Re: math.h functions returning incorrect results

I think you might be running into soft vs hard float problems. 
OpenZaurus 3.5.4 and above use softfloat and gcc 3.4. This is the same 
reason older sharp rom programs won't work on OZ.
[email protected] wrote:
> Hi All,
>
> I am using a Zaurus SL-5500 running OpenZaurus 3.5.4 ( 
> 2.4.18-rmk7-pxa3-embedix) with  Opie 1.2.1.
>
> libm version =  libm-2.3.90.so
>                          libm.so.6 -> libm-2.3.90.so
>
>
> I am trying to compile and run the following code which uses the 'cos' 
> function in math.h.
>
> include <stdio.h>
> #include <math.h>
> #define pi 3.14159265358979
>
> int main(int argc, char **argv)
> {
>     double valtester,val11;
>     valtester = 51.298351 * pi / 180;   //converting degrees to radians
>     printf("*[%f]\n",valtester);       
>     printf("**[%f]\n",cos(valtester));
> }
>
> ------------------------------------
>
> *Please note that the value 51.298351 above is not significant, it is 
> just an example.
>
> I am using the gcc cross compiler (gcc version 2.95.2 19991024 
> (release)) to build the code with the following command.
>
> $ gcc -o test test.c -lm
>
> The code compiles and builds without any problem. However when I run 
> it on the Zaurus, the 'cos' funcitons returns incorrect values (0.0000 
> in the above case). The return values do not seem to be random either, 
> and it is not 0.0000 always either, but it is always incorrect. For 
> example the restuls are always wrong compared to the values I get when 
> I compile and run the same code on my linux desktop. Also what is very 
> interesting is that I tried the ARM cross combiled code on an IPAQ 
> h2200 running Familiar, which returned me the correct results.
>
> Any ideas how to get this working on the Zaurus, or what is causing 
> the problem.
>
> Thanks,
> Damjee
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