Enable Link Time Optimization (LTO). Requires Gold linker when using GCC or LDD linker when using Clang

Packages describing “lto” as local USE flag

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

All packages providing a “lto” USE flag (19)