Disclaimer: this bug has been filed in a semi-automated manner.
When emerging the package dev-util/valgrind-3.7.0-r4, the following elog messages are displayed:
* Valgrind will not work if glibc does not have debug symbols.
* To fix this you can add splitdebug to FEATURES in make.conf
* and remerge glibc. See:
Such messages should only be displayed when the package is a new install.
These situations can be checked in the ebuild as follows:
if ! has_version 'dev-util/valgrind'; then
See the tracker bug 440214 for more details.
I'm not sure this is such a good idea. I don't see a problem with repeating this message each time you install valgrind.