Re: [Discuss-gnuradio] GNU Radio release 3.6.3 available for download

[Alexandru Csete]

On Thu, Jan 10, 2013 at 9:44 PM, Michael Dickens <address@hidden> wrote:
>
> You can select a compiler suite by appending to the usual "port" commands 
> "configure.compiler=XXX", where XXX is one of:
>
> gcc-3.3 gcc-4.0 gcc-4.2 llvm-gcc-4.2 clang apple-gcc-4.0 apple-gcc-4.2 
> macports-gcc-4.1 macports-gcc-4.2macports-gcc-4.3 macports-gcc-4.4 
> macports-gcc-4.5 macports-gcc-4.6 macports-gcc-4.7 macports-gcc-4.8 
> macports-clang-2.9 macports-clang-3.0 macports-clang-3.1 macports-clang-3.2
>
> Note that "clang" is Apple's installed clang, no matter the version (could be 
> 2.1, 3.1, 4.1; maybe others).  If you're running on Mac OS X 10.7 or 10.8, 
> I'd recommend using the following:
>
>   sudo port install gnuradio +orc +uhd configure.compiler=llvm-gcc-4.2
>
> to get Volk using a compatible GCC & thence the optimizations therein.  You 
> can find out a little (but, not much) more about this topic at < 
> http://guide.macports.org/#reference.phases.configure > and then scroll down 
> to or search for "configure.compiler".
>

Thanks for the tip - I will try to rebuild using gcc later and see
what difference it makes. For now I am happy that after installing
gnuradio, I could install the rtl-sdr and gr-osmosdr packages, and
since I already had Qt 4.8 installed I could also build gqrx without
major issues.

Concerning performance, I do see an "Using Volk machine: generic_orc"
message when I start gqrx; however, running an FM stereo receiver with
an rtlsdr dongle at 2 Msps, 4096 point fft at 30 fps with averaging
enabled consumes about 50% cpu on a dual core imac from early 2009.
I'm quite satisfied with that.

Alex