Re: [Discuss-gnuradio] Help with building GNU Radio for Android

[Tom Rondeau]

On Fri, Aug 21, 2015 at 9:20 AM, devin kelly <address@hidden> wrote:

I found the section of code the python NDK is complaining about:

#ifndef LONG_BIT
#define LONG_BIT (8 * SIZEOF_LONG)

#endif

#if LONG_BIT != 8 * SIZEOF_LONG
/* 04-Oct-2000 LONG_BIT is apparently (mis)defined as 64 on some recent
 * 32-bit platforms using gcc.  We try to catch that here at compile-time
 * rather than waiting for integer multiplication to trigger bogus
 * overflows.
 */
#error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
#endif

So it looks like maybe SIZEOF_LONG is what's really not properly defined.  I then found this python mailing list post:

https://mail.python.org/pipermail/python-bugs-list/2004-November/026111.html

The first poster says that this will limit python to only using glibc systems, which makes total sense here given that Android uses bionic not glibc.  What I don't understand is that bionic seems to define LONG_BIT, SIZEOF_LONG etc correctly:

https://github.com/android/platform_bionic/blob/d717b1a3e55db9b7625a46bec950e856cc107951/libc/include/sys/limits.h

So what's it complaining about?

Devin

Thanks for that, Devin. I'm still not sure what's going wrong, but I wanted to say that, yes, our model for Android is to try to stay as well within the standard Android system and tools as possible, including using bionic and not an external C library. However, we are also using the GCC libstdc++ that comes with the SDKs.

Schuyler, there might have been a change in something in Android (they really don't care about changing things between versions) when building the standalone SDK. Take a look at the options you passed when building that part of the project. Also, make sure you are using GCC 4.8 and NOT 4.9. We have other issues with 4.9.

Tom

 

On Thu, Aug 20, 2015 at 10:43 AM, Tom Rondeau <address@hidden> wrote:

On Mon, Aug 17, 2015 at 7:28 PM, Schuyler St. Leger <address@hidden> wrote:

I am trying to build GNU Radio for Android and am having issues with the build process.

I first tried building GNU Radio for Android on Mac OS X 10.10.4. I was able to follow the directions successfully until I had to build gr-grand. When I tried to build gr-grand I got this error (see error 1). I have tried searching for this error, but have not found any useful information from my search. I am not sure if this is an error with the build procedure, or if it is an error with the Android NDK and Python.

We'll have to spend some time looking into this. Most of use working on the Android stuff are using Linux -- generally Ubuntu, either 14.04 or 15.04 (I use both versions, depending on which machine I'm on). This could be a conflict with the installed Python and the one in the SDK, or possibly just a bug in the SDK.

Although, now that I think about it, there's no reason to SWIG gr-grand. You'll never use that in Python on Android; we only use the c++ library out, and specifically the static libgnuradio-grand.a library.

Maybe try adding the flag -DENABLE_PYTHON=False to the cmake line?

 

I then tried building GNU Radio for Android in a Ubuntu 14.04 64 bit VM, but when trying to stage Boost (./b2) I get this output from Boost (see error 2) and get an error about -march=armv7-m not being a supported compiler flag when Boost starts compiling. I have tried adding the toolset=gcc-android to Boost but this did not fix the problem (I had to do this on Mac to get Boost to use the configuration in the user-config.jam file).

Are you sure you want armv7-m? Most of what we're using is armv7-a. But you might just try "armv7" instead to use a more generic v7 architecture. Take a look at the gcc man page for a list of supported machines. This might be something you'll need to play around with.

 

I would like help getting this working, as I really want to get GNU Radio working on Android for me.

Schuyler St. Leger

Error 1:
[ 80%] Building CXX object swig/CMakeFiles/_grand_swig.dir/grand_swigPYTHON_wrap.cxx.o
In file included from /opt/android-toolchain/include/python2.7/Python.h:58:0,
                 from /opt/grandroid/gr-grand/build/swig/grand_swigPYTHON_wrap.cxx:167:
/opt/android-toolchain/include/python2.7/pyport.h:1029:2: error: #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
 #error "LONG_BIT definition appears wrong for platform (bad gcc/glibc config?)."
  ^
make[2]: *** [swig/CMakeFiles/_grand_swig.dir/grand_swigPYTHON_wrap.cxx.o] Error 1
make[1]: *** [swig/CMakeFiles/_grand_swig.dir/all] Error 2
make: *** [all] Error 2

Error 2:
Performing configuration checks

    - 32-bit                   : no
    - 64-bit                   : no
    - arm                      : no
    - mips1                    : no
    - power                    : no
    - sparc                    : no
    - x86                      : no
    - combined                 : no
    - has_icu builds           : no
    - lockfree boost::atomic_flag : no

Yeah, when this is right, you should see 'yes' for 32-bit and arm.

FYI, I should be getting a 64-bit ARM soon and will see what changes are necessary there.

And if any of this helps and you do get it working, we should try to update the Android wiki page accordingly, either by fixing some of the instructions or with some side notes for these problems.

Tom

 

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