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Subject: Re: libm.a
From: Bud Davis <bdavis9659@comcast.net>
To: gcc-help@gcc.gnu.org
Cc: h.p.g.ooijen@tm.tue.nl
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Date: Wed, 22 Dec 2004 13:12:00 -0000
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> I am trying to compile a program written in C that uses Fortran routines
> . However after compilation of the Fortran routines by g77, I get error
>  messages when I try to compile my program and to link t with the
>  translated Fortran routines (by using gcc). I get the impression that
>  thes messages are caused by the fact that I do not have libm.a
>  (the messages are like : undefined reference to power_dd, s_wsfe etc.).
>  Nobody here can help me, so maybe you can tell me where to get the
>  mathematical library libm.a.
> 
> 

Assuming you are on a linux system, or a close derivative, add the following
to your list of libraries during the final link:

-lg2c -lm

Here is a little example:

$ cat t.c
#include <stdio.h>
void x_(int*);
int main()
{
    int j;
    printf("this print is from the C program \n");
    j = 123; x_(&j);
    return 0;
}
$ cat tf.f
       subroutine x(i)
       integer*4 i
       print*,'this print is from the fortran',i
       end
$ g77 -c tf.f
$ gcc t.c tf.o
tf.o(.text+0xe): In function `x_':
: undefined reference to `s_wsle'
tf.o(.text+0x32): In function `x_':
: undefined reference to `do_lio'
tf.o(.text+0x55): In function `x_':
: undefined reference to `do_lio'
tf.o(.text+0x5a): In function `x_':
: undefined reference to `e_wsle'
collect2: ld returned 1 exit status
$ gcc t.c tf.o -lg2c
$ ./a.out
this print is from the C program
 this print is from the fortran 123



HTH,
bud davis