Compile Dolphin on a x86 machine for a x64 machine

[xenoxis]

Hello, i'm trying to compile Dolphin on my Linux (Ubuntu) i386 server for a gaming PC with Xubuntu on x64 system.

But i can't compile with the JIT64, cause i'm trying to build on a x86 system (it say that my pointers are 4bytes lengths etc etc...). I can only make a build without JIT (thing that i don't want obviously).

I wonder how can i make a "cross-compilation" for a x64 system ?
I know that gcc can take the

Code:

-m64

command line option, but how to pass it to the cmake script and go through all checks to detect an i386 platform ?


Hope that you'll help me,
Thanks

[AnyOldName3]

I don't know if this is the case for Dolphin, but usually when cross-compiling with CMake you'd specify a toolchain file that pointed to the correct tools and their arguments.

[KHg8m3r]

Why can't you just compile on the Xubuntu system? If you use the command "make -j$(nproc)" it'll use all your threads for faster compilation

[xenoxis]

(10-15-2020, 02:32 AM)KHg8m3r Wrote: Why can't you just compile on the Xubuntu system? If you use the command "make -j$(nproc)" it'll use all your threads for faster compilation

My Xubuntu system is dedicated to games only, i don't want to install all librairies and softs required to compile.
On the other hand, my server has this purpose, it have a very large amounts of libs and softs for a large panels of compilations.
Moreover, with my server, i can change compilation options to optimise a specific soft for ones pc that i have, and share them with samba server.

[KHg8m3r]

I thought of a couple things you could try:

Option 1:
Forcing it on the server? I'm probably missing something but from what I can Google, this should be what you need:
-Install the gcc-multilib if not already installed: sudo apt install gcc-multilib
-Follow the Dolphin build steps: https://wiki.dolphin-emu.org/index.php?title=Building_Dolphin_on_Linux and/or the build steps for portable Dolphin https://github.com/dolphin-emu/dolphin#linux-portable-build-steps
--When you get to the cmake step add the flag: -DCMAKE_C_FLAGS -m64 (or maybe -DCMAKE_CXX_FLAGS -m64)
--I don't know what other flags you might need

Option 2:
Reinstall the server as x64. It's way easier to compile stuff for x86_32 on x86_64 than the other way around. Unless your server is old and only has x86_32 hardware.....

Option 3:
Run a VM or docker/container on the server that is x64 (if you have VT stuff turned on in your BIOS and you're running on x86_64 hardware, this should be doable in QEMU or VMware Player). Or run a VM/docker/container on the gaming computer and delete it after.

Option 4:
Just install the required libraries on your Xubuntu machine. This won't affect your ability to play games. Dolphin's requirements don't take up a lot of space.

Option 5:
Use the Snap craft version: https://snapcraft.io/dolphin-emulator. I have no idea how well this would work, how often it's updated, what other libraries you'd need to run Snaps, how well it's supported, or if you'll encounter specific problems with using the Snap vs your own compiled version. You'll also probably have problems getting support for it on these forums since it's "maintained" by someone else and is an unofficial release.