Yeah, that's an issue with wasm2c. It takes a few minutes to build (optimized) wasm-opt, and clang would be much worse, and maybe fail as you said.
I don't think anyone's looked into this, but ideas include: * Get wasm2c to emit separate files, each containing one or more functions. Then you just need a Makefile or such and can even build in parallel. * Write a little python script that splits up the file automatically. The format is pretty simple so that's easy. And the python could also run gcc/clang in a process pool for you. - Alon On Thu, Jul 9, 2020 at 1:01 PM 'Thomas Lively' via emscripten-discuss < [email protected]> wrote: > How does the wasm2c build work with something as large as LLVM? I would > assume that at some point the C file would get so large that the C compiler > would fall over. > > On Thu, Jul 9, 2020 at 12:58 PM Alon Zakai <[email protected]> wrote: > >> At the risk of sounding like a broken record - I've been talking about >> the next idea a lot recently ;) - I think this is something wasm2c can help >> with. I just gave a talk about how: >> >> http://kripken.github.io/talks/2020/universal.html#/ >> >> The idea is that we add a single additional build target, "universal C", >> which compiles LLVM and Binaryen to portable C code that can then be >> compiled on practically any platform. So this new "build" would be C, and >> people would download those C files and run a simple command to build them >> locally. After the local build you end up with a normal executable that >> just works. >> >> There is still that build step locally, but it's the simplest build >> possible - no build system is needed, no special local setup, no cmake or >> configure, just run gcc or clang on a self-contained C file. That should be >> trivial on ARM64 MacOS or Linux as I believe they have a system C compiler >> installed by default. >> >> I'm not opposed to adding "proper" ARM64 builds, though - ARM64 builds >> would have some benefits over wasm2c. But wasm2c builds do cover the long >> tail of less-common platforms, and we can probably set them up much quicker >> too. I hope to do this for Binaryen soon anyhow. >> >> - Alon >> >> On Thu, Jul 9, 2020 at 11:30 AM Brion Vibber <[email protected]> wrote: >> >>> I've been a bit of an ARM64 enthusiast of late, trying out Linux, >>> Windows 10, and iOS devices that run on the ARM64/Aarch64 family of >>> processors. Emscripten works fine on these machines if one cares to do some >>> light development work on them, but since there's no binaries built from >>> CI, the standard emsdk can only install by building from source -- which >>> can take hours on a middleweight portable machine. >>> >>> Now that Apple is switching their Mac product line to ARM64 processors >>> over the next two years, it will likely become much more common next year >>> for people to have ARM64-based laptop and desktop computers, and some of >>> them will need to build something with emscripten in their workflows either >>> on macOS or on a virtualized Linux in Docker etc. >>> >>> From what I've seen presented at WWDC, the ARM64 Macs will support >>> emulated processes, so it may work to ship the x86_64 binaries with the >>> caveat that they will run much slower than native builds. >>> >>> Virtualized Linux builds would also need native ARM64 binaries to run, >>> or else they'd have to sit there for a couple hours compiling after every >>> upgrade. >>> >>> And of course there are already Windows 10 and Linux computers available >>> with ARM64 processes, on sale since a couple years ago and used in the wild >>> in modest numbers. >>> >>> I get the impression that the biggest roadblock to explicit ARM64 >>> support in emscripten is getting it into the CI infrastructure: >>> * Linux/ARM64 builds and testing? >>> * macOS/ARM64 builds and testing? >>> * Windows/ARM64 builds and testing? >>> >>> It's too soon to start on macOS since it's in beta, dev kits aren't >>> shipped yet, and there's no obvious way yet to figure out how to run tests >>> on a macOS ARM system in CI. :) >>> >>> And I'm less sure how important Win/ARM64 is, given you can use the >>> Linux/ARM64 version in WSL virtualization. But some folks prefer to develop >>> on native Windows, too. >>> >>> If there's any way we can start talking about Linux/ARM64 builds and >>> testing, I would be very happy about it! I would even kick in a few bucks >>> for a VM or something if that would help any. ;) >>> >>> Thanks for your time and your consideration! >>> >>> -- brion vibber (brion @ pobox.com / brion @ wikimedia.org) >>> Wikimedia Foundation >>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "emscripten-discuss" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to [email protected]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/emscripten-discuss/CAFnWYT%3D3OLskq1KBtVrgKsq1PTS7eHDxyzpcBpmE8_Bfk7m6Kw%40mail.gmail.com >>> <https://groups.google.com/d/msgid/emscripten-discuss/CAFnWYT%3D3OLskq1KBtVrgKsq1PTS7eHDxyzpcBpmE8_Bfk7m6Kw%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "emscripten-discuss" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/emscripten-discuss/CAEX4NpQoi1LZiw2dPjeMMy2zSf-Z8WFWjpP8K1C-gEx67O5jwg%40mail.gmail.com >> <https://groups.google.com/d/msgid/emscripten-discuss/CAEX4NpQoi1LZiw2dPjeMMy2zSf-Z8WFWjpP8K1C-gEx67O5jwg%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- > You received this message because you are subscribed to the Google Groups > "emscripten-discuss" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/emscripten-discuss/CAJZD_EVjH_yPoWO3YC3NdjQOPx9xJbBh-kfbiB6xiVXcK378Mw%40mail.gmail.com > <https://groups.google.com/d/msgid/emscripten-discuss/CAJZD_EVjH_yPoWO3YC3NdjQOPx9xJbBh-kfbiB6xiVXcK378Mw%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. 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