Hi Tom,
On Wed, 3 Aug 2022 at 12:13, Simon Glass sjg@chromium.org wrote:
LTO (Link-Time Optimisation) is an very useful feature which can significantly reduce the size of U-Boot binaries. So far it has been made available for selected ARM boards and sandbox.
However, incremental builds are much slower when LTO is used. For example, an incremental build of sandbox takes 2.1 seconds on my machine, but 6.7 seconds with LTO enabled.
Add a NO_LTO parameter to the build, similar to NO_SDL, so it can be disabled during development if needed, for faster builds.
Add some documentation about LTO while we are here.
Signed-off-by: Simon Glass sjg@chromium.org
Changes in v3:
- Rework to operate like the NO_SDL flag
Makefile | 17 ++++++++++++----- arch/arm/config.mk | 4 ++-- arch/arm/include/asm/global_data.h | 2 +- doc/build/gcc.rst | 17 +++++++++++++++++ scripts/Makefile.spl | 2 +- 5 files changed, 33 insertions(+), 9 deletions(-)
Any word on this patch and the next one, please?
Regards, Simon