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We want to use -flto=auto in Arch Linux to speed up building, but we can't hardcode it in buildenv/lto.sh because other downstreams might have clang < 13.0.0 which did not recognize -flto=auto as equivalent to -flto=full. Introducing an LTOFLAGS variable to makepkg.conf seems the way to go. Signed-off-by:
Allan McRae <allan@archlinux.org>
e1ce2351