How to run Asm.js In IE11, getting legacy_vm_support problem

Question

I complied faac.c and opus.c to asm.js. When I run asm.js in IE11, it throws an error message:

this is a legacy browser build with legacy_vm_support

I do not know whether IE11 support asm.js and how to work in IE11?

I complied faac.c and opus.c to asm.js. asm.js can run in edge、chrome and so on, but IE11 does not work, again:

this is a legacy browser build with legacy_vm_support

A quick Google search seems to suggest IE11 does not support asm.js out of the box. Maybe a polyfill exists? — Mathyn
– Mathyn, Commented May 24, 2019 at 9:04

Matteo Basso · Accepted Answer · 2019-05-24 11:54:40Z

1

As stated here, from version v1.38.1: 05/17/2018 you have to compile your code with -s LEGACY_VM_SUPPORT=1 to make it work in old browsers.

Breaking change: Emit WebAssembly by default. Only the default is changed - we of course still support asm.js, and will for a very long time. But changing the default makes sense as the recommended output for most use cases should be WebAssembly, given it has shipped in all major browsers and platforms and is more efficient than asm.js. Build with -s WASM=0 to disable wasm and use asm.js if you want that (or use -s LEGACY_VM_SUPPORT=1, which emits output that can run in older browsers, which includes a bunch of polyfills as well as disables wasm). (#6419)

answered May 24, 2019 at 11:54

Matteo Basso

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