valgrind needs debug symbols for libdl Reproducible: Always Steps to Reproduce: Fix: emerge glibc with FEATURES="splitdebug" Suggest a note for valgrind recommending this.
It's already there: ewarn "Valgrind will not work on ppc, ppc64 or amd64 if glibc does not have" ewarn "debug symbols (see https://bugs.gentoo.org/show_bug.cgi?id=214065" ewarn "and http://bugs.gentoo.org/show_bug.cgi?id=274771)." ewarn "To fix this you can add splitdebug to FEATURES in make.conf and" ewarn "remerge glibc."