🚀 go-pugleaf

In article <4l1and$iql@news.ran.es>, chano@ran.es (Chano Gómez Martínez) wrote:

> First of all, I want to apologize for my awful English.
> 
> Now, the C stuff :
> 
> I'm trying to port a C program from Borland C++ 3.1 to GCC under
> Linux.
> My problem is that I can't use any function from math.h !!!
> The file is correctly #include'd ( in fact, I get no compilation
> errors ) but the linker always tells me something like :
> 
> /tmp/cca000971.o(.text+0x39): undefined reference to `exp'
> 
> The funny thing is that GPC ( the GNU Pascal compiler ) allows me to
> use math.h functions lihe exp(), sin(), fabs(), etc, but when I
> convert my Pascal programs to C with p2c and try to compile them with
> GCC , I get the same error again.
> 
<<<deletia regarding GPC and gcc>>>
> 
> The only apparent difference between both results is in the libraries
> ( I think)
> Can anyone help me, please ???
> 

Yes, the difference is in the libraries.  To use exp, sin, ...
you need to include '-lm' (at least on your system) in the invoking 'gcc'
line.  The GPC thing had it already included.  Most functions in <math.h>
need the '-lm' addition if compiled under a Unix style compiler.  This is
probably an FAQ! (see the C faq's on the friendly 'rtfm' server).

-- 
Tom Watson
tsw@3do.com         (Home: tsw@johana.com)