rust, WebAssembly, and passing arguments for increased total memory
I have a rust project I am compiling to webasm per http://asquera.de/blog/2017-04-10/the-path-to-rust-on-the-web/
Project compiles. When I run it in Chrome Canary, it runs out of memory and gives me a very helpful error message:
abort("Cannot enlarge memory arrays. Either (1) compile with -s
TOTAL_MEMORY=X with X higher than the current value 16777216, (2) compile
with -s ALLOW_MEMORY_GROWTH=1 which allows increasing the size at runtime,
...
Problem is, its not clear how to pass those flags to rustc / the build tool chain.
Neither setting EMMAKEN_CFLAGS or the following work:
cargo rustc -v --target=wasm32-unknown-emscripten --release -- -Clink-args="-s TOTAL_MEMORY=33554432"
This blog post offers a solution that I think can be applied in your case too:
As best as I can tell there is no way to pass most linker arguments through cargo. Instead, hack around the limitation by specifying a custom linker that is actually a shell script wrapping the real linker.
Create a shell script like emcc_link that calls emscripten with the appropriate options:
emcc "-s" "TOTAL_MEMORY=33554432" $@
(You may need other options to make it work. Check the blog post for details.)
And specify to use it for your project by editing/creating .cargo/config :
[target.wasm32-unknown-emscripten]
linker = "/your/project/dir/emcc_sdl"
[target.asmjs-unknown-emscripten]
linker = "/your/project/dir/emcc_sdl"
I ruthlessly assumed the build environment is Linux or the like. On Windows the shell script should probably be a batch script and I'm not sure if there are any differences in .cargo/config .
Disclaimer: I have not tried any of this.
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