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

[Dylan Baker]

cmake_prefix_path isn't like pkg_config_path, it expects to find an
installed prefix, on linux it expects to see something like
path_to_prefix/usr/{lib,bin}.

Dylan

Quoting Federico Dossena (2020-11-09 07:33:58)
> Thank you for your reply.
> 
> That's where I got stuck on Windows, I can't get it to find LLVM.
> 
> I built LLVM without problems for both x86 and x86_64 in 2 separate 
> folders, but when I try to build mesa, even with --cmake-prefix-path, it 
> doesn't find it, it always say "Neither a subproject directory nor a 
> llvm.wrap file was found".
> 
> I tried moving my LLVM files in the subprojects/llvm folder and that 
> didn't fix it, I don't know what to do.
> 
> Any suggestion?
> 
> On 2020-11-09 16:06, Jesse Natalie wrote:
> > 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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