Re: [Sheflug] gcc - problems with math functions.

[Matthew John Palmer <nospam [at] uow.edu.au>]

On Sat, 10 Jun 2000, Barrie Bremner wrote:

>  Call me stupid, but I appear to be missing something here.

OK, stupid.  <g>  I think Barrie sounds better, though.

>  I`m attempting to compile a small C program for a uni course, which
> uses 
> 
> #include <math.h>
> 
>  Whenever any lines involving maths functions are uncommented I get this
> error:
> 
> [baz@shaitan baz]$ gcc versiontwo.c -o vtwo
> /tmp/ccMNZCnt.o: In function `main':
> /tmp/ccMNZCnt.o(.text+0x21b): undefined reference to `pow'
> /tmp/ccMNZCnt.o(.text+0x239): undefined reference to `pow'
> /tmp/ccMNZCnt.o(.text+0x24c): undefined reference to `sqrt'
> /tmp/ccMNZCnt.o(.text+0x27e): undefined reference to `atan'
> collect2: ld returned 1 exit status
> 
>  notice I`m only using gcc source.c -o output_program - should I be
> doing something else?

Yup.  -lm.  Rather illogical throughback to earlier times, but anything
deep-math related must be linked against the separate math library.


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Matthew Palmer
mjp16@uow.edu.au

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