cross compile cli to armhf

[thomas-mc-work]

Hello,

how can I cross compile the cli sub project to the armhf platform (Raspberry Pi 1)? What I've tried:

HOSTOS=LINUX MACHINE=aarch64 make all

But it still builds for my host machine (X86_64).

I'm grateful for every hint!

[thomas-mc-work]

I've gotten a bit further and managed to compile the source files to objects. But the linker is producing some errors:

/usr/bin/ld: (.text+0x66e): undefined reference to `udev_device_get_sysattr_value'
/usr/bin/ld: ../libs/Linux_arm/libhidapi-hidraw.a(hid.o): in function `hid_enumerate':
(.text+0x9a8): undefined reference to `udev_new'
/usr/bin/ld: (.text+0x9b4): undefined reference to `udev_enumerate_new'
/usr/bin/ld: (.text+0x9be): undefined reference to `udev_enumerate_add_match_subsystem'
/usr/bin/ld: (.text+0x9c4): undefined reference to `udev_enumerate_scan_devices'
/usr/bin/ld: (.text+0x9ca): undefined reference to `udev_enumerate_get_list_entry'
/usr/bin/ld: (.text+0xa00): undefined reference to `udev_list_entry_get_name'
/usr/bin/ld: (.text+0xa62): undefined reference to `udev_device_new_from_syspath'
/usr/bin/ld: (.text+0xa72): undefined reference to `udev_device_unref'
/usr/bin/ld: (.text+0xa78): undefined reference to `udev_list_entry_get_next'
/usr/bin/ld: (.text+0xa88): undefined reference to `udev_enumerate_unref'
/usr/bin/ld: (.text+0xa8e): undefined reference to `udev_unref'
/usr/bin/ld: (.text+0xacc): undefined reference to `udev_enumerate_unref'
/usr/bin/ld: (.text+0xad2): undefined reference to `udev_unref'
/usr/bin/ld: ../libs/Linux_arm/libhidapi-hidraw.a(hid.o): in function `hid_get_device_info':
(.text+0xfdc): undefined reference to `udev_new'
/usr/bin/ld: (.text+0xfea): undefined reference to `udev_device_new_from_devnum'
/usr/bin/ld: (.text+0xffc): undefined reference to `udev_device_unref'
/usr/bin/ld: (.text+0x1002): undefined reference to `udev_unref'
/usr/bin/ld: ../libs/Linux_arm/libusb-1.0.a(linux_udev.o): in function `udev_hotplug_event':
(.text+0x22): undefined reference to `udev_device_get_action'
/usr/bin/ld: (.text+0x3c): undefined reference to `udev_device_get_devnode'
/usr/bin/ld: (.text+0x4a): undefined reference to `udev_device_get_sysname'
/usr/bin/ld: (.text+0x72): undefined reference to `udev_device_unref'
/usr/bin/ld: ../libs/Linux_arm/libusb-1.0.a(linux_udev.o): in function `linux_udev_event_thread_main':
(.text+0x1f6): undefined reference to `udev_monitor_receive_device'
/usr/bin/ld: ../libs/Linux_arm/libusb-1.0.a(linux_udev.o): in function `linux_udev_start_event_monitor':
(.text+0x2c8): undefined reference to `udev_new'
/usr/bin/ld: (.text+0x2d8): undefined reference to `udev_monitor_new_from_netlink'
/usr/bin/ld: (.text+0x2ec): undefined reference to `udev_monitor_filter_add_match_subsystem_devtype'
/usr/bin/ld: (.text+0x2f8): undefined reference to `udev_monitor_enable_receiving'
/usr/bin/ld: (.text+0x308): undefined reference to `udev_monitor_get_fd'
/usr/bin/ld: (.text+0x3ca): undefined reference to `udev_monitor_unref'
/usr/bin/ld: (.text+0x3e2): undefined reference to `udev_unref'
/usr/bin/ld: ../libs/Linux_arm/libusb-1.0.a(linux_udev.o): in function `linux_udev_stop_event_monitor':
(.text+0x582): undefined reference to `udev_monitor_unref'
/usr/bin/ld: (.text+0x58c): undefined reference to `udev_unref'
/usr/bin/ld: ../libs/Linux_arm/libusb-1.0.a(linux_udev.o): in function `linux_udev_scan_devices':
(.text+0x652): undefined reference to `udev_enumerate_new'
/usr/bin/ld: (.text+0x662): undefined reference to `udev_enumerate_add_match_subsystem'
/usr/bin/ld: (.text+0x672): undefined reference to `udev_enumerate_add_match_property'
/usr/bin/ld: (.text+0x67a): undefined reference to `udev_enumerate_scan_devices'
/usr/bin/ld: (.text+0x682): undefined reference to `udev_enumerate_get_list_entry'
/usr/bin/ld: (.text+0x692): undefined reference to `udev_list_entry_get_name'
/usr/bin/ld: (.text+0x6a4): undefined reference to `udev_device_new_from_syspath'
/usr/bin/ld: (.text+0x6aa): undefined reference to `udev_device_get_devnode'
/usr/bin/ld: (.text+0x6b4): undefined reference to `udev_device_get_sysname'
/usr/bin/ld: (.text+0x6ea): undefined reference to `udev_device_unref'
/usr/bin/ld: (.text+0x6f0): undefined reference to `udev_list_entry_get_next'
/usr/bin/ld: (.text+0x6fe): undefined reference to `udev_enumerate_unref'
/usr/bin/ld: ../libs/Linux_arm/libusb-1.0.a(linux_udev.o): in function `linux_udev_hotplug_poll':
(.text+0x7a8): undefined reference to `udev_monitor_receive_device'
/usr/bin/ld: (.text+0x7c6): undefined reference to `udev_monitor_receive_device'

I couldn't find any explanations for that in the internet. So hopefully someone knows how to tackle this.

[chewitt]

This is how LE builds it: https://github.com/LibreELEC/LibreELEC.tv/blob/master/packages/addons/tools/flirc_util/package.mk

[thomas-mc-work]

Thank you very much for the hint @chewitt! Sadly I get the same errors with their command.