Enable link-time optimization

Packages describing “lto” as local USE flag

Package “lto” Flag Description
games-action/prismlauncher Enable link-time optimization
net-irc/ircii Build using Link Time Optimizations (LTO)
dev-lang/rust Optimize the build using Link Time Optimization (LTO)
dev-lang/spidermonkey Enable Link Time Optimization (LTO)
app-admin/clsync Build with link time optimization (LTO).
net-analyzer/netdata Build with Link Time Optimization (LTO)
app-editors/neovim Build with Link Time Optimization (LTO)
app-containers/lxc Enable Link Time Optimization (LTO)
dev-lang/python Optimize the build using Link Time Optimization (LTO)
www-client/chromium Build with Link Time Optimizations (via clang's ThinLTO)
media-sound/ncmpcpp Build with link-time optimisation
dev-lang/R Use link-time optimization for R and its recommended packages.
www-client/seamonkey Enable Link Time Optimization (LTO). Requires Gold linker
dev-lang/gnat-gpl Build using Link Time Optimizations (LTO)
app-admin/sysstat Build using Link Time Optimizations (LTO)
dev-libs/pocl Adds support for link time optimization
net-analyzer/wireshark Enable link time optimization
net-analyzer/icinga2 Adds support for link time optimization
sys-fs/e2fsprogs Build with link time optimization (LTO)
media-libs/opencv Build using Link Time Optimizations (LTO)
sys-devel/gcc Build using Link Time Optimizations (LTO). Note that GCC is always built with support for building other programs with LTO. This USE flag is for whether GCC itself is built and optimized with LTO.
app-text/crengine-ng Use link time optimization
app-mobilephone/scrcpy Build with Link Time Optimization (LTO)
dev-cpp/benchmark Optimize the build using Link Time Optimization (LTO)
net-misc/networkmanager Build using Link Time Optimizations (LTO)
media-gfx/darktable Enable link-time optimisations in the RawSpeed library
www-client/firefox Enable Link Time Optimization (LTO)
net-libs/nodejs Build with link-time optimisation
sys-devel/binutils-apple Add support for Link-Time Optimization with LLVM
dev-java/openjdk Enable Link Time Optimization (LTO)
dev-db/mongodb Adds support for link time optimization
mail-client/thunderbird Enable Link Time Optimization (LTO)

All packages providing a “lto” USE flag (27)