Initial wasm support

emscripten-build-llvm.sh

@@ -0,0 +1,72 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+INSTALL_DIR="${PWD}/llvm18.0-emscripten"
+mkdir -p ${INSTALL_DIR}
+
+./clone-llvm.sh
+
+# Build LLVM, clang
+cd llvm-project
+
+# Check if EMSDK_ROOT is defined
+if [ -z "$EMSDK_ROOT" ]; then
+    echo "Error: EMSDK_ROOT is not defined."
+    echo "Please set the EMSDK_ROOT environment variable to the root directory of your Emscripten SDK."
+    exit 1
+fi
+
+source ${EMSDK_ROOT}/emsdk_env.sh
+
+LLVM_SRC=$(pwd)
+LLVM_SRC=$(realpath "$LLVM_SRC")
+LLVM_NATIVE=$LLVM_SRC/build-native
+LLVM_WASM=$LLVM_SRC/build-wasm
+
+# Cross compiling llvm needs a native build of "llvm-tblgen" and "clang-tblgen"
+if [ ! -d $LLVM_NATIVE/ ]; then
+    cmake -G Ninja \
+        -S $LLVM_SRC/llvm/ \
+        -B $LLVM_NATIVE/ \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DLLVM_TARGETS_TO_BUILD=WebAssembly \
+        -DLLVM_ENABLE_PROJECTS="clang"
+fi
+cmake --build $LLVM_NATIVE/ -- llvm-tblgen clang-tblgen llvm-config
+
+if [ ! -d $LLVM_WASM/ ]; then
+    EMCC_DEBUG=2 \
+    CXXFLAGS="-Dwait4=__syscall_wait4" \
+    LDFLAGS="-lnodefs.js -s NO_INVOKE_RUN -s EXIT_RUNTIME -s INITIAL_MEMORY=64MB -s ALLOW_MEMORY_GROWTH -s \
+        EXPORTED_RUNTIME_METHODS=FS,callMain,NODEFS -s MODULARIZE -s EXPORT_ES6 -s WASM_BIGINT" \
+    emcmake cmake -G Ninja \
+        -S $LLVM_SRC/llvm/ \
+        -B $LLVM_WASM/ \
+        -DCMAKE_BUILD_TYPE=Release \
+        -DLLVM_TARGETS_TO_BUILD='RISCV' \
+        -DLLVM_ENABLE_PROJECTS="clang;lld" \
+        -DLLVM_ENABLE_DUMP=OFF \
+        -DLLVM_ENABLE_ASSERTIONS=OFF \
+        -DLLVM_ENABLE_EXPENSIVE_CHECKS=OFF \
+        -DLLVM_ENABLE_BACKTRACES=OFF \
+        -DLLVM_BUILD_TOOLS=OFF \
+        -DLLVM_ENABLE_THREADS=OFF \
+        -DLLVM_BUILD_LLVM_DYLIB=OFF \
+        -DLLVM_INCLUDE_TESTS=OFF \
+        -DLLVM_ENABLE_TERMINFO=Off \
+        -DLLVM_ENABLE_LIBXML2=Off \
+        -DLLVM_ENABLE_ZLIB=Off \
+        -DLLVM_ENABLE_ZSTD=Off \
+        -DLLVM_TABLEGEN=$LLVM_NATIVE/bin/llvm-tblgen \
+        -DCLANG_TABLEGEN=$LLVM_NATIVE/bin/clang-tblgen \
+        -DCMAKE_INSTALL_PREFIX=${INSTALL_DIR}/
+fi
+
+cmake --build $LLVM_WASM/
+cmake --install $LLVM_WASM/
+
+cp $LLVM_NATIVE/bin/llvm-config $INSTALL_DIR/bin
+
+echo ""
+echo "success"