Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Update the tests for arm and other ports where long double is the same
as double, similar to r178141.

Test wprintf() in addition to printf().

Updates for changes in the way printf() handles hex floating point
numbers.

Make sure we set the locale to "C" when testing thousands' separator
support, rather than just "", which refers to the system default based
on the environment.

Tests for rounding, and for the leading 0's bug.

- Split the printfloat test into 11 individually wrapped and packaged
tests. (Buy 10, get one free!) The separate categories were
already there; they just weren't labeled.
- Use fesetround() instead of fpsetround(), since the former is
standard and implemented on all supported architectures. Add
tests for each rounding mode.
- Add additional tests for subnormals.

Some of these tests won't pass until problems in vendor sources
(gdtoa and gcc) are fixed and new versions imported, but I
want to get these changes into the tree before I accidentally
blow them away.

Switch over to a different, more flexible test output protocol that's
understood by Perl's Test::Harness module and prove(1) commands.

Update README to describe the new protocol. The work's broken down into
two main sets of changes.

First, update the existing test programs (shell scripts and C programs)
to produce output in the ok/not ok format, and to, where possible, also
produce a header describing the number of tests that are expected to be
run.

Second, provide the .t files that actually run the tests. In some cases
these are copies of, or very similar too, scripts that already existed.
I've kept the old scripts around so that it's possible to verify that
behaviour under this new system (in terms of whether or not a test fails)
is identical to the behaviour under the old system.

Add a TODO file.

Add a regression test for floating-point output in the Greek locale.
See revision 1.3 of src/share/numericdef/el_GR.ISO8859-7.src

Reviewed by: das (a while ago)

Add regression tests for printf's %a/%A formats.

While here, disable some of the long double tests on i386, since
FreeBSD/i386 is the only port that doesn't evaluate long doubles in
their full precision (due to constant folding bugs in gcc).

Add a dozen new tests with the general theme of getting trailing
zeroes right.

Add a test case for printf("%5.0f", 0.001).

Additional regression tests for grouping, parsing of '.*', and printing
of %f formats where the number of significant digits is < expt.

Test for bug in revision 1.54 of vfprintf.c.

Regression tests for printf()'s floating point formats.
Tests for correct printing of subnormals are lacking.