Fix github release build failure

[csyonghe]

Need to fix the rhi/dawn issue:

/usr/lib/gcc-cross/aarch64-linux-gnu/9/../../../../aarch64-linux-gnu/bin/ld: _deps/dawn-src/lib64/libdawn.so: error adding symbols: file in wrong format

We should consider just build libdawn.so for aarch64.

Please note that this issue needs to be fixed as P0 since it is blocking us from creating a release.

[aleino-nv]

Why don't we just disable WebGPU for non-Windows platforms, for the time being? I thought that was the original plan?

[aleino-nv]

Also, I had the impression that @skallweitNV was working on this. (?)

[aleino-nv]

@skallweitNV Tells me the plan is to disable WebGPU backend on Linux, for now.

[westlicht]

Yes, that's the immediate fix in #5186. However, the correct fix will be to use a proper cmake toolchain file to cross-compile slang for linux/aarch64. This will correctly set the CMAKE_SYSTEM_PROCESSOR variable that slang-rhi depends on to select the correct dawn library. I have already setup the full build matrix for dawn binaries. So once the slang side is fixed, we can enable all builds again.

[aleino-nv]

Given

We should consider just build libdawn.so for aarch64.

and

I have already setup the full build matrix for dawn binaries

I'll assign this to @skallweitNV, then.

[csyonghe]

Slang's current cmake support already include Linux aarch64 builds.

[bmillsNV]

@skallweitNV what's left for this one? Do we still have a build failure?

[skallweitNV]

The release build works. For now WebGPU is disabled for Linux builds. In slang-rhi everything is done to support Linux for both x86_64 and aarch64 platforms. To get it all working the slang project needs to setup proper cmake cross-compilation for linux/aarch64 using a cmake toolchain file. Then we can re-enable WebGPU for Linux by removing this block: https://github.com/shader-slang/slang/blob/master/external/CMakeLists.txt#L74

[bmillsNV]

@aleino-nv could you add the the cmake item to your list?

[aleino-nv]

@bmillsNV This stuff is usually a bit of a time sink, at least for me -- is this really a priority?

That is to say, do we really need to support running our own Slang/WGSL test apps natively on mobile devices right now? At least this should have no impact on the demo we're working on.

[csyonghe]

@westlicht we use native asrch64 machine in the ci to create a slang release for Linux aarch64. Doesn't slang-rhi support native aarch64 build?

[csyonghe]

Closing as done.