Thread: /usr/bin/ld: cannot find -lgmp

  1. #1
    Registered User JM1082's Avatar
    Join Date
    Mar 2011

    /usr/bin/ld: cannot find -lgmp

    Hi all,

    I'm interested in using the GNU Multiple Precision library so I can work with big numbers however after a successful installation I can't run an example code.

    My code is as follows:
    #include <stdio.h>								/* for printf */
    #include </state/partition1/home/mcdonnellj/assignmentB/gmp-5.0.5/gmp.h>
    int main( int argc, char *argv[] )
    	mpz_t a, b;                 				/* working numbers */
    	if( argc < 3 )
    	{											/* not enough words */
    		printf( "Please supply two numbers to add.\n" );
    		return 1;
    	mpz_init_set_str( a, argv[1], 10 );			/* Assume decimal integers */
    	mpz_init_set_str( b, argv[2], 10 );			/* Assume decimal integers */
    	mpz_add( a, a, b );							/* a=a+b */
    	printf( "%s + %s => %s\n", argv[1], argv[2], mpz_get_str ( NULL, 10, a ) );
    But when I run it using the 'gcc -o test test.c -lgmp -lm' command as specified I get the following error:
    /usr/bin/ld: cannot find -lgmp

    Does anybody know where I'm going wrong?

  2. #2
    and the hat of int overfl Salem's Avatar
    Join Date
    Aug 2001
    The edge of the known universe
    Given the strange path for your #include, you didn't install gmp in the usual place.

    So perhaps you need
    gcc -L/state/partition1/home/mcdonnellj/assignmentB/gmp-5.0.5/lib -o test test.c -lgmp -lm

    Well, the -L option should be the directory where libgmp.a resides.

    Likewise, you should have
    #include <gmp.h>

    And use the -I/path/to/somewhere option to tell the compiler where to find the header file.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.

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