[Ipopt] Missing random generator function using Cygwin 64

[Ted Ralphs]

I've replicated this on the Windows box I have on Jenkins. You can get all
the build logs etc from there:

http://jenkins.coin-or.org:8080/job/all-t-dll-x86_64-pc-cygwin-gcc4.8.1/135/console

Upgrading to 4.9.0 should fix the problem, as Stefan indicated, but I'll
leave it on 4.8.3 to try to chase down the problem. Incidentally, I
upgraded to 4.8.3 to try to fix what seemed to be a bug in 4.8.1 that was
preventing OS from building.

Cheers,

Ted

Cheers,

Ted


On Tue, Jun 10, 2014 at 2:17 PM, Stefan Vigerske <stefan at math.hu-berlin.de>
wrote:

> Hi,
>
> I'm running GCC 4.9.0 under Linux and get no problem:
>
> checking whether drand48 is declared... yes
> checking whether rand is declared... yes
> checking whether srand is declared... yes
>
> Stefan
>
>
> On 06/10/2014 05:57 PM, Tony Kelman wrote:
>
>> Good.
>>
>> This worries me slightly. If anyone on the mailing list has access to a
>> Linux distribution where GCC 4.8.3 is already easily available, I’d
>> appreciate if you could contact me and let me know whether or not you see
>> the same thing. I have no idea at the moment whether this change in
>> behavior is specific to Cygwin or will start showing up on Linux as well.
>>
>> Thanks,
>> Tony
>>
>>
>> From: Yao Xie
>> Sent: Tuesday, June 10, 2014 8:28 AM
>> To: Tony Kelman ; ipopt at list.coin-or.org
>> Subject: RE: [Ipopt] Missing random generator function using Cygwin 64
>>
>> Yes, it works... after I downgraded gcc from 4.8.3 to 4.8.2
>>
>> Thanks again.
>>
>> Yao
>>
>> ------------------------------------------------------------
>> --------------------
>>
>> From: Tony Kelman (kelman at berkeley.edu)
>> Sent: Tuesday, June 10, 2014 08:49 AM
>> To: Yao Xie (xieyao04 at gmail.com); ipopt at list.coin-or.org
>> Subject: Re: [Ipopt] Missing random generator function using Cygwin 64
>> Ah, crap.
>> conftest.cc:75:22: error: ISO C++ forbids casting between
>> pointer-to-function and pointer-to-object [-Werror=pedantic]
>>     char *p = (char *) rand;
>>                        ^
>> Apparently you’ve updated your GCC more recently than I have, and now in
>> 4.8.3 this old-autotools method of checking for the existence of a function
>> is an error, where it used to be a warning. I’m really surprised the
>> grouping of a warning would be changed in a point release like that... the
>> right solution is to update our autotools version, but that’s a big job
>> that we haven’t put enough full-time work into yet. I’ll try to think if
>> there’s a quick short-term fix for this, but in the meantime can you try
>> reverting your GCC version to the previous release through Cygwin’s setup
>> program?
>> -Tony
>> P.S: The attachment came through to me personally, but I guess not the
>> mailing list. For future use you can try uploading log files somewhere like
>> gist.github.com and send a link in your message.
>>
>>
>>
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>>
>>
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-- 
Dr. Ted Ralphs
Associate Professor, Lehigh University
(610) 628-1280
ted 'at' lehigh 'dot' edu
coral.ie.lehigh.edu/~ted
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