linking

[cicche]

what have I to write in my makefile in libs and cflags
for compiling my program with gcc?
thank
cicche

[Andrea Tagliasacchi]

i used g++ but i think is the same...
With g++ you have to include the header and for it you use the -I option
Also, an inclusion of the library and its path is necessary. In order to do so you have to use respectively the -l and -L options.

For example suppose to have the varius elements in these positions:
/usr/include/plplot/plstream.h
/usr/lib/libplplotcxxd.so.9.2.0
/usr/lib/libplplotcxxd.so.9
/usr/lib/libplplotcxxd.a
/usr/lib/libplplotcxxd.la
/usr/lib/libplplotcxxd.so

then my command is something like:
g++ -I/usr/include/plplot/ -L/usr/lib -lplplotcxxd helloworld.cpp

I tried it now and it works flawlessy. As a referece, here it is a VERY easy helloworld application I wrote. I think the examples they put are too complicated.. mine is a reduction of ex4.

###### BEGIN CODE ########
#include "plstream.h"
#include <iostream>
#include <cmath>

#ifdef USE_NAMESPACE
    using namespace std;
#endif

int main( int argc, char ** argv ) {
 
  plstream *pls = new plstream();

  // Initialize PLplot.
  plsdev( "gcw" ); /* USE GNOME WINDOW BY DEFAULT */
  plscolbg (255,255,255); /* SET THE GRAPH BACKGROUND */
 
  pls->init();  /* INITIALIZE THE WIDGET */
  pls->font(2); /* CHOOSE THE FONT */

 
  pls->adv(0); /* advance to next page */

  // NUMB DATA
  PLFLT *freql = new PLFLT[101];
  PLFLT *ampl  = new PLFLT[101];
  for (int i = 0; i <= 100; i++) {
    freql[i] = i;
    ampl[i]  = i + 3*sin( 2*M_PI*10*i/100 );
  }

  //pls->vpor(0.15, 0.85, 0.1, 0.9);  // set
  pls->vpor(0.1,0.9,0.1,0.9);
  pls->wind( 0, 100, 0, 100);         // set axis x-range, y-range

  // Try different axis and labelling styles.

  plrgb(0,0,0); pls->box("bnstg", 0.0, 0, "bnstvg", 0.0, 0);

  // Plot ampl vs freq.
  plcol0(1); c_plpoin( 101, freql, ampl, 94 ); /* plot line junction points */
  //plrgb(1,0,1); pls->line( 101, freql, ampl, 68 ); /* plot line junction points */

  // Put labels on.
  plrgb(0,0,0); pls->mtex("b", 3.2, 0.5, 0.5, "Frequency");
  plrgb(0,0,0); pls->mtex("l", 5.0, 0.5, 0.5, "Amplitude (dB)");

  delete[] freql;
  delete[] ampl;
  delete pls;
}