I guess that is because in order to distribute a binary for Cygwin,
you have to link it against the Cygwin dll and maybe even provide a
Cygwin dll. That would be GPL licensed.

That had not specifically occurred to me, but I guess it makes sense.
Thanks for pointing it out.

Bill.

On 11 February 2011 15:28, Paul Leyland <p...@leyland.vispa.com> wrote:
> I should clarify:  developing MPIR itself is fine under Cygwin as it is
> released under LGPL.  However, many MPIR people are also involved with
> the bsdnt project and it is all too easy for cross contamination to
> occur.  Those people really ought to avoid Cygwin, IMO.
>
> Sorry for any confusion caused by an incomplete post.
>
> Paul
>
>
> On Fri, 2011-02-11 at 15:24 +0000, Paul Leyland wrote:
>> > ---------- 2 of 4 ----------
>> > From: Bill Hart <goodwillh...@googlemail.com>
>> > Date: Feb 10 10:07AM
>> > Url: http://groups.google.com/group/mpir-devel/msg/f15fa392b04436d
>> >
>> > Unfortunately I don't know what is causing this. Jason Moxham did most
>> > of the recent work on Cygwin and did lots of testing. It should be
>> > fine. I can only recommend ensuring you have the latest Cygwin. If
>> > there is still a problem, maybe try adding a #include <string> as you
>> > suggest and see if the problem goes away. This problem is certainly
>> > confined to certain versions of Cygwin it seems.
>> >
>> > Bill.
>>
>> Alarm bells are ringing loudly.
>>
>> I hope that everyone who is using Cygwin are aware that they CAN NOT
>> DISTRIBUTE BINARIES BUILT UNDER THE FREE CYGWIN LICENSE.  If you do so,
>> the corresponding source must be released under the GPL.
>>
>> If you pay for the commercial Cygwin license, or distribute source only
>> you're OK.
>>
>> I ran into this one some years ago when I was forbidden to distribute
>> binaries built under Cygwin because the corresponding sources were BSD
>> licensed.
>>
>> I STRONGLY recommend that you do not use Cygwin in the Windows
>> environment.  Use MSYS/MinGW to avoid infection with the GPL virus.
>>
>>
>> Paul
>>
>
>
>

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