Very Computer

hello,

I need to use math functions (sin, cos, ....) on an embeded elinos system.

the #include math.h is ok
at link level the sin, cos ... functions are undefined

How (and where) do I have to configure the elinos kernel in order
to be able to call those functions in my project ??

thanks very much

Philippe

Quote:> I need to use math functions (sin, cos, ....) on an embeded elinos system.

> the #include math.h is ok
> at link level the sin, cos ... functions are undefined

  ^^^^^^^^^^^^^
"Link level" implies that this has nothing to do with the kernel (*).

Quote:

> How (and where) do I have to configure the elinos kernel in order
> to be able to call those functions in my project ??

It is also not specific to elinos: if you try to compile your
program on your host computer using it's native toolchain, it
will likely show the same behavior (my SuSE 8.0 system does).

The math functions are provided by the math library (libm.a).
Unlike the C library (which provides many functions, printf()
probably being the most popular one), the math library is not
linked in by default.

Solution: Add '-lm' to your linker commandline.

Rob

(*) As for the kernel (elinos or other): if your processor has no
    built-in floating point unit (e.g. i386/i486SX), you must enable
    the "math emulation" under "processor type and features"

--
Robert Kaiser                     email: rkaiser AT sysgo DOT de
SYSGO AG                          http://www.elinos.com
Klein-Winternheim / Germany       http://www.sysgo.de

thanks very much Robert !

what about training session on ELinOS system ?
I'm using a PPC MEN A12 Board .

Read you soon
Phil

Quote:> thanks very much Robert !

You're welcome.

Quote:> what about training session on ELinOS system ?

We offer these as a customer service (for a price, mind you ;-)).
Contact our sales people if you are interested.

Rob

--
Robert Kaiser                     email: rkaiser AT sysgo DOT de
SYSGO AG                          http://www.elinos.com
Klein-Winternheim / Germany       http://www.sysgo.de