2022-03-03

libbacktrace: gather address ranges from skeleton units

	* dwarf.c (find_address_ranges): Handle skeleton units.
	(read_function_entry): Likewise.

2021-10-29

config/override.m4: don't require exactly autoconf 2.69

Fixes #71
Fixes #74

2020-01-03

libbacktrace: update to current version from GCC trunk

This adds DWARF 5 support as well as an enhanced testsuite.

Patch assembled by Than McIntosh.