Cannot execute Mach-O 64-bit executable x86_64 binary inside docker container

Question

I have an IL2CPP scripting backend Unity Android export taken from Unity editor version 2020.3.48f1 (Mac intel variant on Mac m1 machine) for target architecture ARM64.

When I try executing il2cpp binary file (located at unityLibrary/src/main/Il2CppOutputProject/IL2CPP/build/deploy/netcoreapp3.1) locally, it runs just file -

MacBook-Pro netcoreapp3.1 % ./il2cpp 

Options:
  --emit-null-checks                              Enables generation of null checks
...

file command output (ran locally) is -

MacBook-Pro netcoreapp3.1 % file il2cpp
il2cpp: Mach-O 64-bit executable x86_64

Now I am trying to build the Android export project inside docker using base image amazoncorretto:17 (ran with --platform linux/amd64 option ie. docker container architecture is x86_64 same as il2cpp binary file) but I keep getting error -

bash-4.2# ./il2cpp
bash: ./il2cpp: cannot execute binary file

file command output (ran inside docker container) is -

sh-4.2# file il2cpp
il2cpp: Mach-O 64-bit executable

x86_64 is missing in above output (as opposed to when I run it on my host machine) but I don't know if its relevant.

Architecture of both docker container and file is same (both are x86_64).

Question: How can I run il2cpp (and complete Unity export Android build) in a docker image (preferably any version of amazoncorretto)?

I cannot figure out why the executable runs locally but not inside docker container.

Note: I ran my Mac generated il2cpp inside same base docker image on a linux host but it gives same error.

Any help is appreciated.

Thanks

MacOS and Linux are different operating systems. There are no MacOS-native containers; Docker Desktop works by running a hidden Linux VM. You probably need to compile this tool on Linux, maybe via a multi-stage Dockerfile. — David Maze
– David Maze, Commented Jul 16, 2023 at 20:55

aquaman · Accepted Answer · 2023-07-16 21:07:16Z

0

As pointed out in comments, the reason why binary was not executing inside a linux container because it was built on mac.

By exporting Unity project on ubuntu machine and using it inside amazoncorretto:17 docker container (on ubuntu machine as well), the script started executing.

answered Jul 16, 2023 at 21:07

aquaman

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