Disclaimer: this bug has been filed in a semi-automated manner. When emerging the package dev-lang/tcl-8.5.10-r1, the following elog messages are displayed: * PLEASE NOTE: You are compiling tcl-8.5.10 with * threading enabled. * Threading is not supported by all applications * that compile against tcl. You use threading at * your own discretion. Such messages should only be displayed when the package is a new install, or when the relevant USE flag is not enabled in the current installed version. These situations can be checked in the ebuild as follows: if use threads && ! has_version 'dev-lang/tcl[threads]'; then See the tracker bug 440214 for more details.
No, we will always warn to tell people that this is a dangerous thing to do and they should reconsider their decision.