Build log should always be verbose as per talk on dev-ML, please force it until some EAPI includes a fix for this. Other versions might be affected as well. There are some hidden CCLD lines, adding --disable-silent-rules to econf should probably be enough.
Created attachment 320318 [details] gmtk-1.0.6:20120731-123909.log
obsolete by http://git.overlays.gentoo.org/gitweb/?p=proj/portage.git;a=commit;h=1cc39de72ac5311db748341ef9183586556719d9