Just to be clear, there's no hardware deprecation that this patch introduces.

In D57388#1315016, @adrian wrote:

ok, the hardware deprecation is more important. you should have mentioned that in your commit message :-)

So what's the minimum that ppc64le will support with this change? POWER7?

What's the motivation for this change?

Bump FREEBSD_CC_VERSION, the compiler must be first bootstrapped to
build with IEEE-754 binary128 support enabled.

In D57388#1314937, @ivy wrote:

i appreciate that powerpc64 is a tier 2 port, but even so, i'm a little unsure about breaking ABI compatibility like this. do we have any idea how widespread use of long double is?

In D57388#1314909, @adrian wrote:

(a) ouch, a flag day for ports heh
(b) what should we do for powerpc bigendian? What's the plus/minus flipping it there too?

Basically dropping support for anything below POWER7. IEEE long double is implemented using VSX instructions, so at least using long double on pre-POWER7 will result with SIGILL.

(c) I'm ok with this, I think we just need to give people a weeks warning on -ppc so they know what's coming.

OK, I'll write a mail later.

The clang part will be upstreamed once this patch will go in here.
I just don't want to push that change to upstream before it goes in
here.
compiler-rt part can't be upstreamed, because this is a hack -
compiler-rt does not support kf type ldbl functions that powerpc64le
needs. Upstream usually just uses libgcc (from GCC) for that.

Correct _GCC_VERSION usage.