Created attachment 385974 [details] build.log.gz Looks like their "Makedefs" file includes a .SILENT: line. I'm not sure if there is a way to override that, but it should be easy enough to sed out.
Thanks for the info. This is now resolved in all ebuilds starting with version 1.7.5-r1 or newer. *cups-1.7.5-r1 (15 Oct 2014) *cups-2.0.0 (15 Oct 2014) 15 Oct 2014; Matthias Maier <tamiko@gentoo.org> +cups-1.7.5-r1.ebuild, +cups-2.0.0.ebuild, cups-1.7.9999.ebuild: revbump; verbose build log and use correct compiler (bug 524338 524340); also fix 1.7* live ebuild