[Bug 265181] Clang doesn't properly report the C++ error when float is used as an argument in bit-wise operators (only on armv6 some error is reported instead of reporting it on all architectures)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265181

--- Comment #8 from Warner Losh <imp@FreeBSD.org> ---
Ah, the bswap32, bswap_32, etc fiasco.

There's three or four different standards.

And I'm trying to iron it all out. Everywhere, though, __bswap32, etc, should
be defined as __builtin_bswap32, etc. Anything else will be suboptimal.

I started to sort all this out in
https://reviews.freebsd.org/D31964 (where I start to use __ versions
everywhere)
https://reviews.freebsd.org/D31962 (this is almost ready to go in, but there's
a couple of stragglers in ports that I've not had the time to fix)

The problem is that endian.h, sys/endian.h and byteswap.h are different APIs
that vary a bit, that also has a number of different autoconf and autoconf-like
scripts that have various different bugs that get it wrong, or detect things to
include in one way, and detect which macros to use in a different way and this
mismatch causes problems.

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