lto.c (compare_tree_sccs_1): Compare DECL_ABSTRACT_ORIGIN.

2015-08-31  Richard Biener  <rguenther@suse.de>

	lto/
	* lto.c (compare_tree_sccs_1): Compare DECL_ABSTRACT_ORIGIN.
	* lto-symtab.c (lto_symtab_merge): Merge DECL_POSSIBLY_INLINED flag.
	(lto_symtab_prevailing_decl): Do not replace a decl that didn't
	participate in merging with something else.

From-SVN: r227345

gcc/lto/ChangeLog

 2015-08-31  Richard Biener  <rguenther@suse.de>
 
+	* lto.c (compare_tree_sccs_1): Compare DECL_ABSTRACT_ORIGIN.
+	* lto-symtab.c (lto_symtab_merge): Merge DECL_POSSIBLY_INLINED flag.
+	(lto_symtab_prevailing_decl): Do not replace a decl that didn't
+	participate in merging with something else.
+
+2015-08-31  Richard Biener  <rguenther@suse.de>
+
 	* lto-symtab.c (lto_symtab_prevailing_decl): Remove redundant
 	test, do not replace a non-builtin with a builtin.
 	* lto.c (compare_tree_sccs_1): Do not merge things we stream

gcc/lto/lto-symtab.c

@@ -312,6 +312,11 @@ lto_symtab_merge (symtab_node *prevailing, symtab_node *entry)
 
   if (TREE_CODE (decl) == FUNCTION_DECL)
     {
+      /* Merge decl state in both directions, we may still end up using
+	 the new decl.  */
+      DECL_POSSIBLY_INLINED (prevailing_decl) |= DECL_POSSIBLY_INLINED (decl);
+      DECL_POSSIBLY_INLINED (decl) |= DECL_POSSIBLY_INLINED (prevailing_decl);
+
       if (warn_type_compatibility_p (TREE_TYPE (prevailing_decl),
 			             TREE_TYPE (decl)))
 	return false;
@@ -798,6 +803,18 @@ lto_symtab_prevailing_decl (tree decl)
   if (TREE_CODE (decl) == FUNCTION_DECL && DECL_ABSTRACT_P (decl))
     return decl;
 
+  /* When decl did not participate in symbol resolution leave it alone.
+     This can happen when we streamed the decl as abstract origin
+     from the block tree of inlining a partially inlined function.
+     If all, the split function and the original function end up
+     optimized away early we do not put the abstract origin into the
+     ltrans boundary and we'll end up ICEing in
+     dwarf2out.c:gen_inlined_subroutine_die because we eventually
+     replace a decl with DECL_POSSIBLY_INLINED set with one without.  */
+  if (TREE_CODE (decl) == FUNCTION_DECL
+      && ! cgraph_node::get (decl))
+    return decl;
+
   /* Ensure DECL_ASSEMBLER_NAME will not set assembler name.  */
   gcc_assert (DECL_ASSEMBLER_NAME_SET_P (decl));
 

gcc/lto/lto.c

@@ -1305,6 +1305,7 @@ compare_tree_sccs_1 (tree t1, tree t2, tree **map)
       compare_tree_edges (DECL_SIZE (t1), DECL_SIZE (t2));
       compare_tree_edges (DECL_SIZE_UNIT (t1), DECL_SIZE_UNIT (t2));
       compare_tree_edges (DECL_ATTRIBUTES (t1), DECL_ATTRIBUTES (t2));
+      compare_tree_edges (DECL_ABSTRACT_ORIGIN (t1), DECL_ABSTRACT_ORIGIN (t2));
       if ((code == VAR_DECL
 	   || code == PARM_DECL)
 	  && DECL_HAS_VALUE_EXPR_P (t1))