Cross compilation fails

[jbrea]

I'm trying to cross-compile ViZDoom 1.1.13 (see here), but it fails with errors

CMake Error at src/vizdoom/CMakeLists.txt:32 (include):
  include could not find requested file:

    IMPORTFILE-NOTFOUND

CMake Error at src/vizdoom/tools/lemon/CMakeLists.txt:17 (add_custom_command):
  No TARGET 'lemon' has been created in this directory.

Am I doing something wrong?

[Miffyli]

Pinging @mwydmuch as he is the wizard who understands all of this makefile stuff 🙃

[mwydmuch]

Hello @jbrea, ViZDoom doesn't officially support cross-compilation. There are some parts in CMakeFilles that suggest that someone used it for ZDoom, but it wasn't and still isn't documented. Personally, I've never tried to cross-compile ViZDoom.

Maybe there is a way to make cross-compilation work, but unfortunately, at the moment, I'm not sure if I'm able to help you. I suggest trying to create separate builds for Linux, macOS, and Windows using their target platforms to build them.

I checked the list of targets you tried to compile in your PR (long list), please note that ViZDoom won't compile for C++03 targets (only C++11 and higher are supported), ARM targets (this one was broken last time I checked, but we've never aimed to support it, and I will probably scrap ARM code, and work on compatibility for M1 later this year), and there is no support for FreeBSD and PowerPC.

[giordano]

please note that ViZDoom won't compile for C++03 targets

C++03 refers to GCC C++03 std::string ABI, which does not have anything to do with the standard of the source code.

[mwydmuch]

@giordano I haven't known about it, thank you. This makes a lot of sense.

[jbrea]

Thanks a lot for the feedback!

[mwydmuch]

Closing this issue due to lack of activity.

[StefanKarpinski]

This issue still exists though, no?

[mwydmuch]

I would assume the issue still exists, but it is something we don't plan to work on. (Vi)ZDoom was not really created with cross-compilation in mind, as it has rather complicated building system. Some elements of the building system build subprograms that generate sources for further steps of compilation. We never supported this way of building it. We compile for ViZDoom can be compiled for x86_x64 and ARM64 Linux and MacOS using docker and architecture emulation.