[arch-dev-public] RFC: Build using LTO by default

[Allan McRae]

Hi,

When pacman-6.0 is release, makepkg will provide the option to build
packages using Link Time Optimisation (LTO) by default.  This provides
smaller, faster executables/DSOs, and improves GCC diagnostics.  SUSE
saw an average 5% decrease in binary size.


In short, makepkg.conf will have:
OPTIONS=(.... lto)

When enabled, makepkg with add -flto to CFLAGS/CXXFLAGS

The use of LTO can be disabled as needed in a PKGBUILD:
options=('!lto')


For full details and to comment, see:
https://gitlab.archlinux.org/archlinux/rfcs/-/merge_requests/4

Allan