widl: Guard against re-import of the main input file.

tools/widl/parser.l

@@ -520,6 +520,7 @@ void push_import( const char *import_name, struct location *where )
 
     LIST_FOR_EACH_ENTRY( import, &imports, struct import, entry )
         if (!strcmp( import->name, import_name )) return;  /* already imported */
+    if (!strcmp( idl_name, import_name )) return;  /* already imported */
 
     import = xmalloc( sizeof(struct import) );
     import->name = xstrdup( import_name );

tools/widl/parser.y

@@ -2270,7 +2270,7 @@ char *gen_name(void)
 
   if (! file_id)
   {
-    char *dst = replace_extension( get_basename(input_idl_name), ".idl", "" );
+    char *dst = replace_extension( idl_name, ".idl", "" );
     file_id = dst;
 
     for (; *dst; ++dst)

tools/widl/widl.c

@@ -114,7 +114,7 @@ static int stdinc = 1;
 static enum stub_mode stub_mode = MODE_Os;
 
 char *input_name;
-char *input_idl_name;
+char *idl_name;
 char *acf_name;
 char *header_name;
 char *local_stubs_name;
@@ -435,7 +435,7 @@ void write_id_data(const statement_list_t *stmts)
   }
 
   fprintf(idfile, "/*** Autogenerated by WIDL %s ", PACKAGE_VERSION);
-  fprintf(idfile, "from %s - Do not edit ***/\n\n", input_idl_name);
+  fprintf(idfile, "from %s - Do not edit ***/\n\n", idl_name);
   fprintf(idfile, "#include <rpc.h>\n");
   fprintf(idfile, "#include <rpcndr.h>\n\n");
 
@@ -782,7 +782,10 @@ int main(int argc,char *argv[])
       return 1;
     }
     else
-      input_idl_name = input_name = xstrdup(files.str[0]);
+    {
+      input_name = xstrdup( files.str[0] );
+      idl_name = get_basename( input_name );
+    }
   }
   else {
     fprintf(stderr, "%s", usage);

tools/widl/widl.h

@@ -52,7 +52,7 @@ extern int winrt_mode;
 extern int use_abi_namespace;
 
 extern char *input_name;
-extern char *input_idl_name;
+extern char *idl_name;
 extern char *acf_name;
 extern char *header_name;
 extern char *header_token;