Function cus__merging_cu() is introduced in Commit 39227909db3c
("dwarf_loader: Permit merging all DWARF CU's for clang LTO built
binary") to test whether cross-cu references may happen.
The original implementation anticipates compilation flags
in dwarf, but later some concerns about binary size surfaced
and the decision is to scan .debug_abbrev as a faster way
to check cross-cu references. Also putting a note in vmlinux
to indicate whether lto is enabled for built or not can
provide a much faster way.
This patch set implemented this two approaches, first
checking the note (in Patch #2), if not found, then
check .debug_abbrev (in Patch #1).
Yonghong Song (2):
dwarf_loader: check .debug_abbrev for cross-cu references
dwarf_loader: check .notes section for lto build info
dwarf_loader.c | 76 ++++++++++++++++++++++++++++++++++++--------------
1 file changed, 55 insertions(+), 21 deletions(-)
--
2.30.2
