makefiles: Avoid generating the .tab.c file twice with bison.

tools/makedep.c

@@ -2680,20 +2680,17 @@ static void output_po_files( struct makefile *make )
  */
 static void output_source_y( struct makefile *make, struct incl_file *source, const char *obj )
 {
-    /* add source file dependency for parallel makes */
     char *header = strmake( "%s.tab.h", obj );
 
     if (find_include_file( make, header ))
     {
         output( "%s: %s\n", obj_dir_path( make, header ), source->filename );
-        output( "\t%s%s -o %s.tab.c -d %s\n",
-                cmd_prefix( "BISON" ), bison, obj_dir_path( make, obj ), source->filename );
-        output( "%s.tab.c: %s %s\n", obj_dir_path( make, obj ),
-                source->filename, obj_dir_path( make, header ));
+        output( "\t%s%s -o %s.tab.$$$$.c --header=$@ %s && rm -f %s.tab.$$$$.c\n",
+                cmd_prefix( "BISON" ), bison, obj_dir_path( make, obj ),
+                source->filename, obj_dir_path( make, obj ));
         strarray_add( &make->clean_files, header );
     }
-    else output( "%s.tab.c: %s\n", obj_dir_path( make, obj ), source->filename );
-
+    output( "%s.tab.c: %s\n", obj_dir_path( make, obj ), source->filename );
     output( "\t%s%s -o $@ %s\n", cmd_prefix( "BISON" ), bison, source->filename );
 }