Re: [microblaze-uclinux] Double precision support

["Taeweon Suh" <suhtw@xxxxxxxxxxxxxx>]

Hi John,

Thanks for your suggestion.
I solved this problem with your suggestion. The problem was -lm, which I
put in the middle. It compiles well with it at the end.
Thanks,

Taeweon


> Hi Taewon,
>
> Taeweon Suh wrote:
>> One question about double-precision support in uClinux.
>> I added mpeg2 decoder user application from mediabench into a user
>> directory.
>> While compiling, I ran into a compile error. undefined __gtdf2.
>> The function looks like double precision comparion.
>> Doesn't the current cross compile library support double precision?
>
>
> The gtdf2 symbol is a low level floating point suport function - it is
> defined in the toolchain librariy file
>
> /home/bulldog2/suhtw/project/MB_uClinux/microblaze-elf-tools/bin/../lib/gcc-lib/microblaze/2.95.3-4/./../../../../microblaze/lib/libc.a
>
> You can confirm this with objdump
>
> Your problem might be to related to link order of the libraries.  Best
> thing to try is take the mb-gcc command line that is failing (the one
> you posted), and try changing the order of some of the link options
> (-lc, -lm) and explicit libfiles (libc.a, libgcc.a) and so on - see what
> effect that has.  I know this sounds vague, but you'll just have to
> experiment.  If/when you find an ordering that works, let me know and we
> 'll see about making it a generic fix.
>
> Regards,
>
> John
>
>
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>


----------------------------------------------
Taeweon Suh

Ph.D. Candidate
School of Electrical and Computer Engineering
Georgia Institute of Technology
Atlanta, Georgia USA

Lab: CoC345
Tel: +1-404-385-6273
E-mail: suhtw@ece.gatech.edu
----------------------------------------------

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