How to fix 'cannot find -lgmp' build error on OMNeT++?

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NM

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6 Apr 2020, 09:12:1406/04/2020
to OMNeT++ Users

I have become aware that OverSim can be used with the newer versions of OMNeT++. I installed OMNeT++ 5.6.1 on Windows 10 by following the instructions in InstallGuide. Then, I imported INET 3.6.5 in OMNeT++ and built it, there were no errors. Finally, I imported OverSim-20190424 and when I build it I get the following error at the end of the build process:


make[1]: Entering directory '/c/omnet561/oversim-20190424/src'
Creating executable: ../out/gcc-debug/src/OverSim_dbg.exe
C:/omnet561/omnetpp-5.6.1/tools/win64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/7.1.0/../../../../x86_64-w64-mingw32/bin/ld.exe: cannot find -lgmp
collect2.exe: error: ld returned 1 exit status
make[1]: *** [Makefile:418: ../out/gcc-debug/src/OverSim_dbg.exe] Error 1
make[1]: Leaving directory '/c/omnet561/oversim-20190424/src'
make: *** [Makefile:11: all] Error 2
"make MODE=debug -j8 all" terminated with exit code 2. Build might be incomplete.

12:15:59 Build Failed. 3 errors, 0 warnings. (took 12s.448ms)


The other two errors are:
Description    Resource    Path    Location    Type
make: *** [Makefile:11: all] Error 2    OverSim             C/C++ Problem
make[1]: *** [Makefile:418: ../out/clang-debug/src/OverSim_dbg.exe] Error 1    OverSim             C/C++ Problem


Does anyone know how this error can be fixed? I have tried using OverSim on Windows 7 as well and tried using OMNeT++ 5.4.1 but the same error is still produced.

The libgmp libraries (libgmp-10.dll and libgmpxx-4.dll) are in the directory "C:/omnet561/omnetpp-5.6.1/tools/win64/mingw64/bin". I think the problem here might be that the software is using the wrong directory to search for the libraries but I'm not sure how to fix such an issue.

NM

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12 Apr 2020, 10:27:3212/04/2020
to OMNeT++ Users
For anyone who encounters the same problem, I managed to solve it by using OMNeT++ 5.6.1 and Oversim 20190424 on Ubuntu 18.04. When I built Oversim, I got an error "Could not find gmp.h", to solve that error I installed libgmp3-dev -

apt-get install libgmp3-dev

If somebody manages to get it to work on Windows or has an idea of how it can be fixed, then please feel free to post.

Rudolf Hornig

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14 Apr 2020, 09:38:1914/04/2020
to OMNeT++ Users
On windows you may need to specify 

OMNETPP_LIBS += -lgmp-10

as a library name and you may need to add also -L/c/mingw64/bin to the linker command line.

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