tree.c (type_in_anonymous_namespace_p): Ignore TREE_PUBLIC on builtin types.

	* tree.c (type_in_anonymous_namespace_p): Ignore TREE_PUBLIC
	on builtin types.
	* ipa-devirt.c: Include stor-layout.h and intl.h
	(odr_subtypes_equivalent_p): New function.
	(warn_odr): New function.
	(warn_type_mismatch): New function.
	(odr_types_equivalent_p): New function.
	(add_type_duplicate): Use it.
	* common.opt (Wodr): New flag.
	* doc/invoke.texi (Wodr): Document new warning.

From-SVN: r212481

gcc/ChangeLog

 2014-07-12  Jan Hubicka  <hubicka@ucw.cz>
 
+	* tree.c (type_in_anonymous_namespace_p): Ignore TREE_PUBLIC
+	on builtin types.
+	* ipa-devirt.c: Include stor-layout.h and intl.h
+	(odr_subtypes_equivalent_p): New function.
+	(warn_odr): New function.
+	(warn_type_mismatch): New function.
+	(odr_types_equivalent_p): New function.
+	(add_type_duplicate): Use it.
+	* common.opt (Wodr): New flag.
+	* doc/invoke.texi (Wodr): Document new warning.
+
+2014-07-12  Jan Hubicka  <hubicka@ucw.cz>
+
 	* timevar.def (TV_IPA_LTO_DECL_INIT_IO): Remove.
 	(TV_IPA_LTO_CTORS_IN, TV_IPA_LTO_CTORS_OUT): New timevar.
 	* cgraph.c (cgraph_get_body): Push GIMPLE_IN timevar.

gcc/common.opt

@@ -587,6 +587,10 @@ Warn if the loop cannot be optimized due to nontrivial assumptions.
 Wmissing-noreturn
 Common Alias(Wsuggest-attribute=noreturn)
 
+Wodr
+Common Warning
+Warn about some C++ One Definition Rule violations during link time optimization
+
 Woverflow
 Common Var(warn_overflow) Init(1) Warning
 Warn about overflow in arithmetic expressions

gcc/doc/invoke.texi

@@ -260,7 +260,7 @@ Objective-C and Objective-C++ Dialects}.
 -Wlogical-op -Wlogical-not-parentheses -Wlong-long @gol
 -Wmain -Wmaybe-uninitialized -Wmissing-braces  -Wmissing-field-initializers @gol
 -Wmissing-include-dirs @gol
--Wno-multichar  -Wnonnull  -Wno-overflow -Wopenmp-simd @gol
+-Wno-multichar  -Wnonnull  -Wodr  -Wno-overflow  -Wopenmp-simd @gol
 -Woverlength-strings  -Wpacked  -Wpacked-bitfield-compat  -Wpadded @gol
 -Wparentheses  -Wpedantic-ms-format -Wno-pedantic-ms-format @gol
 -Wpointer-arith  -Wno-pointer-to-int-cast @gol
@@ -4915,6 +4915,12 @@ attribute.
 @opindex Woverflow
 Do not warn about compile-time overflow in constant expressions.
 
+@opindex Wodr
+@opindex Wno-odr
+@opindex Wodr
+Warn about One Definition Rule violations during link time optimization.
+Require @option{-flto-odr-type-merging} to be enabled. Enabled by default
+
 @item -Wopenmp-simd
 @opindex Wopenm-simd
 Warn if the vectorizer cost model overrides the OpenMP or the Cilk Plus

gcc/tree.c

@@ -11864,6 +11864,10 @@ obj_type_ref_class (tree ref)
 bool
 type_in_anonymous_namespace_p (const_tree t)
 {
+  /* TREE_PUBLIC of TYPE_STUB_DECL may not be properly set for
+     bulitin types; those have CONTEXT NULL.  */
+  if (!TYPE_CONTEXT (t))
+    return false;
   return (TYPE_STUB_DECL (t) && !TREE_PUBLIC (TYPE_STUB_DECL (t)));
 }