On Fri, Mar 04, 2022 at 08:42:57AM -0700, Simon Glass 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 LTO_BUILD=n parameter to the build, 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 <s...@chromium.org>
We don't need this since you can do: make EXTRA_CFLAGS="-fno-lto" EXTRA_LDFLAGS="-fno-lto" to pass -fno-lto to compile/linking and disable lto and per https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46905 this has been working for some time. Not that you need to respin the series for this. -- Tom
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