[PATCH u-boot v4 14/36] build: support building with Link Time Optimizations
sjg at chromium.org
Thu May 20 19:51:54 CEST 2021
On Thu, 20 May 2021 at 05:25, Marek Behún <marek.behun at nic.cz> wrote:
> 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 at nic.cz>
> Kbuild | 2 +
> Kconfig | 24 ++++++++++
> Makefile | 67 ++++++++++++++++++++++++++-
> scripts/Makefile.lib | 3 ++
> scripts/Makefile.spl | 44 +++++++++++++++++-
> scripts/gen_ll_addressable_symbols.sh | 12 +++++
That is very long. How about gen_linkerlist_syms.sh ?
> 6 files changed, 149 insertions(+), 3 deletions(-)
> create mode 100755 scripts/gen_ll_addressable_symbols.sh
Reviewed-by: Simon Glass <sjg at chromium.org>
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