Re: [Discuss-gnuradio] Problem compiling on "Raspbian wheezy".

On 19 July 2012 18:06, Nick Foster <nick@ettus.com> wrote:
> The --mfpu=neon flag is inappropriate for Raspberry Pi, which lacks NEON. I
> suspect Gnuradio's build system is detecting ARM and assuming NEON exists. I
> know gr-filter is doing this (see
> gnuradio/gnuradio-core/src/lib/filter/CMakeLists.txt line 212).
>
> Some rudimentary checking for NEON is probably appropriate. Volk is already
> doing this, although its checks are at runtime so they look a little
> different than a CMake script would.

So I found [1] what appears to be the correct flags and set these:

cmake -DCMAKE_CXX_FLAGS:STRING="-march=armv6 -mfpu=vfp
-mfloat-abi=hard" -DCMAKE_C_FLAGS:STRING="-march=armv6 -mfpu=vfp
-mfloat-abi=hard" ../

But now the build fails even earlier with gnuradio-core:

[ 17%] Building CXX object
gnuradio-core/src/lib/CMakeFiles/gnuradio-core.dir/filter/gr_fir_fff_armv7_a.cc.o
[ 17%] Building C object
gnuradio-core/src/lib/CMakeFiles/gnuradio-core.dir/filter/dotprod_fff_armv7_a.c.o
/tmp/ccHDAfuu.s: Assembler messages:
/tmp/ccHDAfuu.s:26: Error: selected FPU does not support instruction
-- `vmov.f32 q8,#0.0'
/tmp/ccHDAfuu.s:27: Error: selected FPU does not support instruction
-- `vmov.f32 q9,#0.0'
/tmp/ccHDAfuu.s:30: Error: selected processor does not support ARM
mode `vld1.32 {d0,d1,d2,d3},[r0]!'
/tmp/ccHDAfuu.s:31: Error: selected processor does not support ARM
mode `vld1.32 {d4,d5,d6,d7},[r1]!'
/tmp/ccHDAfuu.s:32: Error: selected FPU does not support instruction
-- `vmla.f32 q8,q0,q2'
/tmp/ccHDAfuu.s:33: Error: selected FPU does not support instruction
-- `vmla.f32 q9,q1,q3'
/tmp/ccHDAfuu.s:35: Error: selected FPU does not support instruction
-- `vadd.f32 q8,q8,q9'
/tmp/ccHDAfuu.s:36: Error: selected processor does not support ARM
mode `vpadd.f32 d0,d16,d17'
make[2]: *** [gnuradio-core/src/lib/CMakeFiles/gnuradio-core.dir/filter/dotprod_fff_armv7_a.c.o]
Error 1
make[1]: *** [gnuradio-core/src/lib/CMakeFiles/gnuradio-core.dir/all] Error 2
make: *** [all] Error 2

Which IIRC is around where it was failing when I did not set any flags
at all with Cmake.

Regards,

Andrew

[1] http://www.raspbian.org/RaspbianFAQ#What_compilation_options_should_be_set_Raspbian_code.3F

--
Andrew Back
http://carrierdetect.com

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