[Buildroot] [PATCH] systemd: Build with LTO
Thomas Petazzoni
thomas.petazzoni at bootlin.com
Tue Oct 9 19:49:12 UTC 2018
Hello,
On Tue, 9 Oct 2018 22:33:40 +0300, Alexey Brodkin wrote:
> diff --git a/package/systemd/systemd.mk b/package/systemd/systemd.mk
> index 4813496670..ebd29c89b0 100644
> --- a/package/systemd/systemd.mk
> +++ b/package/systemd/systemd.mk
> @@ -38,7 +38,8 @@ SYSTEMD_CONF_OPTS += \
> -Dsulogin-path=/usr/sbin/sulogin \
> -Dmount-path=/usr/bin/mount \
> -Dumount-path=/usr/bin/umount \
> - -Dnobody-group=nogroup
> + -Dnobody-group=nogroup \
> + -Db_lto=true
I don't think we can do this unconditionally. We have a bunch of
options such as BR2_BINUTILS_ENABLE_LTO and BR2_GCC_ENABLE_LTO to
enable LTO support in the internal toolchain, and we don't today have a
way to know if the external toolchain provided supports LTO or not.
So this needs a much more generic solution:
- A global Config.in option to enable/disable usage of LTO. It will
have to interact with the toolchain LTO support.
- An option that tells whether the toolchain supports LTO. For
internal toolchains, it's simply selected by BR2_GCC_ENABLE_LTO. For
external toolchains, we need a check to verify that the toolchain is
LTO + a visible option for custom external toolchains.
So: yes for using LTO, but we need something more generic.
Best regards,
Thomas
--
Thomas Petazzoni, CTO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
More information about the buildroot
mailing list