[SCIP] Using GuRoBi as LP solver: error in compilation using make LPS=grb ZIMPL=false

[Gerald Gamrath]

Dear Nag,

on the other hand, if you want to keep using the Makefile, compiling 
SCIP should not be too hard either, you just need to set the correct links.
When SCIP asks you for the links, it should print some explanation at 
the top of the prompt, which also gives some more details about where 
your links should point to:

> * SCIP needs some softlinks to external programs, in particular, 
> LP-solvers.
> * Please insert the paths to the corresponding directories/libraries 
> below.
> * The links will be installed in the 'lib/include' and 'lib/static' 
> directories.
> * For more information and if you experience problems see the INSTALL 
> file.
>
>   -> "grbinc" is the path to the Gurobi "include" directory, e.g., 
> "<Gurobi-path>/include".
>   -> "libgurobi.*" is the path to the Gurobi library, e.g., 
> "<Gurobi-path>/lib/libgurobi.so"

Thus, you set the grbinc link correctly, but the 
libgurobi.darwin.x86_64.gnu.so link should point directly to the shared 
library of Gurobi, which should be 
/Library/gurobi810/mac64/lib/libgurobi81.so in your case.

If you want to update the links you can run "make LPS=grb ZIMPL=false 
links", which will ask you for new targets.

Best,
Gerald

Am 11.12.19 um 08:52 schrieb Gregor Hendel:
> Hi Nag,
>
> welcome to the SCIP mailing list.  I recommend you switch to CMake to 
> compile SCIP, if available, which is much easier, especially on 
> non-Linux platforms. Please refer to
>
> https://scip.zib.de/doc-6.0.2/html/CMAKE.php
>
> In your case, the cmake command should be
>
> cmake .. -DGUROBI_DIR=/Library/gurobi810/mac64/ -DLPS=grb
>
> Happy branch-and-pricing,
> Gregor
>
>
>
> Am 11.12.19 um 06:33 schrieb Naga Venkata Chaitanya Gudapati - 
> nagavenkata.gudapati at studio.unibo.it:
>> Hello Everyone,
>>
>>
>> I had never used SCIP before and I am hoping to use it for branch and 
>> price. I had never used CPLEX before and I am mostly familiar with 
>> GuROBi (I currently have my "column generation" Framework in GuRoBi) 
>> but I am facing lot of issues in trying to compile SCIP using GuRoBi 
>> as an LP solver.
>>
>> I compile using
>>
>> make LPS=grb ZIMPL=false
>>
>> I am facing issues at these following areas:
>>
>> > Enter soft-link target file or directory for "lib/include/grbinc" 
>> (return if not needed):
>>
>> I am not 100% sure where this directory is. I  am currently using 
>> this directory for the include
>>
>>     /Library/gurobi810/mac64/include
>>
>> and then for the library
>>
>> > Enter soft-link target file or directory for 
>> "lib/shared/libgurobi.darwin.x86_64.gnu.so" (return if not needed):
>>
>> and I am using this directory
>>
>> /Library/gurobi810/mac64/lib
>>
>>
>> I think the paths are wrong as it is failing to compile.
>>
>> This is the error I am getting:
>>
>> ld: can't map file, errno=22 file 
>> '/Users/cgudapati/scipoptsuite-6.0.2/scip/lib/shared/libgurobi.darwin.x86_64.gnu.so'
>>
>> clang: error:
>> linker command failed with exit code 1 (use -v to see invocation)
>>
>> build failed with READLINE=true: if readline is not available, try 
>> building with READLINE=false
>>
>> build failed with ZLIB=true: if ZLIB is not available, try building 
>> with ZLIB=false
>>
>> build failed with GMP=true: if GMP is not available, try building 
>> with GMP=false (note that this will deactivate Zimpl support)
>>
>> make[3]: *** [bin/scip-6.0.2.darwin.x86_64.gnu.opt.grb.none] Error 1
>>
>> make[2]: *** [all] Error 2
>>
>> make[1]: *** [scipbinary] Error 2
>>
>> make: *** [scipbinary] Error 2
>>
>>
>>
>> I understand the error and SCIP is telling me that it cannot find the 
>> .so library and neither can I.  I realize that GuRoBi support is 
>> still in Beta but any help is appreciated.
>>
>>
>> Thanks,
>>
>> Nag
>>
>>
>> _______________________________________________
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>> Scip at zib.de
>> https://listserv.zib.de/mailman/listinfo/scip
>
>
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