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Subject:	Re: Missing functions in DJGPP libc (and/or) libm
References:	<xnh7xoo4va DOT fsf AT envy DOT delorie DOT com>
	<4aed4e35-34a2-56ba-582a-c9c6ccae6699 AT iki DOT fi>
	<e3e2c4ee-5e9c-47f9-98aa-a67a45bd67e7 AT iki DOT fi>
To:	djgpp-workers <DJGPP-workers AT Delorie DOT com>
From:	Brian Inglis <Brian DOT Inglis AT SystematicSw DOT ab DOT ca>
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Organization:	Systematic Software
Message-ID:	<128ba9e6-0dc8-4617-00ee-216732fa0ff3@SystematicSw.ab.ca>
Date:	Mon, 13 Apr 2020 12:18:13 -0600
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On 2020-04-13 03:38, Andris Pavenis (andris DOT pavenis AT iki DOT fi) [via
djgpp-workers AT delorie DOT com] wrote:
> On 4/13/20 7:25 AM, Andris Pavenis (andris DOT pavenis AT iki DOT fi) [via
> djgpp-workers AT delorie DOT com] wrote:
>> On 4/12/20 10:56 PM, DJ Delorie wrote:
>>> Looks like C99 support is required now, and our library is C89(ish).
>>>
>>> If someone wants to put in the effort:
>>> http://www.open-std.org/jtc1/sc22/WG14/www/docs/n1256.pdf
>>>
>>> Else we might have to accept that some parts of djgpp have reached
>>> end-of-life :-(
>>
>> How it is handled in CygWin. It seems to have newlib which do not have these
>> functions (at least I did not easily find them browsing GIT repon tree).
>>
>> It is unlikely that CygWin will not support Fortran for gcc-10
>>
> At least Mingw does not seem to be affected. I'm able tro build current GCC
> master branch for Mingw as cross-compiler from Linux (Arch Linux, took some time
> to get MAKEPKG file ready especially if each build lasts some time even on Ryzen
> 9 3950X)
> 
> At least fma(|fl) stuff we could borrow from Mingw libm (license notice on the
> top of file seems to allow that)
> 
> The problem with missing libm functions will however be a problem for Newlib
> targets. Checked one embedded target I have to deal at work at Finnish
> Meteorological institute it also do not have these functions. Of course no
> native compiler there. I also have not build cross-compiler for it myself.

Ported to Cygwin from Mingw64:

	https://sourceware.org/legacy-ml/cygwin-cvs/2016-q1/msg00198.html

https://sourceware.org/git/?p=newlib-cygwin.git;a=tree;f=winsup/cygwin/math

but newlib supports long double functions only for LDBL_EQ_DBL ports:

https://sourceware.org/git/?p=newlib-cygwin.git;a=tree;f=newlib/libm/common

-- 
Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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