[Coin-discuss] problem with OSI and CPLEX on MinGW+MSYS

[Andreas Waechter]

Hi Michal,

Great, thanks for summarizing your experience and hints.

It would be really great if you could put this onto the CoinHelp wiki 
pages.  We have a section there for user comments; yours seem to fit 
nicely in the "Comments and Tricks for Configuration" part.  The website 
is:

https://projects.coin-or.org/CoinHelp/wiki/user-comments

Thanks,

Andreas

On Wed, 23 May 2007, Michal Kaut wrote:

> Hello,
>
> I have had a problem with the OSI configure script, when using Cplex 9.0 
> library, on Windows with MinGW+MSYS. I managed to localize the problem and 
> find the way around it, but I still do not know what the problem is and how 
> to correct it - and, most importantly, whether it is a problem with my 
> GCC/MinGW/MSYS configuration or a general issue.
>
> Anyway, I just thought that someone else might find the "solution" useful...
>
>
> 1. The problem
> I run ./configure -C, with the following options in a config.site file:
> with_cplex_incdir=/g/Cplex90/include/ilcplex
> with_cplex_lib="-L/g/Cplex90/lib/msvc6/stat_mda -lcplex90"
> The script stops with an error; The last few lines of output are:
> checking if user provides library for Cplex... yes
> checking for /g/Cplex90/include/ilcplex/cplex.h... yes
> checking whether symbol CPXgetstat is available with CPX... no
> configure: error: Cannot find symbol CPXgetstat with CPX
> configure: error: /bin/sh './configure' failed for Osi
>
> 2. Localizing the problem
> The error comes from configure in the Osi directory, from testing the CPLEX 
> library. For this test, configure creates a file conftest.c, which won't 
> link, causing the error. The error message from the linker is
> "conftest.c: undefined reference to `CPXgetstat'".
> I tried to build the file manually, with the same result.
>
> 3. Way around the problem
> It turns out that the configure script configures everything OK, i.e. the 
> problem is in the test file conftest.c, not in the configuration.
> The "solution" is therefore to skip the test, by supplying an option 
> "--disable-cplex-libcheck" to the configure script.
> This way, both the 'configure', 'make' and 'make test' works without further 
> problems, as do the Osi examples...
>
>
> Regards,
> Michal Kaut
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