Created attachment 268439 [details] build.log See summary and to-be-attached build.log as well as ebuild patch which fixes the build for me.
Created attachment 268441 [details] emerge --info
Created attachment 268443 [details, diff] sparse-0.4.3.ebuild-CFLAGS.patch Removes hardcoded -O2 and -g. Preserves hardcoded -finline-functions -fno-strict-aliasing
i went with something slightly different http://sources.gentoo.org/sys-devel/sparse/sparse-0.4.3.ebuild?r1=1.1&r2=1.2 http://sources.gentoo.org/sys-devel/sparse/sparse-9999.ebuild?r1=1.5&r2=1.6