Re: [Discuss-gnuradio] Volk build error using MacPorts GCC 4.7

[Nick Foster]

On 01/24/2013 07:37 AM, Michael Dickens wrote:
> [New subject line]
>
> Albert sent me the build log for:
>
> {{{
> sudo port install gnuradio +full configure.compiler=macports-gcc-4.7
> }}}
>
> and I can replicate the error on my computer; so, this must be a GCC 4.7 (or, 
> MacPorts's GCC 4.7) issue.  The error is:
>
> {{{
> build/volk/lib/volk_cpu.c:54:no such instruction: `xgetbv'
> }}}
>
> VOLK folks: what other info do you need from me/us to address this issue? - MLD
This is a compiler problem. xgetbv was added to vanilla GCC in 4.4. 
Apparently MacPorts' mutant GCC hasn't added it as of 4.7. The relevant 
check is line 128 of volk/lib/CMakeLists.txt. We could just disable AVX 
support on GCC < 4.7, but since 4.7 is basically the latest GCC out 
there it seems a little aggressive to disable AVX for everyone. I'd 
rather disable AVX on Mac. I haven't done Mac-specific platform 
detection in CMake; can anyone else suggest a Mac test to use here to 
disable AVX on Mac?

--n

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