Build action.

.github/workflows/dist.yml

@@ -9,5 +9,12 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - name: Placeholder
-      run: true
+    - uses: actions/checkout@v4
+
+    - name: Build artifact
+      run: ./build.sh
+
+    - name: Upload artifact
+      uses: actions/upload-artifact@v3
+      with:
+        path: dcraw.wasm.gz

.gitignore

@@ -0,0 +1,4 @@
+build*/
+libjpeg-turbo*/
+binaryen*/
+wasi-sdk*/

build.sh

@@ -0,0 +1,42 @@
+#!/bin/bash
+
+set -Eeuo pipefail
+
+JVER=3.0.1
+if [ ! -d "libjpeg-turbo-$JVER" ]; then
+  url="https://downloads.sourceforge.net/project/libjpeg-turbo/$JVER/libjpeg-turbo-$JVER.tar.gz"
+  curl -#L "$url" | tar xz
+fi
+
+BVER=version_116
+if [ ! -d "binaryen-$BVER" ]; then
+  url="https://github.com/WebAssembly/binaryen/releases/download/$BVER/binaryen-$BVER-x86_64-linux.tar.gz"
+  curl -#L "$url" | tar xz
+fi
+PATH="$PWD/binaryen-$BVER/bin:$PATH"
+
+WVER=20
+if [ ! -d "wasi-sdk-$WVER.0" ]; then
+  url="https://github.com/WebAssembly/wasi-sdk/releases/download/wasi-sdk-$WVER/wasi-sdk-$WVER.0-linux.tar.gz"
+  curl -#L "$url" | tar xz
+fi
+WASI_SDK_PREFIX="$PWD/wasi-sdk-$WVER.0"
+PATH="$WASI_SDK_PREFIX/bin:$PATH"
+
+mkdir -p build_wasm
+pushd build_wasm
+cmake "-DWASI_SDK_PREFIX=$WASI_SDK_PREFIX" "-DCMAKE_TOOLCHAIN_FILE=$WASI_SDK_PREFIX/share/cmake/wasi-sdk.cmake" \
+  -G"Unix Makefiles" "../libjpeg-turbo-$JVER" \
+  -D"CMAKE_C_FLAGS_RELEASE=-Oz -g0 -DNDEBUG" \
+  -D"WITH_SIMD=0" \
+  -D"WITH_TURBOJPEG=0"
+
+make -j jpeg-static
+clang --target=wasm32-wasi -g0 -flto \
+       -Oz -o dcraw.wasm ../dcraw.c -DNO_JASPER -DNO_LCMS \
+       -I. -I"../libjpeg-turbo-$JVER" \
+       CMakeFiles/jpeg*-static.dir/*.obj
+popd
+
+wasm-opt build_wasm/dcraw.wasm -O4 -o dcraw.wasm
+gzip -9f dcraw.wasm