When building with -sENVIRONMENT=web, do not produce WASI'isms in the MINIMAL_RUNTIME build. #22502
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| // There does not currently exist a ENVIRONMENT_MAY_BE_WASI, so liken it to the shell environments. | ||
| // (e.g. anyone building with -sENVIRONMENT=web won't be running in WASI) | ||
| #if ENVIRONMENT_MAY_BE_NODE || ENVIRONMENT_MAY_BE_SHELL | ||
| '{{{ WASI_MODULE_NAME }}}': wasmImports, |
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I believe there are parts of the C library that depend on WASI-named syscalls.
We could perhaps see if any of the imports come from the WASI namespace and make this line conditional (for both minimal and regular runtime).
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Also, won't those that care about code size already fall into MINIFY_WASM_IMPORTED_MODULES above, avoiding this code block completely?
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Also, won't those that care about code size already fall into
MINIFY_WASM_IMPORTED_MODULESabove, avoiding this code block completely?
This only happens if METADCE is being run, which it isn't if ASYNCIFY is enabled.
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| // There does not currently exist a ENVIRONMENT_MAY_BE_WASI, so liken it to the shell environments. | ||
| // (e.g. anyone building with -sENVIRONMENT=web won't be running in WASI) | ||
| #if ENVIRONMENT_MAY_BE_NODE || ENVIRONMENT_MAY_BE_SHELL |
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This comment seems to imply a misunderstnading about how we use the WASI APIs in emscripten. The WASI APIs are like the regular __syscall_ functions that we implement in JS. They are just JS library functions like any other and can be used in any envrionment.
For example the __proc_exit function which is used to implement exit is a WASI API.
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That's a good point. I understand that in many cases the functions overlap. Although from the code size creep perspective that is not working out today, i.e. using that __proc_exit as an example, I am getting that in a build even when I build with -sEXIT_RUNTIME=0, so functionally that would warrant for a #if ENVIRONMENT_IS_WASI construct if there is no other way to avoid leaking in the unused stuff.
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We should be able to emit this line if and only the wasm module requires WASI imports. I think we can just look that the metadata from the wasm module to determine this and set and internal settings such as REQUIRES_WASI_IMPORTS based on that.
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