[PATCH] D153293: [clang][WebAssembly] support wasm32-wasi shared libraries

[Joel Dice via Phabricator via llvm-commits]

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This adds support for Emscripten-style shared libraries [1] to the `wasm32-wasi`
target.  Previously, only static linking was supported, and the `-shared` and
`-fPIC` flags were simply ignored.  Now both flags are honored.

Since WASI runtimes do not necessarily include JavaScript support, we cannot
rely on the JS-based Emscripten linker to link shared libraries.  Instead, we
link them using the Component Model proposal [2].

We have prototyped shared library support in `wasi-sdk` [3] and put together a
demo [4] which uses a patched version of `wit-component` [5] to link libraries
using the Component Model.  We plan to submit the required changes upstream to
the respective repositories in the next week or two.

[1] https://github.com/WebAssembly/tool-conventions/blob/main/DynamicLinking.md
[2] https://github.com/WebAssembly/component-model/blob/main/design/mvp/examples/SharedEverythingDynamicLinking.md
[3] https://github.com/dicej/wasi-sdk/tree/dynamic-linking
[4] https://github.com/dicej/component-linking-demo
[5] https://github.com/bytecodealliance/wasm-tools/tree/main/crates/wit-component

Signed-off-by: Joel Dice <joel.dice at fermyon.com>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D153293

Files:
  clang/docs/ReleaseNotes.rst
  clang/lib/Driver/ToolChains/WebAssembly.cpp
  clang/test/Driver/wasm-toolchain.c
  llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
  llvm/utils/lit/lit/llvm/config.py

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