tune-*: define more generic DEFAULTTUNE to share feed between machines
* this is mostly for backwards compatibility and to share binary feed
like it was before, but now without missing different -mtune in it
* if you want to build some package with -mtune add something like this
to your distro config
DEFAULTTUNE_qemuarm_pn-openssl = "arm926ejs"
DEFAULTTUNE_qemuarmx_pn-openssl = "xscale"
be aware that if you do this you should do it also for all packages
which depends on openssl because if you dont and you build e.g. dhcp,
then dhcp build for arm926ejs (even with DEFAULTTUNE armv5te) will
depend on openssl with arm926ejs, so dhcp in armv5te feed will be
rebuild after each MACHINE switch.
* cortexm3, cortexr4, iwmmx and ep9312 are using own DEFAULTTUNE because
they define also different -march
* shared feeds are
armv4t: arm920t, arm9tdmi
armv5te: arm926ejs, xscale
armv7a-neon: cortexa8, cortexa9
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
