Adds support for link time optimization

Packages describing “lto” as local USE flag

Package “lto” Flag Description
dev-db/mongodb Adds support for link time optimization
media-gfx/darktable Enable link-time optimisations in the RawSpeed library
www-client/chromium Build with Link Time Optimizations (via clang's ThinLTO)
media-sound/ncmpcpp Build with link-time optimisation
app-editors/neovim Build with Link Time Optimization (LTO)
dev-lang/gnat-gpl Build using Link Time Optimizations (LTO)
dev-lang/python Optimize the build using Link Time Optimization (LTO)
dev-lang/R Use link-time optimization for R and its recommended packages.
dev-lang/spidermonkey Enable Link Time Optimization (LTO)
games-action/polymc Enable link-time optimization
games-engines/devilutionx Build with link time optimization enabled
sys-devel/gcc Build using Link Time Optimizations (LTO)
mail-client/thunderbird Enable Link Time Optimization (LTO). Requires Gold linker when using GCC or LDD linker when using Clang
app-admin/clsync Build with link time optimization (LTO).
media-libs/opencv Build using Link Time Optimizations (LTO)
net-analyzer/icinga2 Adds support for link time optimization
games-emulation/dolphin Add support for link-time optimizations.
dev-cpp/benchmark Optimize the build using Link Time Optimization (LTO)
net-analyzer/wireshark Enable link time optimization
net-libs/nodejs Build with link-time optimisation
net-analyzer/netdata Build with Link Time Optimization (LTO)
net-misc/networkmanager Build using Link Time Optimizations (LTO)
sys-fs/e2fsprogs Build with link time optimization (LTO)
www-client/firefox Enable Link Time Optimization (LTO)Uses BFD linker with GCC and LLD linker with Clang
sys-devel/binutils-apple Add support for Link-Time Optimization with LLVM
www-client/seamonkey Enable Link Time Optimization (LTO). Requires Gold linker

All packages providing a “lto” USE flag (22)