Enable link time optimization

Packages describing “lto” as local USE flag

Package “lto” Flag Description
net-analyzer/wireshark Enable link time optimization
net-im/telegram-desktop Enable Link Time Optimization (LTO / IPO)
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
media-gfx/darktable Enable link-time optimisations in the RawSpeed library
net-analyzer/icinga2 Adds support for link time optimization
app-editors/neovim Build with Link Time Optimization (LTO)
dev-db/mongodb Adds support for link time optimization
dev-lang/spidermonkey Enable Link Time Optimization (LTO)
games-emulation/dolphin Add support for link-time optimizations.
games-engines/devilutionx Build with link time optimization enabled
media-libs/opencv Build using Link Time Optimizations (LTO)
net-analyzer/netdata Build with Link Time Optimization (LTO)
net-misc/networkmanager Link-time optimization
sys-devel/binutils-apple Add support for Link-Time Optimization with LLVM
www-client/firefox Enable Link Time Optimization (LTO). Requires Gold linker when using GCC or LDD linker when using Clang

All packages providing a “lto” USE flag (14)