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Using functions in coded function object | undefined symbol

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Old   November 23, 2020, 04:18
Default Using functions in coded function object | undefined symbol
  #1
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Marius
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Hi,

I have written a coded function object with a working code block.
Now I'm trying to package this code into individual functions so I can use them in multiple function objects and maintain a clean structure in my controlDict file.
For this I created a directory pp_functions in the system directory where I put all my header and cpp files.

I'm having problems with including and using these functions in my coded function objects.

For testing I created a header file test_methods.h
Code:
#ifndef TEST_METHODS_H// To make sure you don't declare the function more than once by including the header multiple times.
#define TEST_METHODS_H

void test_method();

#endif
and the cpp file test_methods.cpp
Code:
#include "pp_functions/test_methods.h"

void test_method()
{
    Info << "TEST METHOD" << endl;
}
in pp_functions.

My coded function object looks like this:
Code:
codedTest
{
    libs        ("libutilityFunctionObjects.so");
    type coded;
    // Name of on-the-fly generated functionObject
    name codedTest;
    codeOptions
    #{
        -I$(FOAM_CASE)/system/pp_functions
    #};
    codeInclude
    #{
        #include "test_methods.h"
    #};
    codeWrite
    #{
        test_method();
    #};
}
Running the solver results in this error message
Code:
Using dynamicCode for functionObject codedTest at line 15 in "/home/openfoam/system/controlDict/functions/codedTest"
Creating new library in "dynamicCode/codedTest/platforms/linux64GccDPInt32Opt/lib/libcodedTest_2146ab0e392c492df3767af3c8ac8b8b90ae358e.so"
Invoking "wmake -s libso /home/openfoam/dynamicCode/codedTest"
wmake libso /home/openfoam/dynamicCode/codedTest
    ln: ./lnInclude
    wmkdep: functionObjectTemplate.C
    Ctoo: functionObjectTemplate.C
    ld: /home/openfoam/dynamicCode/codedTest/../platforms/linux64GccDPInt32Opt/lib/libcodedTest_2146ab0e392c492df3767af3c8ac8b8b90ae358e.so
simpleFoam: symbol lookup error: /home/openfoam/dynamicCode/platforms/linux64GccDPInt32Opt/lib/libcodedTest_2146ab0e392c492df3767af3c8ac8b8b90ae358e.so: undefined symbol: _Z11test_methodv
I'm using the docker version of OpenFoam 8.

Did I miss a step or some definition before runnning simpleFoam?
Does anyone know how to solve the "undefined symbol" error?

Any help would be appreciated.
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Old   November 23, 2020, 09:20
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Michael Alletto
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did you compile your cpp file. The symbol look up error is when you have defined your function (or class) but the linker did not find the actual execution block.



So you should probably compile your cpp file, make a library out of it and include it into libs. This should work




Best


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Old   November 25, 2020, 03:26
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Marius
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Hi Michael,

thank you for your reply.

Quote:
Originally Posted by mAlletto View Post
So you should probably compile your cpp file, make a library out of it and include it into libs.
Obviously I didn't do that. Tried compiling it yesterday, but it always gave me errors.
I guess at this point I could just as well start to define my own function objects, that will probably be cleaner than using the coded function object with my own library of functions.
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Old   November 25, 2020, 03:34
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Michael Alletto
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you can include your code directly in the codeWrite or codeExecute blocks. So wmake will take care of the compilation
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