When cross compiling Python for ARM many of the extension modules are not build

However when compiling for the native platform the extension modules are properly build.

Cross Compilation Steps
=======================

CONFIG_SITE=config.site CC=arm-linux-gnueabihf-gcc CXX=arm-linux-gnueabihf-g++ AR=arm-linux-gnueabihf-ar RANLIB=arm-linux-gnueabihf-ranlib READELF=arm-linux-gnueabihf-readelf ./configure --enable-shared --host=arm-linux --build=x86_64-linux-gnu --disable-ipv6 --prefix=/opt/python3


make

sudo PATH=/home/benny/workspace/projects/webshield/src/dntl_ws/sw/toolchain/gcc-linaro-4.9-2016.02-x86_64_arm-linux-gnueabihf/bin:$PATH make install


Extension Modules Built when cross compiled
===========================================

building '_ctypes_test' extension
building 'cmath' extension
building '_json' extension
building '_testcapi' extension
building '_testbuffer' extension
building '_testimportmultiple' extension
building '_testmultiphase' extension
building '_lsprof' extension
building '_opcode' extension
building 'parser' extension
building 'mmap' extension
building 'audioop' extension
building '_crypt' extension
building '_csv' extension
building 'termios' extension
building 'resource' extension
building 'nis' extension
building '_multibytecodec' extension
building '_codecs_kr' extension
building '_codecs_jp' extension
building '_codecs_cn' extension
building '_codecs_tw' extension
building '_codecs_hk' extension
building '_codecs_iso2022' extension
building '_decimal' extension
building '_multiprocessing' extension
building 'ossaudiodev' extension
building 'xxlimited' extension
building '_ctypes' extension


Compilation Steps on x86 Machine
================================

CONFIG_SITE=config.site ./configure --enable-shared --disable-ipv6 --prefix=/opt/python3

make

sudo make install

Extension Modules Built when natively compiled
===========================================
building '_struct' extension
building '_ctypes_test' extension
building 'array' extension
building 'cmath' extension
building 'math' extension
building '_datetime' extension
building '_random' extension
building '_bisect' extension
building '_heapq' extension
building '_pickle' extension
building '_json' extension
building '_testcapi' extension
building '_testbuffer' extension
building '_testimportmultiple' extension
building '_testmultiphase' extension
building '_lsprof' extension
building 'unicodedata' extension
building '_opcode' extension
building 'fcntl' extension
building 'grp' extension
building 'spwd' extension
building 'select' extension
building 'parser' extension
building 'mmap' extension
building 'syslog' extension
building 'audioop' extension
building 'readline' extension
building '_crypt' extension
building '_csv' extension
building '_posixsubprocess' extension
building '_socket' extension
building '_sha256' extension
building '_sha512' extension
building '_md5' extension
building '_sha1' extension
building 'termios' extension
building 'resource' extension
building 'nis' extension
building 'binascii' extension
building 'pyexpat' extension
building '_elementtree' extension
building '_multibytecodec' extension
building '_codecs_kr' extension
building '_codecs_jp' extension
building '_codecs_cn' extension
building '_codecs_tw' extension
building '_codecs_hk' extension
building '_codecs_iso2022' extension
building '_decimal' extension
building '_multiprocessing' extension
building 'ossaudiodev' extension
building 'xxlimited' extension
building '_ctypes' extension

I've further tried building for ARM natively on ARM machine and the extensions was build successfully.

Tool chain used for cross compilation
=======================================

Using built-in specs.
COLLECT_GCC=arm-linux-gnueabihf-gcc
COLLECT_LTO_WRAPPER=/home/benny/workspace/projects/webshield/src/dntl_ws/sw/toolchain/gcc-linaro-4.9-2016.02-x86_64_arm-linux-gnueabihf/bin/../libexec/gcc/arm-linux-gnueabihf/4.9.4/lto-wrapper
Target: arm-linux-gnueabihf
Configured with: /home/tcwg-buildslave/workspace/tcwg-make-release/label/tcwg-x86_64-ex40/target/arm-linux-gnueabihf/snapshots/gcc-linaro-4.9-2016.02/configure SHELL=/bin/bash --with-bugurl=https://bugs.linaro.org --with-mpc=/home/tcwg-buildslave/workspace/tcwg-make-release/label/tcwg-x86_64-ex40/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu --with-mpfr=/home/tcwg-buildslave/workspace/tcwg-make-release/label/tcwg-x86_64-ex40/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu --with-gmp=/home/tcwg-buildslave/workspace/tcwg-make-release/label/tcwg-x86_64-ex40/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu --with-gnu-as --with-gnu-ld --disable-libstdcxx-pch --disable-libmudflap --with-cloog=no --with-ppl=no --with-isl=no --disable-nls --enable-c99 --with-tune=cortex-a9 --with-arch=armv7-a --with-fpu=vfpv3-d16 --with-float=hard --with-mode=thumb --disable-multilib --enable-multiarch --with-build-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release/label/tcwg-x86_64-ex40/target/arm-linux-gnueabihf/_build/sysroots/arm-linux-gnueabihf --enable-lto --enable-linker-build-id --enable-long-long --enable-shared --with-sysroot=/home/tcwg-buildslave/workspace/tcwg-make-release/label/tcwg-x86_64-ex40/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu/arm-linux-gnueabihf/libc --enable-languages=c,c++,fortran,lto --enable-checking=release --disable-bootstrap --with-bugurl=https://bugs.linaro.org --build=x86_64-unknown-linux-gnu --host=x86_64-unknown-linux-gnu --target=arm-linux-gnueabihf --prefix=/home/tcwg-buildslave/workspace/tcwg-make-release/label/tcwg-x86_64-ex40/target/arm-linux-gnueabihf/_build/builds/destdir/x86_64-unknown-linux-gnu
Thread model: posix
gcc version 4.9.4 20151028 (prerelease) (Linaro GCC 4.9-2016.02) 


Host Machine
=============
Ubuntu 16.04.1 LTS 

Linux whachamacallit 4.4.0-42-generic #62-Ubuntu SMP Fri Oct 7 23:11:45 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux