[Ipopt] IPOPT and MinGW/MSYS

[Stefan Vigerske]

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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