold data statement's expr.
+	(lang_size_sections): Correctly increment lang_statement_iteration.
+
+2004-02-23  Alan Modra <amodra@bigpond.net.au>
+
+	* ldexp.c (fold_tree): Follow indirect symbols.
+	
 2004-02-20  Nathan Sidwell  <nathan@codesourcery.com>
 
 	* ldgram.y (exp): Add two operand ALIGN.

ld/ldexp.c

@@ -141,17 +141,6 @@ new_abs (bfd_vma value)
   return new;
 }
 
-static void
-check (lang_output_section_statement_type *os,
-       const char *name,
-       const char *op)
-{
-  if (os == NULL)
-    einfo (_("%F%P: %s uses undefined section %s\n"), op, name);
-  if (! os->processed)
-    einfo (_("%F%P: %s forward reference of section %s\n"), op, name);
-}
-
 etree_type *
 exp_intop (bfd_vma value)
 {
@@ -460,14 +449,6 @@ fold_trinary (etree_type *tree,
   return result;
 }
 
-etree_value_type
-invalid (void)
-{
-  etree_value_type new;
-  new.valid_p = FALSE;
-  return new;
-}
-
 static etree_value_type
 fold_name (etree_type *tree,
 	   lang_output_section_statement_type *current_section,
@@ -476,25 +457,18 @@ fold_name (etree_type *tree,
 {
   etree_value_type result;
 
+  result.valid_p = FALSE;
+  
   switch (tree->type.node_code)
     {
     case SIZEOF_HEADERS:
       if (allocation_done != lang_first_phase_enum)
-	{
+	result = new_abs (bfd_sizeof_headers (output_bfd,
-	  result = new_abs (bfd_sizeof_headers (output_bfd,
+					      link_info.relocatable));
-						link_info.relocatable));
-	}
-      else
-	{
-	  result.valid_p = FALSE;
-	}
       break;
     case DEFINED:
       if (allocation_done == lang_first_phase_enum)
-	{
+	lang_track_definedness (tree->name.name);
-	  lang_track_definedness (tree->name.name);
-	  result.valid_p = FALSE;
-	}
       else
 	{
 	  struct bfd_link_hash_entry *h;
@@ -515,13 +489,10 @@ fold_name (etree_type *tree,
 	}
       break;
     case NAME:
-      result.valid_p = FALSE;
       if (tree->name.name[0] == '.' && tree->name.name[1] == 0)
 	{
 	  if (allocation_done != lang_first_phase_enum)
 	    result = new_rel_from_section (dot, current_section);
-	  else
-	    result = invalid ();
 	}
       else if (allocation_done != lang_first_phase_enum)
 	{
@@ -529,10 +500,11 @@ fold_name (etree_type *tree,
 
 	  h = bfd_wrapped_link_hash_lookup (output_bfd, &link_info,
 					    tree->name.name,
-					    FALSE, FALSE, TRUE);
+					    TRUE, FALSE, TRUE);
-	  if (h != NULL
+	  if (!h)
-	      && (h->type == bfd_link_hash_defined
+	    einfo (_("%P%F: bfd_link_hash_lookup failed: %E\n"));
-		  || h->type == bfd_link_hash_defweak))
+	  else if (h->type == bfd_link_hash_defined
+		   || h->type == bfd_link_hash_defweak)
 	    {
 	      if (bfd_is_abs_section (h->u.def.section))
 		result = new_abs (h->u.def.value);
@@ -565,6 +537,12 @@ fold_name (etree_type *tree,
 	  else if (allocation_done == lang_final_phase_enum)
 	    einfo (_("%F%S: undefined symbol `%s' referenced in expression\n"),
 		   tree->name.name);
+	  else if (h->type == bfd_link_hash_new)
+	    {
+	      h->type = bfd_link_hash_undefined;
+	      h->u.undef.abfd = NULL;
+	      bfd_link_add_undef (link_info.hash, h);
+	    }
 	}
       break;
 
