Question

Having trouble using libstatgrab — I receive the following error at compile time:

"libstatgrabTest.cpp:16: undefined reference to sg_get_process_stats"

I’m guessing it is because I need to include it’s .so files at the linking state — although I’m not sure. As you can see below, I am currently including the statgrab.h header file. I performed configured && make && make install for the library.

If I search for libstatgrab*, I come across the following:

./usr/local/lib/libstatgrab.so.6.2.3
./usr/local/lib/libstatgrab.la
./usr/local/lib/libstatgrab.so.6
./usr/local/lib/libstatgrab.a
./usr/local/lib/libstatgrab.so.6.2.2
./usr/local/lib/libstatgrab.so
./usr/local/lib/pkgconfig/libstatgrab.pc

Another search for statgrab* returns the following (relevant items only):

./usr/local/bin/statgrab
./usr/local/include/statgrab_deprecated.h
./usr/local/include/statgrab.h

At compilation, I run: g++ -g -c libstatgrabTest.cpp

At linking, I run: g++ -L/usr/local/lib libstatgrab.o -o libstatgrabTest

Any idea what I am doing wrong? The code within libstagrabTest.cpp is shown below:

// external libraries
#include <statgrab.h> // libstatgrab (http://www.i-scream.org/libstatgrab/)

// namespace
using namespace std;

int main(void) {
  // try to initalize libstatgrab

  int * entries;
  sg_process_stats * systemStats = sg_get_process_stats(entries);

  // return
  return 0;
}

Answer 1

g++ -L/usr/local/lib libstatgrab.o -o libstatgrabTest

should be (tested with your code snipper on Ubuntu Natty):

g++ -L/usr/local/lib -o libstatgrabTest -lstatgrab

or, to link statically:

g++ -L/usr/local/lib -o libstatgrabTest /usr/lib/libstatgrab.a

Tested both on my box, with your exact source.