First compiling version

.gitignore

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+llvm-build
+build

.gitmodules

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+[submodule "llvm"]
+	path = llvm
+	url = https://github.com/llvm/llvm-project.git

cmake/Platform/WASI.cmake

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+set(WASI 1)
+
+# This is a lie, but llvm needs it.
+set(UNIX 1)

compile.sh

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+#!/bin/bash
+
+set -xe
+
+WASI_SDK_PREFIX=${WASI_SDK_PATH:-/opt/wasi-sdk/}
+
+DIR=$PWD
+
+pushd llvm
+git checkout . 
+patch -p1 < ../llvm.patch
+popd
+
+$WASI_SDK_PREFIX/bin/clang++ -fno-exceptions -std=c++20 \
+  wasi_shim.cpp -O3 -c -o build/libwasishim.a
+
+
+rm -rf llvm-build
+mkdir -p llvm-build
+pushd llvm-build
+cmake ../llvm/llvm -G Ninja -DCMAKE_BUILD_TYPE=Release -DWASI_SDK_PREFIX=${WASI_SDK_PREFIX} \
+  -DCMAKE_TOOLCHAIN_FILE=${WASI_SDK_PREFIX}/share/cmake/wasi-sdk.cmake \
+  -DLLVM_TARGETS_TO_BUILD=WebAssembly -DLLVM_ENABLE_PROJECTS="clang;lld" \
+  -DLLVM_ENABLE_THREADS=OFF -DLLVM_INCLUDE_BENCHMARKS=OFF \
+  -DLLVM_DEFAULT_TARGET_TRIPLE=wasm32-wasi -DCMAKE_MODULE_PATH=$DIR/cmake \
+  -DCMAKE_CXX_FLAGS="-I$DIR -fno-exceptions" -DLLVM_INCLUDE_TESTS=OFF \
+  -DLLVM_BUILD_LLVM_DYLIB=OFF -DLLVM_INCLUDE_EXAMPLES=OFF -DLLVM_ENABLE_PIC=OFF \
+  -DLLVM_INCLUDE_UTILS=OFF -DLLVM_BUILD_UTILS=OFF -DLLVM_ENABLE_PLUGINS=OFF \
+  -DCLANG_PLUGIN_SUPPORT=OFF -DCMAKE_EXE_LINKER_FLAGS="-lwasishim -L$DIR/build"
+ninja
+popd