Re: [Discuss-gnuradio] One more question about GNU Radio cross compilation

[Douglas Geiger]

On Wed, Oct 14, 2015 at 4:38 AM, Paul TT <address@hidden> wrote:

Hello,

I'm trying to build GNU Radio using a toolchain from Mentor Graphics (arm-none-linux-gnueabi-).

Some gnuradio dependecies i have builded manually from source using this toolchain.

<snip> 

export CC="arm-none-linux-gnueabi-gcc -mthumb -march=armv6t2 -mfloat-abi=softfp -mfpu=neon"

export CXX="arm-none-linux-gnueabi-g++ -mthumb -march=armv6t2 -mfloat-abi=softfp -mfpu=neon"

export CPP="arm-none-linux-gnueabi-gcc -E -mthumb -march=armv6t2 -mfloat-abi=softfp -mfpu=neon"

<snip> 

And in this case build fails with error message related to VOLK:

$ make

<snip> 

/home/user/NT1004/toolchain_build/GR/gnuradio/volk/kernels/volk/asm/neon/volk_16i_max_star_horizontal_16i.s: Assembler messages:

/home/user/NT1004/toolchain_build/GR/gnuradio/volk/kernels/volk/asm/neon/volk_16i_max_star_horizontal_16i.s:44: Error: selected processor does not support ARM mode `sxth r6,r6'

make[2]: *** [volk/lib/CMakeFiles/volk_obj.dir/__/kernels/volk/asm/neon/volk_16i_max_star_horizontal_16i.s.o] Error 1

make[1]: *** [volk/lib/CMakeFiles/volk_obj.dir/all] Error 2

make: *** [all] Error 2

<snip> 

Regards,

Paul

Paul,

 You appear to be targeting an processor that uses the armv6 ISA. I believe VOLK only supports armv7 at this point (although I'm uncertain if that's explicitly stated anywhere). You may be able to get a working build by disabling the inclusion of the assembly (.s) files - you would have to look at the lib/CMakeLists.txt file near line 408, and e.g. comment out the entire foreach/endforeach block. However I'm uncertain if all of the intrinsics-based kernels will similarly fail to build for you.

 Doug

--

Doug Geiger
address@hidden