Re: [Buildroot] [PATCH 1/5] Config.in: add new option BR2_ENABLE_LTO to globally enable LTO

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

On Mon, 25 Jul 2022 17:22:25 +0200
"Arnout Vandecappelle (Essensium/Mind)" <arnout@mind.be> wrote:

> Some packages have a configure option to enable LTO. Add a global option
> to enable/disable this in packages.
> 
> Note that we could instead (or in addition) pass -flto directly to the
> compiler in the toolchain wrapper, but that has a *much* bigger impact,
> so for the time being let's not do that.
> 
> No toolchain dependency is added for this, because all toolchains now
> support LTO.
> - LTO support was merged in GCC years before 4.6 (our minimal version)
>   was released.
> - Our oldest external toolchain, Sourcery ARM 2014.05, has LTO support.
> - For our internal toolchains, it is supposedly regulated by
>   BR2_GCC_ENABLE_LTO. However, that option only *enables* it - it
>   doesn't disable LTO support when it's not provided. Since LTO support
>   defaults to enabled for a long time already in GCC, in practice all
>   Buildroot-generated toolchains do support LTO.
> 
> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
> ---
>  Config.in | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)

Series applied, thanks!

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
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