[Bug 218206] boot2 fails to compile with xtoolchain-amd64-gcc 6.3.0: negative space left

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218206

--- Comment #1 from Warner Losh <imp at FreeBSD.org> ---
BOOT2SIZE is invariant and cannot be changed. It shall be 7.5k and no larger
since boot2 is installed into a slot that's 7.5k in size. We might be able to
do creative things to mine a few bytes from boot1, but even that's a crap
shoot.

But -1044 bytes free is an epic fail on gcc 6.3's part. Someone will need to
see if there's a magic combination of options that can reduce the size, or it
will be unsupported. That's the harsh reality of living in 7.5k: either it
fits, or it's broken. gcc 4.2.1 has +204 bytes free today. Even the
bloat-generating clang has 100 bytes free.

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