[OpenWrt-Devel] [PATCH 1/4] dnsmasq: Activate LTO

[Jonas Gorski]

On Fri, 1 Nov 2019 at 21:55, Hauke Mehrtens <hauke at hauke-m.de> wrote:
>
> This decreases the binary size when PIE ASLR is activated by 8% on MIPS BE.
>
> old:
> 202,020 /usr/sbin/dnsmasq
>
> new:
> 185,676 /usr/sbin/dnsmasq

Nice reduction.

>
> Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
> ---
>  package/network/services/dnsmasq/Makefile | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/package/network/services/dnsmasq/Makefile b/package/network/services/dnsmasq/Makefile
> index 5c114eb1c6..e86b031e3f 100644
> --- a/package/network/services/dnsmasq/Makefile
> +++ b/package/network/services/dnsmasq/Makefile
> @@ -127,8 +127,8 @@ endef
>  Package/dnsmasq-dhcpv6/conffiles = $(Package/dnsmasq/conffiles)
>  Package/dnsmasq-full/conffiles = $(Package/dnsmasq/conffiles)
>
> -TARGET_CFLAGS += -ffunction-sections -fdata-sections
> -TARGET_LDFLAGS += -Wl,--gc-sections
> +TARGET_CFLAGS += -flto
> +TARGET_LDFLAGS += -flto=jobserver

Maybe add a PKG_LTO (or so) flag packages can set, and add these flags
then automatically? Less code churn per package.


Regards
Jonas

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