Add support for profile-guided optimization using gcc-4.5, for faster binaries. This option will double the compile time.

Packages describing “pgo” as local USE flag

Package “pgo” Flag Description
mail-client/thunderbird Add support for profile-guided optimization using gcc-4.5, for faster binaries. This option will double the compile time.
dev-lang/erlang Build erts with profile-guided optimizations
www-client/firefox Add support for profile-guided optimization using gcc-4.5, for faster binaries. This option will double the compile time.
dev-lang/gnat-gpl Build GCC using Profile Guided Optimization (PGO)
sys-devel/gcc Build GCC using Profile Guided Optimization (PGO)

All packages providing a “pgo” USE flag (4)