Concerning warning compiling under Nerves

[lawik]

Is this something to worry about?

08:41:16.929 [warn]  The on_load function for module Elixir.Exqlite.Sqlite3NIF returned:
{:error,
 {:load_failed,
  'Failed to load NIF library: \'/home/lawik/projects/calendar_gadget/firmware/_build/rpi0_dev/lib/exqlite/priv/sqlite3_nif.so: wrong ELF class: ELFCLASS32\''}}

I haven't tried it yet, maybe it works, I'll update as I do.

[warmwaffles]

Need some details, is the system a 64 bit system or 32? because that is a 32 bit compiled ELF file. Looks like I need to get #165 done sooner rather than later.

[lawik]

Building for an Rpi0 in this case. Should be 32 bit.

Definitely ARM.

[lawik]

It seems to work fine ... :)

[LostKobrakai]

I just hit a similar warning. Maybe this is somehow cross compiling the NIF, but still trying to load it for the host system arch?

14:39:41.630 [warn]  The on_load function for module Elixir.Exqlite.Sqlite3NIF returned:
{:error,
 {:load_failed,
  'Failed to load NIF library: \'dlopen(/Users/benni/Work/erlang_solutions/Sparkmeter/edith/_build/radia_prod/lib/exqlite/priv/sqlite3_nif.so, 2): no suitable image found.  Did find:\n\t/Users/benni/Work/erlang_solutions/Sparkmeter/edith/_build/radia_prod/lib/exqlite/priv/sqlite3_nif.so: unknown file type, first eight bytes: 0x7F 0x45 0x4C 0x46 0x01 0x01 0x01 0x00\n\t/Users/benni/Work/erlang_solutions/Sparkmeter/edith/_build/radia_prod/lib/exqlite/priv/sqlite3_nif.so: stat() failed with errno=35\''}}

Edit: Seems like it's not working for me on the device, so might be something else.

[warmwaffles]

@LostKobrakai is it ARM32?

[LostKobrakai]

@warmwaffles yes. It's armv7

[warmwaffles]

Is that the same as a ARM Cortex-A72? I've got a spare raspberry pi compute module 4 that I've been needing to setup and I could probably use the push to make it happen.

[warmwaffles]

Ah no, it is "ARMv8-A" but I'll still get it setup regardless tonight and will do some poking.

[LostKobrakai]

The warning is from building the firmware, so no hardware needed, but I guess it's still good to be able to confirm it working on actual hardware as well.

[LostKobrakai]

I just setup a test nerves project and tried compiling for arm 32 (rpi) and arm 64 (rpi4) and got the same error for both.

[LostKobrakai]

I've put the example project on github. It seems on linux (CI) I get the error @lawik was talking about:
https://github.com/LostKobrakai/nerves_repro
https://github.com/LostKobrakai/nerves_repro/runs/3948776011#step:7:130

[warmwaffles]

I've cleaned up the make file some to have a more organized compilation output. But I still can not figure out why this is error. I'll look in to this more soon.

[RickCarlino]

Can confirm this is happening to us on a different Nerves project (RPi 3). Happy to provide extra info if needed, though the branch that uses exqlite is unstable at the moment.

[warmwaffles]

I can not figure out what is up with generating the wrong ELF type. For release 0.7.6 I make the Makefile follow closely to what circuits_gpio does and I can't get it to work.

Compiling circuits_gpio

mkdir -p /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/priv
mkdir -p /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/obj
/home/warmwaffles/.nerves/artifacts/nerves_toolchain_armv6_nerves_linux_gnueabihf-linux_x86_64-1.4.3/bin/armv6-nerves-linux-gnueabihf-gcc -c -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/erts-12.1.2/include -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/lib/erl_interface-5.1/include -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -pipe -O2 -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/include -DTARGET_RPI  -lbcm_host -fPIC -o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/obj/hal_sysfs.o src/hal_sysfs.c
/home/warmwaffles/.nerves/artifacts/nerves_toolchain_armv6_nerves_linux_gnueabihf-linux_x86_64-1.4.3/bin/armv6-nerves-linux-gnueabihf-gcc -c -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/erts-12.1.2/include -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/lib/erl_interface-5.1/include -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -pipe -O2 -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/include -DTARGET_RPI  -lbcm_host -fPIC -o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/obj/hal_sysfs_interrupts.o src/hal_sysfs_interrupts.c
/home/warmwaffles/.nerves/artifacts/nerves_toolchain_armv6_nerves_linux_gnueabihf-linux_x86_64-1.4.3/bin/armv6-nerves-linux-gnueabihf-gcc -c -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/erts-12.1.2/include -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/lib/erl_interface-5.1/include -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -pipe -O2 -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/include -DTARGET_RPI  -lbcm_host -fPIC -o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/obj/hal_rpi.o src/hal_rpi.c
/home/warmwaffles/.nerves/artifacts/nerves_toolchain_armv6_nerves_linux_gnueabihf-linux_x86_64-1.4.3/bin/armv6-nerves-linux-gnueabihf-gcc -c -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/erts-12.1.2/include -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/lib/erl_interface-5.1/include -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -pipe -O2 -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/include -DTARGET_RPI  -lbcm_host -fPIC -o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/obj/nif_utils.o src/nif_utils.c
/home/warmwaffles/.nerves/artifacts/nerves_toolchain_armv6_nerves_linux_gnueabihf-linux_x86_64-1.4.3/bin/armv6-nerves-linux-gnueabihf-gcc -c -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/erts-12.1.2/include -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/lib/erl_interface-5.1/include -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -pipe -O2 -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/include -DTARGET_RPI  -lbcm_host -fPIC -o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/obj/gpio_nif.o src/gpio_nif.c
/home/warmwaffles/.nerves/artifacts/nerves_toolchain_armv6_nerves_linux_gnueabihf-linux_x86_64-1.4.3/bin/armv6-nerves-linux-gnueabihf-gcc -o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/priv/gpio_nif.so -L/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/erts-12.1.2/lib -L/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/lib/erl_interface-5.1/lib -lerts -lei --sysroot=/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging -fPIC -shared /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/obj/hal_sysfs.o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/obj/hal_sysfs_interrupts.o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/obj/hal_rpi.o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/obj/nif_utils.o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/circuits_gpio/obj/gpio_nif.o

