libressl-portable/portable — pull request #53 by jbarlow83 (2014-12-30 23:16:36+00:00)
Title: Turn on memory corruption hardening where available

Many compilers enable some kind of hardening by default, but this is not universally the case, and some more aggressive options are not always enabled.

There may be a performance impact to -fstack-protector-all by default, but Chromium uses this option when -fstack-protector-strong is not available, and I think that is appropriate for a critical security component.