Targeting wasm64?

[Jeru Sanders]

How can libskia.a be built targeting wasm64/memory64?

Adding "-s MEMORY64=1" to the extra_cflags in the gn args seems to mostly work. But at the link phase it complains about needing -mwasm64

If you hack in -mwasm64, then it complains about not being able to mix 32bit and 64bit wasm files. Specifically about skia/third_party/externals/emsdk/upstream/emscripten/cache/sysroot/lib/wasm32-emscripten/libz.a(adler32c.o)

It seems like this would work if I kept hacking the build scripts, but, is there a better way?

[Brian Osman]

I think continuing to hack is the answer, unfortunately. I don't believe we've ever worked on doing a wasm64 target (just wasm32), so none of the build scripts have those options.

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