Unable to use GMP with Omnet++

问题:

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.

回答1:

Assuming that you have installed libgmp using sudo apt-get install libgmp3-dev in your OMNeT++ project you have to do:

1. In header file (*.h) of simple module where you want to use gmp add:

   #include <gmp.h>
   

2. 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);

回答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.