[Mesa-dev] [EXTERNAL] Cross-compile from Linux to Windows

[Jesse Natalie]

Have you tried using Meson on Windows, instead of cross-compiling? If you run it from a Visual Studio command prompt, it should just work out of the box, at least for x86. I believe you'll need to use a cross file for amd64, but the only thing you'd need to specify is the host architecture.

Though I guess if you're building LLVMPipe you'll need to point it to LLVM. In my experience, adding "--cmake-prefix-path" to the Meson command line should work well.

-Jesse

-----Original Message-----
From: mesa-dev <mesa-dev-bounces at lists.freedesktop.org> On Behalf Of Federico Dossena
Sent: Saturday, November 7, 2020 4:14 AM
To: mesa-dev at lists.freedesktop.org
Subject: [EXTERNAL] [Mesa-dev] Cross-compile from Linux to Windows

I'm sorry to bother you in the dev list but it seems to be the only one with activity so it seems like the best place to ask.

I maintain some Mesa builds for Windows. These are builds of libgl-gdi with llvmpipe, for both x86 and x86_64; in other words, they're opengl32.dll files that users can drop into their game/application to have software rendering for OpenGL as a workaround for broken drivers or as a fallback for older systems.
I've always used scons on Windows and msvc as a compiler to make these builds, but now that scons is being deprecated I've been trying to use meson and ninja to cross-compile from Linux (amd64) to Windows (both x86 and x86_64) without much success. I can get regular Linux builds without issues though.

I tried reading the Mesa documentation on cross-compiling but it's very minimal and it's partially obsolete so I thought it would be best to ask you directly: how do I make these builds? Explain like I'm 5, basically.

Thanks,

Federico

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