@@ -574,11 +552,9 @@ fold_name (etree_type *tree,
 	  lang_output_section_statement_type *os;
 
 	  os = lang_output_section_find (tree->name.name);
-	  check (os, tree->name.name, "ADDR");
+	  if (os && os->processed > 0)
-	  result = new_rel (0, NULL, os);
+	    result = new_rel (0, NULL, os);
 	}
-      else
-	result = invalid ();
       break;
 
     case LOADADDR:
@@ -587,16 +563,16 @@ fold_name (etree_type *tree,
 	  lang_output_section_statement_type *os;
 
 	  os = lang_output_section_find (tree->name.name);
-	  check (os, tree->name.name, "LOADADDR");
+	  if (os && os->processed != 0)
-	  if (os->load_base == NULL)
+	    {
-	    result = new_rel (0, NULL, os);
+	      if (os->load_base == NULL)
-	  else
+		result = new_rel (0, NULL, os);
-	    result = exp_fold_tree_no_dot (os->load_base,
+	      else
-					   abs_output_section,
+		result = exp_fold_tree_no_dot (os->load_base,
-					   allocation_done);
+					       abs_output_section,
+					       allocation_done);
+	    }
 	}
-      else
-	result = invalid ();
       break;
 
     case SIZEOF:
@@ -606,11 +582,9 @@ fold_name (etree_type *tree,
 	  lang_output_section_statement_type *os;
 
 	  os = lang_output_section_find (tree->name.name);
-	  check (os, tree->name.name, "SIZEOF");
+	  if (os && os->processed > 0)
-	  result = new_abs (os->bfd_section->_raw_size / opb);
+	    result = new_abs (os->bfd_section->_raw_size / opb);
 	}
-      else
-	result = invalid ();
       break;
 
     default:
@@ -733,14 +707,15 @@ exp_fold_tree (etree_type *tree,
 	      else
 		create = FALSE;
 	      h = bfd_link_hash_lookup (link_info.hash, tree->assign.dst,
-					create, FALSE, FALSE);
+					create, FALSE, TRUE);
 	      if (h == NULL)
 		{
-		  if (tree->type.node_class == etree_assign)
+		  if (create)
 		    einfo (_("%P%F:%s: hash creation failed\n"),
 			   tree->assign.dst);
 		}
 	      else if (tree->type.node_class == etree_provide
+		       && h->type != bfd_link_hash_new
 		       && h->type != bfd_link_hash_undefined
 		       && h->type != bfd_link_hash_common)
 		{

ld/ldlang.c

@@ -622,7 +622,7 @@ lang_output_section_statement_lookup (const char *const name)
 
       lookup->next = NULL;
       lookup->bfd_section = NULL;
-      lookup->processed = FALSE;
+      lookup->processed = 0;
       lookup->sectype = normal_section;
       lookup->addr_tree = NULL;
       lang_list_init (&lookup->children);
@@ -2984,12 +2984,15 @@ lang_size_sections_1
 		  {
 		    etree_value_type r;
 
+		    os->processed = -1;
 		    r = exp_fold_tree (os->addr_tree,
 				       abs_output_section,
 				       lang_allocating_phase_enum,
 				       dot, &dot);
+		    os->processed = 0;
+		    
 		    if (!r.valid_p)
-		      einfo (_("%F%S: non constant address expression for section %s\n"),
+		      einfo (_("%F%S: non constant or forward reference address expression for section %s\n"),
 			     os->name);
 
 		    dot = r.value + r.section->bfd_section->vma;
@@ -3027,7 +3030,7 @@ lang_size_sections_1
 		= TO_SIZE (after - os->bfd_section->vma);
 
 	    dot = os->bfd_section->vma + TO_ADDR (os->bfd_section->_raw_size);
-	    os->processed = TRUE;
+	    os->processed = 1;
 
 	    if (os->update_dot_tree != 0)
 	      exp_fold_tree (os->update_dot_tree, abs_output_section,
@@ -3089,6 +3092,11 @@ lang_size_sections_1
 	    s->data_statement.output_section =
 	      output_section_statement->bfd_section;
 
