🚀 go-pugleaf

Chano Gómez Martínez wrote:
> 
> First of all, I want to apologize for my awful English.

  I should say the same ;^)

> 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.
> 
> Here is the result from compiling the Pascal source with GPC -v ...
> ================================================
>
(...messages from gpc...)

> -L/usr/i486-linux/lib /tmp/cca001031.o -lgpc -lgcc -lm -lc -lg
Here it is!                                         ^^^^^^

(...messages from gcc...)
>
> The only apparent difference between both results is in the libraries
> ( I think)
> Can anyone help me, please ???
> 

When you compile some code, you need to link it to the right libraries.
For instance, you need to link your program with the library libm which
is for math.
Try `gcc ... -lm`. In general, for foo.h try -lfoo, but you'd better
check /lib or /usr/lib.

>    Thanks in advance.
Hope this helps :)

-- 
Christophe Juniet 
chris@lmm.com 
Un Linux, s'il vous plaît!
(A Linux, please!)