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From: Hugh Myers <hsmyers AT gmail DOT com>
Date: Sun, 10 Apr 2011 04:47:37 -0600
Message-ID: <BANLkTi=XbmP=4PaC6e6_Lbe37r5C9hz5-Q@mail.gmail.com>
Subject: Re: newlib and long-double question
To: cygwin AT cygwin DOT com
Cc: Sisyphus <sisyphus1 AT optusnet DOT com DOT au>,
        marco atzeri <marco DOT atzeri AT gmail DOT com>, "N. C." <necrocowmoo AT gmail DOT com>
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The OP is trying to build Perl itself, not use it; hence the need for
long double support functions...

--hsm

On Sun, Apr 10, 2011 at 4:25 AM, Sisyphus <sisyphus1 AT optusnet DOT com DOT au> wrote:
>
> ----- Original Message ----- From: "marco atzeri"
>
>>> On a Linux system that I have access to, I see that those functions
>>> are in /lib/libm.* but cygwin's /lib/libm.* still seems to lack them.
>>> Is there any work around or alternate version ofthis lib that actually
>>> has these functions. I honestly do not mean to be rude, but how
>>> difficult is it to impliment these functions which seem so common in
>>> most unix-like systems?
>>
>> It is not overcomplicated to implement it, but it takes time and
>> someone to do it.
>> When I implemented all the complex functions (cabs, ccos..) I spent one
>> month
>> to make it right. A more capable guy will take less surely, but as
>> mention I see little
>> benefit moving from 64 to 80 bits so I was not interested to implement i=
t.
>>
>
> I sense an opportunity here to plug (to the op) the Math::MPFR perl modul=
e -
> for which the gmp and mpfr C libraries are required.
> I guess one could also use Math::BigFloat, but I assume the op has already
> considered (and rejected) that option - the performance hit incurred by i=
ts
> use has always discouraged me.
> Perhaps he has also already considered and rejected Math::MPFR, but it se=
ems
> to me to be by far the best option for achieving added precision with
> floating point numbers - at least until such time as building perl with
> -Duselongdouble has been facilitated.
>
> Cheers,
> Rob
>
>
>
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