tree 5d2bbcee39b8adff66ac767d8bde1bcb6283dfe7
parent f872685c87f27d290a01b4c9fc976298742b9a5c
author Marek Behún <marek.behun@nic.cz> 1621509843 +0200
committer Tom Rini <trini@konsulko.com> 1621880490 -0400

build: support building with Link Time Optimizations

Add plumbing for building U-Boot with Link Time Optimizations.

When building with LTO, $(PLATFORM_LIBS) has to be in --whole-archive /
--no-whole-archive group, otherwise some functions declared in assembly
may not be resolved and linking may fail.

Note: clang may throw away linker list symbols it thinks are unused when
compiling with LTO. To force these symbols to be included, we refer to
them via the __ADDRESSABLE macro in a C file generated from compiled
built-in.o files before linking.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Reviewed-by: Simon Glass <sjg@chromium.org>