In Gentoo, the openoffice ebuild has - 

filter-flags "-funroll-loops"
	filter-flags "-fprefetch-loop-arrays"
	filter-flags "-fno-default-inline"
	filter-flags "-ftracer"
	filter-flags "-fforce-addr"

	filter-flags "-O[s2-9]"

	if [[ $(gcc-major-version) -lt 4 ]]; then
		filter-flags "-fstack-protector"
		filter-flags "-fstack-protector-all"
		replace-flags "-fomit-frame-pointer" "-momit-leaf-frame-pointer"
	fi

Thus, the current build system of openoffice is considered terrible, a havoc and
infamous among the Gentoo community. It's time it changes. This even does not
allow standard O2 optimization otherwise compile time failures arise.

A good idea will be to split this one large tarball into small ones.