Rather than setting them in the build profile, just set them in etc/defaults.conf (overridable via etc/conf) to simplify the code. - Also enable _FORTIFY_SOURCE=2 in CPPFLAGS. - Also enable -z,relro in LDFLAGS. As suggested by @chneukirchen.
- updated binutils to 2.25 - updated gcc to 4.9.2 - updated musl to 1.1.6 - updated linux headers to 3.18.5