CrossCompiling

[adrenalingod]

Hay,

the program works and everything is fine but my next goal is to crosscompile it for aarch64.
I am using:

OS:
Description: Ubuntu 24.04.2 LTS
Codename: noble

IDE:
Eclipse for C/C++ developers

Cross Compiler:
gcc-aarch64-linux-gnu g++-aarch64-linux-gnu

I tried some things:
1.changed the main CMakeLists.txt
#SET(CMAKE_C_COMPILER /usr/bin/aarch64-linux-gnu-gcc)
#SET(CMAKE_CXX_COMPILER /usr/bin/aarch64-linux-gnu-g++)

-> rm -rf CMakeCache.txt CMakeFiles/

cmake is stuck in a loop and tells that the file has been changed.

2. Changed my main compiler
   export CC=/usr/bin/aarch64-linux-gnu-gcc
   export CXX=/usr/bin/aarch64-linux-gnu-g++

-> rm -rf CMakeCache.txt CMakeFiles/

cmake output:

-- The C compiler identification is GNU 13.3.0
-- The CXX compiler identification is GNU 13.3.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/aarch64-linux-gnu-gcc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/aarch64-linux-gnu-g++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at CMakeLists.txt:21 (find_package):
By not providing "FindSDL2.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "SDL2", but
CMake did not find one.

Could not find a package configuration file provided by "SDL2" with any of
the following names:

SDL2Config.cmake
sdl2-config.cmake

Add the installation prefix of "SDL2" to CMAKE_PREFIX_PATH or set
"SDL2_DIR" to a directory containing one of the above files. If "SDL2"
provides a separate development package or SDK, be sure it has been
installed.

It is my first time crosscompiling a bigger project.
What are the steps necessary to get it up and running?
I guess that all the used libraries are not working with an aarch compiler.
Do I have to somehow redownload every single library used and set up a second project specially for the the aarch display
Do I even need SDL for the Display? I read that is more for newer graphic cards.

Thanks for your input

[kisvegabor]

For cross compiling I suggest using https://github.com/lvgl/lv_port_linux/ which is a simpler CMake only repo. @AndreCostaaa can point you to the right direction if needed.