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Linking C code that calls external library with OpenModelica

#10129  Permalink Top

Linking C code that calls external library with OpenModelica

Jun-29-20 01:38:57

Hi Modelica Gurus around the earth,

I am trying to linking my C code that calls external library, namely GLPK (GNU Linear Programming Kit) with my Modelica model.

The C code works just fine, I have tested it in a stand alone condition.

gcc standalonecode.c -lglpk -o standalonecode

When I plugged in the external C function with my Modelica models, I started to get this error:

Code:


/usr/bin/../lib/x86_64-linux-gnu/omc/libModelicaExternalC.a(ModelicaInternal.o): In function `ModelicaInternal_temporaryFileName':

(.text+0x571): warning: the use of `tmpnam' is dangerous, better use `mkstemp'

/usr/bin/../lib/x86_64-linux-gnu/omc/libModelicaMatIO.a(ModelicaMatIO.o): In function `Mat_VarDelete':

(.text+0x1e14): warning: the use of `mktemp' is dangerous, better use `mkstemp' or `mkdtemp'

examples.SimpleSystemOptimalDispatch_functions.o: In function `st_linprog':

examples.SimpleSystemOptimalDispatch_functions.c:(.text+0x8b1): undefined reference to `glp_create_prob'

examples.SimpleSystemOptimalDispatch_functions.c:(.text+0x8c1): undefined reference to `glp_set_obj_dir'

....

clang: error: linker command failed with exit code 1 (use -v to see invocation)

I believe that it comes from the linking process. Do you guys know how to solve this linking problem? Thanks!

Cheers,
Phil

Edited by: philgun - Jun-29-20 06:20:13
#10130  Permalink Top

Re: Linking C code that calls external library with OpenModelica

Jun-29-20 10:42:51

How does your Modelica function that calls the C looks like?
Did you give the library name via the external annotation?

#10132  Permalink Top

Re: Linking C code that calls external library with OpenModelica

Jun-29-20 13:33:33

Hi Philgun,
I saw your PM.

as adrpo said, we have to see your Modelica code that call the C function, especially the annotation, otherwise very little can be said.
Also please check the section 12.9.4 Annotations for External Libraries and Include Files of Modelica Specifications Modelica Documents.
You will find useful hints.

#10133  Permalink Top

Re: Linking C code that calls external library with OpenModelica

Jun-29-20 13:39:22

Already answered here:
https://stackoverflow.com/questions/626 … al-library

#10134  Permalink Top

Re: Linking C code that calls external library with OpenModelica

Jun-30-20 04:51:34

Hi guys,

Thanks for your reply. I do appreciate it. I managed to overcome the problem. The solution is in

https://stackoverflow.com/questions/626 … al-library

Thanks a lot!

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