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gawk: MPFR features

 15.3 Arbitrary-Precision Arithmetic Features in 'gawk'
 By default, 'gawk' uses the double-precision floating-point values
 supplied by the hardware of the system it runs on.  However, if it was
 compiled to do so, and the '-M' command-line option is supplied, 'gawk'
 uses the GNU MPFR ( and GNU MP (
 (GMP) libraries for arbitrary-precision arithmetic on numbers.  You can
 see if MPFR support is available like so:
      $ gawk --version
      -| GNU Awk 4.1.2, API: 1.1 (GNU MPFR 3.1.0-p3, GNU MP 5.0.2)
      -| Copyright (C) 1989, 1991-2015 Free Software Foundation.
 (You may see different version numbers than what's shown here.  That's
 OK; what's important is to see that GNU MPFR and GNU MP are listed in
 the output.)
    Additionally, there are a few elements available in the 'PROCINFO'
 array to provide information about the MPFR and GMP libraries (⇒
    The MPFR library provides precise control over precisions and
 rounding modes, and gives correctly rounded, reproducible,
 platform-independent results.  With the '-M' command-line option, all
 floating-point arithmetic operators and numeric functions can yield
 results to any desired precision level supported by MPFR.
    Two predefined variables, 'PREC' and 'ROUNDMODE', provide control
 over the working precision and the rounding mode.  The precision and the
 Setting precision:: and ⇒Setting the rounding mode for more
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