Re: [Discuss-gnuradio] configure tests?

[Michael Dickens]

On May 26, 2006, at 8:52 PM, Eric Blossom wrote:
> There's already a test in the usrp and gr-usrp code for this.
> See configure.ac, AC_C_BIGENDIAN.

Yup, that works.  I'll send diff's once I have confirmation that this  
is the issue.

>   in test.asm (syntax could be wrong...)
>
>         .globl _start_test, _end_test
>
>         .align  16
>   _start_test:
>         .db     1
>         .align  4
>   _end_test:
>
> Then use nm to extract the resulting symbol values, followed by some
> python, etc to compute difference.

Yes, something like that, but '.align 16' is too big.  sed could do  
the trick too.

Even simpler would be:
+++++++++++++++++
        .text
        .globl  _abc
        .byte   1
        .align  4
_abc:
+++++++++++++++++
Then:

gcc -c -o test.o test.S
nm test.o | grep abc | sed -e 's/.*\([0-9a-fA-F][0-9a-fA-F]\).*abc.*/ 
\1/'

the output of the NM pipe should be '10' or '16' for 'log' based and  
something else (I think '04') for linear based.  This works for me  
(returns '10', which is in hex but that doesn't matter).  Should be  
pretty straight forward to stick in an m4 file. - MLD