Bug 28573

Summary:	Provide an dwarf_begin interface to open (single-file) DWO or GNU_LTO Dwarf subset
Product:	elfutils	Reporter:	Mark Wielaard <mark>
Component:	libdw	Assignee:	Not yet assigned to anyone <unassigned>
Status:	NEW ---
Severity:	normal	CC:	elfutils-devel
Priority:	P2
Version:	unspecified
Target Milestone:	---
Host:		Target:
Build:		Last reconfirmed:

Description Mark Wielaard 2021-11-09 18:13:41 UTC

To fix https://sourceware.org/bugzilla/show_bug.cgi?id=27367 "invalid loclists data with -ffat-lto-objects" dwarf_begin_elf now checks to see which DWARF subset is in the debug ELF file. And it picks the "plain" (.debug sections) over "dwo" (.debug_...dwo sections) over "lto" (.gnu.debuglto_.debug sections) in case multiple are in the same file. We have to pick one because mixing the sections causes chaos.

But the user might want to pick a different set. In particular the user might want to pick "single file" DWO (where the .dwo sections are in the same file as the skeleton plain debug sections).

So we want to have a dwarf_begin variant with a flag to pick such a subset.