[Ipopt] IPOPT and MinGW/MSYS

[John Pye]

Hi Stefan

Done:
https://projects.coin-or.org/Ipopt/ticket/123

I'd like to have the option of using the linear solver loader, so I'd 
prefer to keep this functionality if possible. It's been working for 
other MinGW users?

Cheers
JP

Stefan Vigerske wrote:
> Hi,
>
>   
>> Just trying to build IPOPT 3.8.1 on MinGW/MSYS. Previously I had no 
>> trouble with this, and built an ipopt.dll DLL that I had shipped with 
>> our product (which is GPL licensed, BTW!). I think this may previously 
>> have been with version 3.8.0 or earlier.
>>
>> Anyway, with the latest version, it seems that I can no longer use 
>> '--enable-shared' to produce a DLL. The following error is returned:
>>
>>     
>>> configure: WARNING: On Msys, shared objects are not supported. I'm 
>>> disabling you
>>> r choice.
>>>       
>
> I cannot even find this warning message in any configure file. Which
> (sub)project was configured when this message came?
> Can open a ticket with the config.log file from that directory attached?
>
>   
>> I don't understand this: MSYS most definitely does support shared 
>> objects (SOs aka DLLs), so why is my choice being disabled? We'd be very 
>> keen to have a DLL version of IPOPT available to us, because it means we 
>> can make it a drop-in optional component (dlopen-able) if we so choose.
>>
>> Next, I get the following error, which it is requested I tell you about. 
>> I can confirm that windows.h exists, and I have been able to use it with 
>> some other code that I've been working on recently.
>>     
>
> If you do not need the linear solver loader, then you may just disable
> it with --disable-linear-solver-loader . I think that is the only
> component in Ipopt that uses windows.h.
>
> Stefan
>
>   
>>> checking whether the linear solver loader should be compiled... yes
>>> checking windows.h usability... no
>>> checking windows.h presence... yes
>>> configure: WARNING: windows.h: present but cannot be compiled
>>> configure: WARNING: windows.h:     check for missing prerequisite headers?
>>> configure: WARNING: windows.h: see the Autoconf documentation
>>> configure: WARNING: windows.h:     section "Present But Cannot Be 
>>> Compiled"
>>> configure: WARNING: windows.h: proceeding with the preprocessor's result
>>> configure: WARNING: windows.h: in the future, the compiler will take 
>>> precedence
>>> configure: WARNING:     ## 
>>> -----------------------------------------------------
>>> ----- ##
>>> configure: WARNING:     ## Report this to 
>>> http://projects.coin-or.org/Ipopt/newt
>>> icket ##
>>> configure: WARNING:     ## 
>>> -----------------------------------------------------
>>> ----- ##
>>> checking for windows.h... yes
>>> checking dlfcn.h usability... no
>>> checking dlfcn.h presence... no
>>>       
>> Cheers
>> JP
>>
>>
>>
>>
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>>
>>     
>
>