Clarification for some settings: are they for Asm.js or Wasm ?

[Gabriel Cuvillier]

Another technical question for today:

There is a couple of Emscripten settings for which it is not clear if
they have an impact/use on Wasm backend:

- DOUBLE_MODE

- PRECISE_F32

I suppose both of them are only useful for Asm.js, but this is not 100%
clear to me. So I just wanted to know :)

After a second look, it is possible some other settings are also only
relevant for Asm.js (I am thinking about
AGGRESSIVE_VARIABLE_ELIMINATION, INLINING_LIMIT, etc.), and maybe such
info shall be added in the comments (like it have been done recently for
the flags needed for link vs compile+link) ?

Cheers,

Gabriel

[Alon Zakai]

Good idea! I opened

https://github.com/emscripten-core/emscripten/pull/9949

All the ones you mentioned here are fastcomp-only, except for INLINING_LIMIT which definitely should affect closure's inlining, and should also affect LLVM (but we should probably check that, as I'm not sure).

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[Shachar Langbeheim]

Maybe the options should also be grouped, so that all the fast-comp options will be next to each other, and the same with the LLVM options? It will make the document significantly easier to go over.

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[Alon Zakai]

True, however, we'll be removing fastcomp at some point - hopefully not that far off - so maybe a large refactoring of the file would just help for a short time. I'm not opposed to it though.

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