+	    /* We might refer to provided symbols in the expression, and
+	       need to mark them as needed.  */
+	    exp_fold_tree (s->data_statement.exp, abs_output_section,
+			   lang_allocating_phase_enum, dot, &dot);
+
 	    switch (s->data_statement.type)
 	      {
 	      default:
@@ -3294,6 +3302,7 @@ lang_size_sections
 	  && first + last <= exp_data_seg.pagesize)
 	{
 	  exp_data_seg.phase = exp_dataseg_adjust;
+	  lang_statement_iteration++;
 	  result = lang_size_sections_1 (s, output_section_statement, prev,
 					 fill, dot, relax, check_regions);
 	}

ld/ldlang.h

@@ -134,7 +134,7 @@ typedef struct lang_output_section_statement_struct
   union lang_statement_union *next;
   const char *name;
 
-  bfd_boolean processed;
+  int processed;
 
   asection *bfd_section;
   flagword flags;		/* Or together of all input sections.  */

ld/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2004-02-23  Nathan Sidwell  <nathan@codesourcery.com>
+
+	* ld-scripts/provide.exp: New.
+	* ld-scripts/provide-{1,2,3}.{s,t,d}.exp: New.
+
 2004-02-23  Alan Modra  <amodra@bigpond.net.au>
 
 	* ld-scripts/data.t: Set ".other" address so location doesn't

ld/testsuite/ld-scripts/provide-1.d

@@ -0,0 +1,8 @@
+#source: provide-1.s
+#ld: -T provide-1.t
+#objdump: -s -j .data
+
+.*:     file format .*
+
+Contents of section .data:
+ 0000 (08)?000000(08)? (0c)?000000(0c)? 00000000           ............    

ld/testsuite/ld-scripts/provide-1.s

@@ -0,0 +1,3 @@
+	.data
+	.globl foo
+foo:	.long 0

ld/testsuite/ld-scripts/provide-1.t

@@ -0,0 +1,11 @@
+SECTIONS 
+{
+  .data :
+  {
+    LONG (foo)
+    LONG (bar)
+    *(.data)
+  }
+  PROVIDE (foo = .);
+  PROVIDE (bar = .);
+}

ld/testsuite/ld-scripts/provide-2.d

@@ -0,0 +1,6 @@
+#source: provide-2.s
+#ld: -T provide-2.t
+#nm: -B
+0+3 A baz
+0+0 D foo
+

ld/testsuite/ld-scripts/provide-2.s

@@ -0,0 +1,6 @@
+	.data
+	.globl foo
+foo:	.long 0
+
+	.globl baz
+	.long baz

ld/testsuite/ld-scripts/provide-2.t

@@ -0,0 +1,10 @@
+SECTIONS 
+{
+  PROVIDE (foo = 1);
+  PROVIDE (bar = 2);
+  PROVIDE (baz = 3);
+  .data :
+  {
+    *(.data)
+  }
+}

ld/testsuite/ld-scripts/provide-3.d

@@ -0,0 +1,3 @@
+#source: provide-2.s
+#ld: -T provide-2.t
+#error: symbol defined in linker script and object file

ld/testsuite/ld-scripts/provide-3.s

@@ -0,0 +1,3 @@
+	.data
+	.globl foo
+foo:	.long 0

ld/testsuite/ld-scripts/provide-3.t

@@ -0,0 +1,11 @@
+SECTIONS 
+{
+  .data :
+  {
+    LONG (foo)
+    LONG (bar)
+    *(.data)
+  }
+  foo = .;
+  bar = .;
+}

ld/testsuite/ld-scripts/provide.exp

@@ -0,0 +1,25 @@
+# Test PROVIDE in a linker script.
+# By Nathan Sidwell, CodeSourcery LLC
+#   Copyright 2004
+#   Free Software Foundation, Inc.
+#
+# This file is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+set testname "provide"
+
+run_dump_test provide-1
+run_dump_test provide-2
+setup_xfail *-*-*
+run_dump_test provide-3