[Coin-ipopt] ./configure checking size of int

Andreas Waechter andreasw at watson.ibm.com
Wed Oct 11 15:18:09 EDT 2006

Hi Uwe,

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Thanks for making us aware of this problem.  Carl was able to reproduce it 
and we fixed it.  It had to do with Cygwin and the ^M lineend in output of 
a test program.

You can obtain the corrected code via subversion from the URL


By the way, the release policy of COIN project is changing.  From now on, 
what is in /trunk is no longer what users should get as the last stable 
version.  Instead, we have stable branches (like the one above), and point 
releases (snapshots of the stable branches) in /releases/3.2.1. etc. 
Tarballs will be created from the point releases.

I will follow up with a detailed message on this at some point.

As for the make 3.81 problem on Cygwin, we updated the current issues page 
at COIN which now describes how to get a working make executable:


Hope this helps,


On Thu, 5 Oct 2006, Uwe Kuessel wrote:

> Dear Mr. Waechter, dear IPOPT support team,
> i tried to install IPOPT the way you describe it in 'Introduction to
> IPOPT'. I am using cygwin for a windows system. i downloaded the third
> party code and started with ./configure. After some time the following
> error occurs in the cygwin prompt:
> .
> .
> .
> checking for int *... yes
> checking size of int *... 4
> configure: error: Unknown length of int *
> configure: error: /bin/sh './configure' failed for Ipopt
> I do not understand this error. The plattform is AMD 64 bit processor
> with a 32 bit windows 2000. It seems like it recognize the 32 bit system
> but then jumps in the wrong case. I tried hardcoding the size of int to
> 4 and then it runs succesfully, but i am unsure if this is good way of
> doing it. In addition i have the make  3.81 problem with multiple
> patterns. i tried to downgrade my make command by using the cygwin setup
> but a lower version is not supported . can i get it somewhere and
> install it manually? attached are the config.log files. it may help
> screening for my mistake.
> thanks a lot
> uwe kuessel

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