[PATCH] New lang hook

https://gcc.gnu.org/ml/gcc-patches/2017-11/msg01340.html
	PR c++/82836
	PR c++/82737
	* tree.h (COPY_DECL_RTL): Rename parms for clarity.
	(SET_DECL_ASSEMBLER_NAME): Forward to
	overwrite_decl_assembler_name.
	(COPY_DECL_ASSEMBLER_NAME): Rename parms for clarity.
	(overwrite_decl_assembler_name): Declare.
	* tree.c (overwrite_decl_assembler_name): New.
	* langhooks-def.h (lhd_overwrite_decl_assembler_name): Declare.
	(LANG_HOOKS_OVERWRITE_DECL_ASSEMBLER_NAME): Provide default.
	(LANG_HOOKS_INITIALIZER): Add it.
	* langhooks.h (struct lang_hooks): Add overwrite_decl_assembler_name.
	* langhooks.c (lhd_set_decl_assembler_name): Use
	SET_DECL_ASSEMBLER_NAME.
	(lhd_overwrite_decl_assembler_name): Default implementation.

	PR c++/82836
	PR c++/82737
	* cp-objcp-common.h (LANG_HOOKS_OVERWRITE_DECL_ASSEMBLER_NAME):
	Override.
	* cp-tree.h (overwrite_mangling): Declare.
	* decl2.c (struct mangled_decl_hash): Entries are deletable.
	(overwrite_mangling): New.

	PR c++/82836
	PR c++/82737
	* g++.dg/pr82836.C: New.

From-SVN: r254823

1 files changed, 11 insertions, 0 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index 28e157f..72da683 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -674,6 +674,17 @@ decl_assembler_name (tree decl)
   return DECL_ASSEMBLER_NAME_RAW (decl);
 }
 
+/* The DECL_ASSEMBLER_NAME_RAW of DECL is being explicitly set to NAME
+   (either of which may be NULL).  Inform the FE, if this changes the
+   name.  */
+
+void
+overwrite_decl_assembler_name (tree decl, tree name)
+{
+  if (DECL_ASSEMBLER_NAME_RAW (decl) != name)
+    lang_hooks.overwrite_decl_assembler_name (decl, name);
+}
+
 /* When the target supports COMDAT groups, this indicates which group the
    DECL is associated with.  This can be either an IDENTIFIER_NODE or a
    decl, in which case its DECL_ASSEMBLER_NAME identifies the group.  */