undefined reference to 'libinput_device_touch_get_touch_count'

[biagiopietro]

Hello, I followed GETTING_STARTED.md but I got stuck when I carried out make -j`nproc`.

Commands history

Execution of cmake .., output:

puma@puma:~/dev/flutter-pi/build(master)$ sudo cmake ..
-- CMAKE_BUILD_TYPE not set, defaulting to Release.
-- The C compiler identification is GNU 7.5.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Generator .............. Unix Makefiles
-- Build Type ............. Release
-- Flutter Channel not set, defaulting to stable
-- Flutter Channel ........ stable
-- Engine SHA1 ............ ae90085a8437c0ae94d6b5ad2741739ebc742cb4
-- PKG_CONFIG_PATH ........ 
-- Found PkgConfig: /usr/bin/pkg-config (found version "0.29.1") 
-- Checking for module 'libdrm'
--   Found libdrm, version 2.4.101
-- Checking for module 'gbm'
--   Found gbm, version 20.0.8
-- Checking for module 'egl'
--   Found egl, version 20.0.8
-- Checking for module 'glesv2'
--   Found glesv2, version 20.0.8
-- Checking for module 'libsystemd'
--   Found libsystemd, version 237
-- Checking for module 'libinput'
--   Found libinput, version 1.10.4
-- Checking for module 'xkbcommon'
--   Found xkbcommon, version 0.8.2
-- Checking for module 'libudev'
--   Found libudev, version 237
-- Configuring done
-- Generating done
-- Build files have been written to: /home/puma/dev/flutter-pi/build

Execution of sudo make -j`nproc`, partial output:

[100%] Linking C executable flutter-pi
CMakeFiles/flutter-pi.dir/src/flutter-pi.c.o: In function `on_libinput_ready':
flutter-pi.c:(.text+0x1b2f): undefined reference to `libinput_device_touch_get_touch_count'
collect2: error: ld returned 1 exit status
CMakeFiles/flutter-pi.dir/build.make:282: recipe for target 'flutter-pi' failed
make[2]: *** [flutter-pi] Error 1
CMakeFiles/Makefile2:94: recipe for target 'CMakeFiles/flutter-pi.dir/all' failed
make[1]: *** [CMakeFiles/flutter-pi.dir/all] Error 2
Makefile:148: recipe for target 'all' failed
make: *** [all] Error 2

I got a lot of warning related to %lld as well, for instance:

/home/puma/dev/flutter-pi/src/plugins/omxplayer_video_player.c: In function ‘on_create’:
/home/puma/dev/flutter-pi/src/plugins/omxplayer_video_player.c:1111:56: warning: format ‘%lld’ expects argument of type ‘long long int’, but argument 4 has type ‘int64_t {aka long int}’ [-Wformat=]
         "flutter.io/omxplayerVideoPlayer/videoEvents%lld",
                                                     ~~~^
                                                     %ld
         player->player_id
         ~~~~~~~~~~~~~~~~~    

Inside the warnings list, I found also this:

[ 35%] Building C object CMakeFiles/flutter-pi.dir/src/compositor.c.o
/home/puma/dev/flutter-pi/src/flutter-pi.c: In function ‘on_libinput_ready’:
/home/puma/dev/flutter-pi/src/flutter-pi.c:1942:23: warning: implicit declaration of function ‘libinput_device_touch_get_touch_count’; did you mean ‘libinput_event_get_touch_event’? [-Wimplicit-function-declaration]
     int touch_count = libinput_device_touch_get_touch_count(device);
                       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                       libinput_event_get_touch_event

System setup

OS

puma@puma:~/dev/flutter-pi/build(master)$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.5 LTS
Release:	18.04
Codename:	bionic

cmake

puma@puma:~/dev/flutter-pi/build(master)$ cmake --version
cmake version 3.19.3

CMake suite maintained and supported by Kitware (kitware.com/cmake).

make

puma@puma:~/dev/flutter-pi/build(master)$ make --version
GNU Make 4.1
Built for x86_64-pc-linux-gnu
Copyright (C) 1988-2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law

I hope I have provided you with all the information you need.

Thanks in advance for your support.

[ardera]

The %lld errors are probably due to x86, I never tested that before. Should be an easy fix though (using inttypes.h)

The libinput_device_touch_get_touch_count is a function introduced in newer versions of libinput. Raspbian for example uses libinput 1.12.6, your system has 1.10.4. For now, it's best to work around that by compiling the latest version of libinput yourself. In the future, I can work around that and avoid the call to libinput_device_touch_get_touch_count since I don't strictly need it, but it does make things easier a bit which is why I used it initially.

[ardera]

First part of this issue should be resolved by #145