[gcc r12-2616] d: Use Identifier::idPool to generate anonymous field name.

[gcc r12-2616] d: Use Identifier::idPool to generate anonymous field name.

[Iain Buclaw]

https://gcc.gnu.org/g:3b52a1086c1358a7694ebe0c7610058c48e93b22

commit r12-2616-g3b52a1086c1358a7694ebe0c7610058c48e93b22
Author: Iain Buclaw <ibuclaw@gdcproject.org>
Date:   Mon Jul 26 18:06:03 2021 +0200

    d: Use Identifier::idPool to generate anonymous field name.
    
    The self-hosted implementation of the D front-end does not export
    Identifier::generateId, so handle name generation inline instead.
    
    gcc/d/ChangeLog:
    
            * d-builtins.cc (build_frontend_type): Use Identifier::idPool to
            generate anonymous field name.

Diff:
---
 gcc/d/d-builtins.cc | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/gcc/d/d-builtins.cc b/gcc/d/d-builtins.cc
index 9db46c0c5ca..328711fc745 100644
--- a/gcc/d/d-builtins.cc
+++ b/gcc/d/d-builtins.cc
@@ -241,8 +241,8 @@ build_frontend_type (tree type)
       sdecl->type->merge2 ();
 
       /* Add both named and anonymous fields as members of the struct.
-	 Anonymous fields still need a name in D, so call them "__pad%d".  */
-      int anonfield_id = 0;
+	 Anonymous fields still need a name in D, so call them "__pad%u".  */
+      unsigned anonfield_id = 0;
       sdecl->members = new Dsymbols;
 
       for (tree field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
@@ -259,7 +259,11 @@ build_frontend_type (tree type)
 
 	  Identifier *fident;
 	  if (DECL_NAME (field) == NULL_TREE)
-	    fident = Identifier::generateId ("__pad", anonfield_id++);
+	    {
+	      char name[16];
+	      snprintf (name, sizeof (name), "__pad%u", anonfield_id++);
+	      fident = Identifier::idPool (name);
+	    }
 	  else
 	    {
 	      const char *name = IDENTIFIER_POINTER (DECL_NAME (field));