The patch in revision 113012 broke reference counting. It adds this:
+ /* Set the string's refcount to 0 so that prune_unused_types_mark
+ accounts properly for it. */
+ if (AT_class (a) == dw_val_class_str)
+ a->dw_attr_val.v.val_str->refcount = 0;
But something in this patch causes this to trigger for the strings attached to
the compilation unit DIE, and nothing ever increments them again.
prune_unused_types_update_strings is never called for the compilation unit. I
think this is because prune_unused_types_prune only calls it for children of
the current DIE.
Things were fine in 4.1.
--
Summary: [4.2 regression] Dwarf no longer uses merged strings for
DW_AT_comp_dir
Product: gcc
Version: 4.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: drow at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28063
