Hi,
extra sanity checking I added while debugging PR 65316 noticed that the
type inheritance graph builder gets confused when one merges unit compiled
with -g -fno-devirtualize and unit compiled with -fdevirtualize.
In the first case there may be a base type lost.
Bootstrapped/regtested x86_64-linux, comitted.
PR ipa/65316
* tree.c (free_lang_data_in_type): Be sure to keep BINFO_VTABLE
when outputting debug.
Index: tree.c
===================================================================
--- tree.c (revision 221223)
+++ tree.c (working copy)
@@ -5081,9 +5081,15 @@ free_lang_data_in_type (tree type)
if (TYPE_BINFO (type))
{
free_lang_data_in_binfo (TYPE_BINFO (type));
+ /* We need to preserve link to bases and virtual table for all
+ polymorphic types to make devirtualization machinery working.
+ Debug output cares only about bases, but output also
+ virtual table pointers so merging of -fdevirtualize and
+ -fno-devirtualize units is easier. */
if ((!BINFO_VTABLE (TYPE_BINFO (type))
|| !flag_devirtualize)
- && (!BINFO_N_BASE_BINFOS (TYPE_BINFO (type))
+ && ((!BINFO_N_BASE_BINFOS (TYPE_BINFO (type))
+ && !BINFO_VTABLE (TYPE_BINFO (type)))
|| debug_info_level != DINFO_LEVEL_NONE))
TYPE_BINFO (type) = NULL;
}
