CVS log for src/sys/arch/x86/include/float.h

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Keyword substitution: kv
Default branch: MAIN

{m68k,x86}/float.h: fix cross references

{x86,m68k}/float.h: document LDBL_MIN behavior

It seems that even though both these platforms have 12-byte floats
that are pretty much the same representation and both allegedly
IEEE-compliant, they manifest the top bit of the mantissa and then
differ slightly in the behavior of the extra encodings this permits.

Thanks to riastradh@ for helping sort this out.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

resync from head

Systematically include sys/featuretest.h when _NETBSD_SOURCE is used.
Some are redundant, but make verification with grep much easier.

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD

* Move the definitions for types other than single-precision and double-
  precision back to machine-dependent headers.  C99 has no strict
  requirement which, if any, extended-precision type `long double' must
  match, and even between 80-bit formats there are differences in
  implementation (m68k vs. x86).
* On arm, consider __VFP_FP__.

Rename <sys/float_ieee.h> to <sys/float_ieee754.h>, following libc's
convention for these.

Override LDBL_MIN

PR/3012: Greg A. Woods: Write all float.h files [except the vax of course]
in terms of float_ieee.h

Move some files out of i386 into x86, so that they can be shared with
other ports.