Problem using gmp

[jorgen]

I want to use gmp from the standard library and try this program:

using namespace std;
#include <gmp.h>
	
int main() {

	mpf_t x;
	mpf_init(x);

	return 0;
}

but I get this error when compiling with g++:

/tmp/ccc3vb2X.o:gmptest.cpp(.text+0x1d): undefined reference to '__imp____gmpf_init'

(gmptest.cpp is the name of my program)

I suspect the problem is connected to linking (whatever that is) cf. this answer to a similar problem, from http://www.cplusplus.com/forum/unices/2457/ :

rnodal (1)

You problem is not with compiling but linking. You need to tell g++ where to find also the library. You can configure codeblocks to do that for you. The weird things in front the function name is due to C++ code. C++ compilers put things in front of functions names. See this link for more:http://en.wikipedia.org/wiki/Name_mangling

Take care.

But this seems to imply that g++ can't find the library at all, which it can since lots of other stuff works fine. Suggestions?

[Athar]

gmp is not part of the standard library and so it will not be linked automatically.
Invoke g++ with the parameter -lgmp to link the gmp library.

See here for a short text about linking:
http://www.sethi.org/classes/cet375/lab_notes/lab_04_makefile_and_compilation.html

[jorgen]

Works like a charm, thanks!