Compiling exqlite

mkdir -p /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/exqlite/priv
mkdir -p /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/exqlite/obj
/home/warmwaffles/.nerves/artifacts/nerves_toolchain_armv6_nerves_linux_gnueabihf-linux_x86_64-1.4.3/bin/armv6-nerves-linux-gnueabihf-gcc -c -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -pipe -O2 -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/include -I"/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/erts-12.1.2/include" -Ic_src -fPIC -fvisibility=hidden -DSQLITE_THREADSAFE=1 -DSQLITE_USE_URI=1 -DSQLITE_LIKE_DOESNT_MATCH_BLOBS=1 -DSQLITE_DQS=0 -DALLOW_COVERING_INDEX_SCAN=1 -DENABLE_FTS3_PARENTHESIS=1 -DENABLE_LOAD_EXTENSION=1 -DENABLE_SOUNDEX=1 -DENABLE_STAT4=1 -DENABLE_UPDATE_DELETE_LIMIT=1 -DSQLITE_ENABLE_FTS3=1 -DSQLITE_ENABLE_FTS4=1 -DSQLITE_ENABLE_FTS5=1 -DSQLITE_ENABLE_GEOPOLY=1 -DSQLITE_ENABLE_JSON1=1 -DSQLITE_ENABLE_MATH_FUNCTIONS=1 -DSQLITE_ENABLE_RBU=1 -DSQLITE_ENABLE_RTREE=1 -DSQLITE_OMIT_DEPRECATED=1 -DNDEBUG=1 -o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/exqlite/obj/sqlite3.o c_src/sqlite3.c
/home/warmwaffles/.nerves/artifacts/nerves_toolchain_armv6_nerves_linux_gnueabihf-linux_x86_64-1.4.3/bin/armv6-nerves-linux-gnueabihf-gcc -c -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64  -pipe -O2 -I/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/include -I"/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging/usr/lib/erlang/erts-12.1.2/include" -Ic_src -fPIC -fvisibility=hidden -DSQLITE_THREADSAFE=1 -DSQLITE_USE_URI=1 -DSQLITE_LIKE_DOESNT_MATCH_BLOBS=1 -DSQLITE_DQS=0 -DALLOW_COVERING_INDEX_SCAN=1 -DENABLE_FTS3_PARENTHESIS=1 -DENABLE_LOAD_EXTENSION=1 -DENABLE_SOUNDEX=1 -DENABLE_STAT4=1 -DENABLE_UPDATE_DELETE_LIMIT=1 -DSQLITE_ENABLE_FTS3=1 -DSQLITE_ENABLE_FTS4=1 -DSQLITE_ENABLE_FTS5=1 -DSQLITE_ENABLE_GEOPOLY=1 -DSQLITE_ENABLE_JSON1=1 -DSQLITE_ENABLE_MATH_FUNCTIONS=1 -DSQLITE_ENABLE_RBU=1 -DSQLITE_ENABLE_RTREE=1 -DSQLITE_OMIT_DEPRECATED=1 -DNDEBUG=1 -o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/exqlite/obj/sqlite3_nif.o c_src/sqlite3_nif.c
/home/warmwaffles/.nerves/artifacts/nerves_toolchain_armv6_nerves_linux_gnueabihf-linux_x86_64-1.4.3/bin/armv6-nerves-linux-gnueabihf-gcc -o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/exqlite/priv/sqlite3_nif.so --sysroot=/home/warmwaffles/.nerves/artifacts/nerves_system_rpi-portable-1.17.1/staging -fPIC -shared /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/exqlite/obj/sqlite3.o /home/warmwaffles/src/github.com/ecto/nerves_repro/_build/rpi_dev/lib/exqlite/obj/sqlite3_nif.o

[warmwaffles]

@RickCarlino I think we resolved it with this commit 57b872a

Was chatting with some other nerves people in the Elixir slack

jonjon: @ityonemo Also made a comment about this at NervesConf/ElixirConf as the warning being a thing with the host vs target process and was negligible. This is prob what he was talking about

jonjon: I’m going to guess because it does not autoload
jonjon: https://github.com/elixir-circuits/circuits_gpio/blob/main/lib/gpio/gpio_nif.ex#L3

So it's a known annoying thing. Looking at bcrypt_elixir it also does the same where autoload is disabled. So I think this will be fine.

[LostKobrakai]

Warning is gone and running the fw built works as well. So seems to be solved from my side.