PR c++/41090

	Add -fdeclone-ctor-dtor.
gcc/cp/
	* optimize.c (can_alias_cdtor, populate_clone_array): Split out
	from maybe_clone_body.
	(maybe_thunk_body): New function.
	(maybe_clone_body): Call it.
	* mangle.c (write_mangled_name): Remove code to suppress
	writing of mangled name for cloned constructor or destructor.
	(write_special_name_constructor): Handle decloned constructor.
	(write_special_name_destructor): Handle decloned destructor.
	* method.c (trivial_fn_p): Handle decloning.
	* semantics.c (expand_or_defer_fn_1): Clone after setting linkage.
gcc/c-family/
	* c.opt: Add -fdeclone-ctor-dtor.
	* c-opts.c (c_common_post_options): Default to on iff -Os.
gcc/
	* cgraph.h (struct cgraph_node): Add calls_comdat_local.
	(symtab_comdat_local_p, symtab_in_same_comdat_p): New.
	* cif-code.def: Add USES_COMDAT_LOCAL.
	* symtab.c (verify_symtab_base): Make sure we don't refer to a
	comdat-local symbol from outside its comdat.
	* cgraph.c (verify_cgraph_node): Likewise.
	* cgraphunit.c (mark_functions_to_output): Don't mark comdat-locals.
	* ipa.c (symtab_remove_unreachable_nodes): Likewise.
	(function_and_variable_visibility): Handle comdat-local fns.
	* ipa-cp.c (determine_versionability): Don't clone comdat-locals.
	* ipa-inline-analysis.c (compute_inline_parameters): Update
	calls_comdat_local.
	* ipa-inline-transform.c (inline_call): Likewise.
	(save_inline_function_body): Don't clear DECL_COMDAT_GROUP.
	* ipa-inline.c (can_inline_edge_p): Check calls_comdat_local.
	* lto-cgraph.c (input_overwrite_node): Read calls_comdat_local.
	(lto_output_node): Write it.
	* symtab.c (symtab_dissolve_same_comdat_group_list): Clear
	DECL_COMDAT_GROUP for comdat-locals.
include/
	* demangle.h (enum gnu_v3_ctor_kinds):
	Added literal gnu_v3_unified_ctor.
	(enum gnu_v3_ctor_kinds):
	Added literal gnu_v3_unified_dtor.
libiberty/
	* cp-demangle.c (cplus_demangle_fill_ctor,cplus_demangle_fill_dtor):
	Handle unified ctor/dtor.
	(d_ctor_dtor_name): Handle unified ctor/dtor.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@206182 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 23 insertions, 0 deletions

diff --git a/gcc/symtab.c b/gcc/symtab.c
index dc700e7c735..8d36cae7b27 100644
--- a/gcc/symtab.c
+++ b/gcc/symtab.c
@@ -538,6 +538,10 @@ symtab_dissolve_same_comdat_group_list (symtab_node *node)
     {
       next = n->same_comdat_group;
       n->same_comdat_group = NULL;
+      /* Clear DECL_COMDAT_GROUP for comdat locals, since
+         make_decl_local doesn't.  */
+      if (!TREE_PUBLIC (n->decl))
+	DECL_COMDAT_GROUP (n->decl) = NULL_TREE;
       n = next;
     }
   while (n != node);
@@ -844,6 +848,21 @@ verify_symtab_base (symtab_node *node)
 	  n = n->same_comdat_group;
 	}
       while (n != node);
+      if (symtab_comdat_local_p (node))
+	{
+	  struct ipa_ref_list *refs = &node->ref_list;
+	  struct ipa_ref *ref;
+	  for (int i = 0; ipa_ref_list_referring_iterate (refs, i, ref); ++i)
+	    {
+	      if (!symtab_in_same_comdat_p (ref->referring, node))
+		{
+		  error ("comdat-local symbol referred to by %s outside its "
+			 "comdat",
+			 identifier_to_locale (ref->referring->name()));
+		  error_found = true;
+		}
+	    }
+	}
     }
   return error_found;
 }
@@ -911,6 +930,10 @@ symtab_make_decl_local (tree decl)
 {
   rtx rtl, symbol;
 
+  /* Avoid clearing DECL_COMDAT_GROUP on comdat-local decls.  */
+  if (TREE_PUBLIC (decl) == 0)
+    return;
+
   if (TREE_CODE (decl) == VAR_DECL)
     DECL_COMMON (decl) = 0;
   else gcc_assert (TREE_CODE (decl) == FUNCTION_DECL);