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

0
votes

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.

2
c++makefilemingwomnet++mingw-w64
Did you install libgmp? – rustyx
Yes, libgmp is already installed – Mulishia

2 Answers

0
votes

Try to add path to libgmp libraries using Makefrag. Go to OverSim-20190424 Project Properties, choose OMNeT++ | Makemake | select src | Options | Custom | Makefrag and write:

    LIBS += -L/c/libraries/libgmp

It is assumed that libgmp libraries (*.dll or *.a) are in C:\libraries\libgmp.

EDIT
Open Makefrag from oversim-20190424\src\ in a text editor, and then change LIBS and OMNETPP_LIBS to proper values:

LIBS += -L/sw/lib  -L/c/omnet561/omnetpp-5.6.1/tools/win64/mingw64/bin
OMNETPP_LIBS += -lgmp

or

OMNETPP_LIBS += -lgmp-10
0
votes

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 10 or has an idea of how it can be fixed, then please feel free to post.