Unable to use GMP with Omnet++ - omnet++

Question

I have installed GMP on ubuntu. I download GMP-6.1.2 from "https://gmplib.org".Then I extracted it in Home folder and installed like:
1. cd gmp-6.1.2
2../configure
3. make
4. sudo make install
5. make check
I checked,gmp was installed in "/usr/local" and I opened omnet and I change these paths:
I entered Properties project:
1. in (c/c++ build | environment | path ), I added :
(/usr/local/include:/usr/local/lib) then I applied.
2. in (c/c++ General | paths and symbols | includes),I added
(/usr/local/include) in assembly, GNU c, GNU C++.then I applied.
At ( (c/c++ General | paths and symbols | Library paths). I added (/usr/local/lib). Then I applied.
Also ( (c/c++ General | paths and symbols | libraries). I wrote "gmpxx" and "gmp". Then I applied.
3. in (omnet++ | Makemake | select "src" folder | select Options |
custom | makefrag ) I added "EXTRA_OBJS=-lgmp". Then I applied them
and OK.
After that,I built my project and I received these errors :
Description Resource Path Location Type
Error refreshing Makefiles: /home/mar/Desktop/omnet_proj/id_2/test_independent/mixim-2.3/src/EXTRA_OBJS=-lgmp (No such file or directory) mixim-2.3 Unknown Makefile Problem
Description Resource Path Location Type
Program "gcc" not found in PATH mixim-2.3 [Discovery Options] page in project properties C/C++ Problem
Description Resource Path Location Type
Program "make" not found in PATH mixim-2.3 C/C++ Problem
I must say I am using MIXIM in Omnet++.
I don't know what is going on?
Could you please help me?
Thank you in advance of your help.

Answer 1

Assuming that you have installed libgmp using sudo apt-get install libgmp3-dev in your OMNeT++ project you have to do:
In header file (*.h) of simple module where you want to use gmp add:
#include <gmp.h>
Go to Project Properties, choose OMNeT++ | Makemake | select src | Options | Custom | Makefrag and write:
EXTRA_OBJS=-lgmp
To check you can add the following code somewhere in your source file, for example in initialize():
mpz_t a, b, c;
mpz_init_set_str(a, "123", 10);
mpz_init_set_str(b, "458", 10);
mpz_init(c);
mpz_add(c, a, b);
char * ctxt = mpz_get_str(NULL, 10, c);
EV << "c=" << ctxt << std::endl; // print the result
mpz_clear(a);
mpz_clear(b);
mpz_clear(c);

Answer 2

I think I can do that.
I have installed gmp in ubuntu. Then I added "gmp.h" and "gmpXX.h" to my project.
After that,I went to project properties | omnet++ | select SRC | Options | link | Additional libraries to link with:(-l option) and I inserted these two Option:
gmpxx , gmp .
Also,I added "/usr/local/include" in "paths and symbols(in project properties) | includes " and "/usr/local/lib" in " paths and symbols | library paths ".
After that,I added "/usr/include" in "paths and symbols(in project properties) | includes " and "/usr/lib/i386-linux-gnu" in " paths and symbols | library paths ".
And I built my project without any error.
At last,I run dear Jurzy D's example without any error.
I did not change any thing else.