re PR bootstrap/63622 (Bootstrap fails on x86_64-apple-darwin1[34] after revision r216305)

PR ipa/63622

        PR ipa/63795
	* g++.dg/ipa/ipa-icf-4.C: Add more precise dump scan.
	* g++.dg/ipa/ipa-icf-5.C: Add condition for target
	with symbol alias support.
	* ipa-icf.c (sem_function::merge): Add new target symbol alias
	support guard.
	(sem_variable::merge): Likewise.
	* ipa-icf.h (target_supports_symbol_aliases_p): New function.

From-SVN: r217355

gcc/ChangeLog

@@ -1,3 +1,12 @@
+2014-11-11  Martin Liska  <mliska@suse.cz>
+
+	PR ipa/63622
+	PR ipa/63795
+	* ipa-icf.c (sem_function::merge): Add new target symbol alias
+	support guard.
+	(sem_variable::merge): Likewise.
+	* ipa-icf.h (target_supports_symbol_aliases_p): New function.
+
 2014-11-11  Richard Biener  <rguenther@suse.de>
 
 	* match.pd: Implement patterns from associate_plusminus

gcc/ipa-icf.c

@@ -191,6 +191,18 @@ sem_item::dump (void)
     }
 }
 
+/* Return true if target supports alias symbols.  */
+
+bool
+sem_item::target_supports_symbol_aliases_p (void)
+{
+#if !defined (ASM_OUTPUT_DEF) || (!defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL))
+  return false;
+#else
+  return true;
+#endif
+}
+
 /* Semantic function constructor that uses STACK as bitmap memory stack.  */
 
 sem_function::sem_function (bitmap_obstack *stack): sem_item (FUNC, stack),
@@ -589,7 +601,8 @@ sem_function::merge (sem_item *alias_item)
       redirect_callers = false;
     }
 
-  if (create_alias && DECL_COMDAT_GROUP (alias->decl))
+  if (create_alias && (DECL_COMDAT_GROUP (alias->decl)
+		       || !sem_item::target_supports_symbol_aliases_p ()))
     {
       create_alias = false;
       create_thunk = true;
@@ -605,6 +618,14 @@ sem_function::merge (sem_item *alias_item)
     local_original
       = dyn_cast <cgraph_node *> (original->noninterposable_alias ());
 
+    if (!local_original)
+      {
+	if (dump_file)
+	  fprintf (dump_file, "Noninterposable alias cannot be created.\n\n");
+
+	return false;
+      }
+
   if (redirect_callers)
     {
       /* If alias is non-overwritable then
@@ -649,7 +670,7 @@ sem_function::merge (sem_item *alias_item)
       alias->resolve_alias (original);
 
       /* Workaround for PR63566 that forces equal calling convention
-	 to be used.  */
+       to be used.  */
       alias->local.local = false;
       original->local.local = false;
 
@@ -1155,6 +1176,13 @@ sem_variable::merge (sem_item *alias_item)
 {
   gcc_assert (alias_item->type == VAR);
 
+  if (!sem_item::target_supports_symbol_aliases_p ())
+    {
+      if (dump_file)
+	fprintf (dump_file, "Symbol aliases are not supported by target\n\n");
+      return false;
+    }
+
   sem_variable *alias_var = static_cast<sem_variable *> (alias_item);
 
   varpool_node *original = get_node ();

gcc/ipa-icf.h

@@ -138,9 +138,11 @@ public:
 
   /* Return base tree that can be used for compatible_types_p and
      contains_polymorphic_type_p comparison.  */
-
   static bool get_base_types (tree *t1, tree *t2);
 
+  /* Return true if target supports alias symbols.  */
+  bool target_supports_symbol_aliases_p (void);
+
   /* Item type.  */
   sem_item_type type;
 

gcc/testsuite/ChangeLog

@@ -1,3 +1,11 @@
+2014-11-11  Martin Liska  <mliska@suse.cz>
+
+	PR ipa/63622
+	PR ipa/63795
+	* g++.dg/ipa/ipa-icf-4.C: Add more precise dump scan.
+	* g++.dg/ipa/ipa-icf-5.C: Add condition for target
+	with symbol alias support.
+
 2014-11-10  Andi Kleen  <ak@linux.intel.com>
 
 	* c-c++-common/cilk-plus/AN/misc.c (main): Handle

gcc/testsuite/g++.dg/ipa/ipa-icf-4.C

@@ -43,6 +43,6 @@ int main()
   return 123;
 }
 
-/* { dg-final { scan-ipa-dump "Varpool alias has been created" "icf"  } } */
+/* { dg-final { scan-ipa-dump "\(Varpool alias has been created\)|\(Symbol aliases are not supported by target\)" "icf"  } } */
 /* { dg-final { scan-ipa-dump "Equal symbols: 6" "icf"  } } */
 /* { dg-final { cleanup-ipa-dump "icf" } } */

gcc/testsuite/g++.dg/ipa/ipa-icf-5.C

@@ -1,5 +1,6 @@
 /* { dg-do compile } */
 /* { dg-require-visibility "" } */
+/* { dg-require-alias "" } */
 /* { dg-options "-O2 -fdump-ipa-icf" } */
 
 struct test