Ad-hoc support for the WASM backend #86
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for cross compilation (eg to WASM)
This isn't really WASI-specific; it should work for any platform that has `getentropy`.
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This PR adds support for the GHC WASM backend in an ad-hoc fashion by relying on
getentropyfrom the C standard library (as this is available in wasi-libc). There is nothing fundamentally WASM/WASI-specific about this; it works just as well on e.g. stock Linux.Additionally, we need to change the
build-typetoSimple, see #42.This is a draft PR only as skipping the custom setup is probably a non-starter.
A potentially more principled but invasive alternative would be to put the contents of this package in a separate
entropy-custom-setup, switchentropyto havebuild-type: Simple, have an opt-in flaguse-getentropythat, when enabled, uses the code added in this PR (apart fromhardwareRandom), and when disabled, defers toentropy-custom-setup.