I have followed the directions ros2 on arm architecture and everything builds successfully. So I change the Path to my desired toolchain and set CROSS_COMPILATION=arm-linux-gnueabihf- and it fails on

Starting >>> examples_rclcpp_minimal_publisher
--- stderr: examples_rclcpp_minimal_client                                                                                                                                               
CMake Warning at ros2_arm_ws/install/rmw_implementation/share/rmw_implementation/cmake/ament_cmake_export_libraries-extras.cmake:116 (message):
  Package 'rmw_implementation' exports library 'pthread' which couldn't be
  found

/opt/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.3.1/../../../../arm-linux-gnueabihf/bin/ld: warning: libfastcdr.so.1.0.7, needed by /ros2_arm_ws/install/rcl_interfaces/lib/librcl_interfaces__rosidl_typesupport_fastrtps_c.so, not found (try using -rpath or -rpath-link)s/ros2_arm_ws/install/rcl_interfaces/lib/librcl_interfaces__rosidl_typesupport_fastrtps_c.so: undefined reference to `eprosima::fastcdr::Cdr::deserialize(char&)'
/ros2_arm_ws/install/rcl_interfaces/lib/librcl_interfaces__rosidl_typesupport_fastrtps_cpp.so: undefined reference to `eprosima::fastcdr::Cdr::serializeBoolSequence(std::vector<bool, std::allocator<bool> > const&)'

I eventually got it to work, but I did have a lot of warnings

/opt/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.3.1/../../../../arm-linux-gnueabihf/bin/ld: /home/colas/ros2_arm_ws/install/lib/libnav_msgs__rosidl_typesupport_c.so: invalid string offset 3675 >= 3578 for section `.strtab'
/opt/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.3.1/../../../../arm-linux-gnueabihf/bin/ld: /home/colas/ros2_arm_ws/install/lib/libnav_msgs__rosidl_typesupport_c.so: invalid string offset 3663 >= 3578 for section `.strtab'
/opt/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.3.1/../../../../arm-linux-gnueabihf/bin/ld: /home/colas/ros2_arm_ws/install/lib/libnav_msgs__rosidl_typesupport_c.so: invalid string offset 3664 >= 3578 for section `.strtab'
/opt/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.3.1/../../../../arm-linux-gnueabihf/bin/ld: /home/colas/ros2_arm_ws/install/lib/libnav_msgs__rosidl_typesupport_c.so: invalid string offset 3649 >= 3578 for section `.strtab'
/opt/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.3.1/../../../../arm-linux-gnueabihf/bin/ld: /home/colas/ros2_arm_ws/install/lib/libnav_msgs__rosidl_typesupport_c.so: invalid string offset 3683 >= 3578 for section `.strtab'
/opt/gcc-linaro-7.3.1-2018.05-x86_64_arm-linux-gnueabihf/bin/../lib/gcc/arm-linux-gnueabihf/7.3.1/../../../../arm-linux-gnueabihf/bin/ld: /home/colas/ros2_arm_ws/install/lib/libnav_msgs__rosidl_typesupport_c.so: invalid string offset 3637 >= 3578 for section `.strtab'


Finished <<< map_msgs [31.9s]

Summary: 129 packages finished [7min 32s]
  99 packages had stderr output: actionlib_msgs ament_cmake ament_cmake_auto ament_cmake_clang_format ament_cmake_copyright ament_cmake_core ament_cmake_cppcheck ament_cmake_cpplint ament_cmake_export_definitions ament_cmake_export_dependencies ament_cmake_export_include_directories ament_cmake_export_interfaces ament_cmake_export_libraries ament_cmake_export_link_flags ament_cmake_flake8 ament_cmake_gmock ament_cmake_gtest ament_cmake_include_directories ament_cmake_libraries ament_cmake_lint_cmake ament_cmake_nose ament_cmake_pclint ament_cmake_pep257 ament_cmake_pep8 ament_cmake_pyflakes ament_cmake_pytest ament_cmake_python ament_cmake_ros ament_cmake_target_dependencies ament_cmake_test ament_cmake_uncrustify ament_index_cpp ament_lint_auto ament_lint_common builtin_interfaces class_loader common_interfaces console_bridge diagnostic_msgs example_interfaces examples_rclcpp_minimal_client examples_rclcpp_minimal_composition examples_rclcpp_minimal_publisher examples_rclcpp_minimal_service examples_rclcpp_minimal_subscriber examples_rclcpp_minimal_timer fastcdr fastrtps fastrtps_cmake_module geometry_msgs gmock_vendor gtest_vendor libyaml_vendor lifecycle_msgs map_msgs nav_msgs osrf_testing_tools_cpp pluginlib poco_vendor rcl rcl_interfaces rcl_lifecycle rcl_yaml_param_parser rclcpp rclcpp_lifecycle rcutils rmw rmw_fastrtps_cpp rmw_implementation rmw_implementation_cmake ros_environment rosgraph_msgs rosidl_cmake rosidl_default_generators rosidl_default_runtime rosidl_generator_c rosidl_generator_cpp rosidl_generator_dds_idl rosidl_parser rosidl_typesupport_c rosidl_typesupport_cpp rosidl_typesupport_interface rosidl_typesupport_introspection_c rosidl_typesupport_introspection_cpp rttest sensor_msgs shape_msgs std_msgs std_srvs stereo_msgs test_osrf_testing_tools_cpp tinyxml2_vendor tinyxml_vendor tlsf tlsf_cpp trajectory_msgs uncrustify_vendor urdfdom_headers visualization_msgs