[Buildroot] C double type problem - at91sam9263

[Hinko Kocevar <hinko.kocevar@cetrtapot.si>]

Richard Hardy wrote:
> Hi Everyone,
> 
> I am quite new to using buildroot and embedded linux systems in general.
> However, I have managed to use buildroot to get a (nearly) working
> system up and running for an at91sam9263 board. (kernel v 2.6.22, uClibc
> v 0.9.29)
> 
>  
> 
> I have one annoying problem though. One of the packages I am compiling
> from source uses C's "double" type, and this does not seem to be
> behaving as I need it to.
> 
>  
> 
> I have created a simple example program:
> 
>  
> 
> ...
> 
> int main (int argc, char *argv[])
> 
> {
> 
> double test;
> 
> test = 1;
> 
> fprintf(stderr, "Test double = %f.\n", test);
> 
> }
> 
>  
> 
> And the output that I see is:
> 
>  
> 
> Test double = 1000000.
> 
>  
> 
>  
> 
> I guess that this is due to one of the options, somewhere, in either the
> Linux Kernel, uClibc or something else, but I don't know how to find out
> which one. 
> 
>  
> 
> Can anyone point me in the right direction of where to look?

I see it too on cris architecture. I think it is uClibc related, at least 0.9.29. 
I'll try to reproduce on x86..
IMHO only printf is buggy, otherwise doubles and floats seem to have correct value.

Regards,
Hinko

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