[Clfs-dev] CBLFS - query about pages Liba52 / DJBFFT

[Andrew Rowland]

On Sun, 2008-09-14 at 11:24 +1000, db m wrote:
> Greets,
> 
> In CBLFS, we list DJBFFT as an optional package to the Liba52 build.
> 
> [ Note: I've not tested if liba52 benefits from djbfft routines or
> not. ]
> 
> 
> DJBFFT ;
> 
> Following the instructions in CBLFS for this package results in ;
> 
>  /usr/lib{32, 64}/djbfft.a
> 
> /usr/include/{complex4.h, fftc4.h, fftfreq.h, fftr8.h, real8.h,
> complex8.h, fftc8.h, fftr4.h, real4.h}
> 
> According to the djbfft homepage, this perhaps would be in error (for
> the headers), quote;
> 
> "Now you can use djbfft in your programs by compiling with
> -I/usr/local/djbfft/include 
> and linking with /usr/local/djbfft/lib/djbfft.a."
> 
> Perhaps the djbfft headers should be installed in
> '/usr/include/djbfft/'  or such??
> 
> 
> At any rate.....
> 
> 
> Liba52 ;
> 
> The configure option for liba52 to include djbfft support is ;
> 
> --enable-djbfft
> 
> ....how-so-ever, this will result in the liba52 build trying to link
> against the shared_lib target ;
> 
> -ldjbftt
> 
> ....which of course won't happen, as the djbfft build only results in
> the static_lib djbfft.a
> 
> 
> Now, I searched the tomes and came up with this wiki discussion about
> the
> so-called 'Bernstein controversy' ;
> 
> http://en.wikipedia.org/wiki/Talk:FFTW
> 
> 
> This makes me question the appropriateness/correctness of including
> DJBFFT as being
> an 'optional' package to the Liba52 library build at all.
> 
> Comments anyone?

Try the updated djbfft instructions.  I just built a shared djbfft
library.  liba52 built without error and the --enable-djbfft switch.
The resulting binary seems to use the djbfft library:

ldd src/a52dec
    linux-vdso.so.1 =>  (0x00007fff4edfe000)
    libdjbfft.so => /usr/lib64/libdjbfft.so (0x00002abf5bff1000)
    libm.so.6 => /lib64/libm.so.6 (0x00002abf5c20a000)
    libc.so.6 => /lib64/libc.so.6 (0x00002abf5c489000)
    /lib64/ld-linux-x86-64.so.2 (0x00002abf5bdd5000)
> 
/usr/include is a default location so putting the djbfft headers there
is OK unless they over write other headers of the same name.

> Regards,
> 
> Don
> 
> 
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