This patch set is a subset of the GNAT patches I've maintained
separately for a few years.  I have limited it adding support for
x86-64-*-dragonfly* and improving support for i[34567]86-*-freebsd and
x86_64-*-freebsd*.

In some cases of pre-processor macros, they may contain additions for
NetBSD and OpenBSD.  GNAT does not officially support these platforms,
so technically they are no-ops.  However, GNAT is buildable in OpenBSD
ports, and in NetBSD's pkgsrc.  Since I'm modifying the lines anyway and
I already know they are required for NetBSD and OpenBSD, I'm adding them
at the same time to reduce diffs elsewhere.  I am only doing this when I
touch the line for other reasons involving FreeBSD and DragonFly BSD.

I've added the attached patch to the gcc trunk as it was on May 29,
built GNAT and ran the testsuite.  The results are linked here:

1. http://leaf.dragonflybsd.org/~marino/freebsd/dfly64.concise.log.txt
2. http://leaf.dragonflybsd.org/~marino/freebsd/fbsd64.concise.log.txt
3. http://leaf.dragonflybsd.org/~marino/freebsd/fbsd32.concise.log.txt

There is one regression in the gnat.dg tests on all platforms, but I
believe this is caused by recent commits to GNAT and not by these patches.

Note 1)  All TOOL_TARGET_PAIRS in gcc/ada/gcc-interface/Makefile.in
should be removed for most (if not all) platforms as they were moved to
gnattools/configure and are now no-ops.  However, for this patch set I
only removed them for FreeBSD.

Note 2) I removed reference to FreeBSD 6 and earlier.  These platforms
have been EOL for years (FreeBSD 8 is EOL in 4 weeks)

Note 3) FreeBSD should have switched to use errno years ago, this patch
does that now.

Note 4) For all BSD except DragonFly (which doesn't support i386
anymore), the GCC_UNWINDER is specified for i386 platforms.  It wasn't
specified before.

Note 5) All the ce/cxa/cxg tests that failed on i386-FreeBSD are related
to the 53-bit float mantissa issue on FreeBSD.  This is resolved by my
GNAT-AUX repository changes so the tests pass without compromising other
compilers, but those patches are out of scope of this set.

copy of patch:
http://leaf.dragonflybsd.org/~marino/freebsd/gnat-dragonfly-support.diff
copy of suggested commit message:
http://leaf.dragonflybsd.org/~marino/freebsd/gnat-dragonfly-support.msg.txt
(both attached to this email)

Also, my FSF copyright assignment is in order and on file at FSF.
Thank you for reviewing this!

John