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* admin/merge-gnulib (GNULIB_MODULES): Add count-leading-zeros.
* etc/NEWS: Document the change.
* lib/count-leading-zeros.c, lib/count-leading-zeros.h:
* m4/count-leading-zeros.m4: New files, copied from Gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* src/floatfns.c: Include count-leading-zeros.h.
(Flogb): Do not convert fixnum to float before taking the log,
as the rounding error can cause the answer to be off by 1.
* src/lisp.h (EMACS_UINT_WIDTH): New constant.
* test/src/floatfns-tests.el (logb-extreme-fixnum): New test.
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Without this fix, (ceiling most-negative-fixnum -1.0) returns
most-negative-fixnum instead of correctly signaling range-error,
and similarly for floor, round, and truncate.
* configure.ac (trunc): Add a check, since Gnulib’s doc says
‘trunc’ is missing from MSVC 9. The Gnulib doc says ‘trunc’ is
also missing from some other older operating systems like Solaris
9 which I know we don’t care about any more, so MSVC is the only
reason to worry about ‘trunc’ here.
* src/editfns.c (styled_format): Formatting a float with %c is now an
error. The old code did not work in general, because FIXNUM_OVERFLOW_P
had rounding errors. Besides, the "if (FLOATP (...))" was in there
only as a result of my misunderstanding old code that I introduced
2011. Although %d etc. is sometimes used on floats that represent
huge UIDs or PIDs etc. that do not fit in fixnums, this cannot
happen with characters.
* src/floatfns.c (rounding_driver): Rework to do the right thing
when the intermediate result equals 2.305843009213694e+18, i.e.,
is exactly 1 greater than MOST_POSITIVE_FIXNUM on a 64-bit host.
Simplify so that only one section of code checks for overflow,
rather than two.
(double_identity): Remove. All uses changed to ...
(emacs_trunc): ... this new function. Add replacement for
platforms that lack ‘trunc’.
* src/lisp.h (FIXNUM_OVERFLOW_P, make_fixnum_or_float):
Make it clear that the arg cannot be floating point.
* test/src/editfns-tests.el (format-c-float): New test.
* test/src/floatfns-tests.el: New file, to test for this bug.
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