Dockerfile

# syntax=docker/dockerfile:1

FROM emscripten/emsdk:3.1.35

ENV GRAPHVIZ_VERSION=8.0.1
ENV EXPAT_VERSION=2.5.0
ENV USE_CLOSURE=0

WORKDIR /home/build/deps

RUN EXPAT_SOURCE_URL="https://github.com/libexpat/libexpat/releases/download/R_$(echo ${EXPAT_VERSION} | tr . _)/expat-${EXPAT_VERSION}.tar.xz"; \
  curl --fail --location "$EXPAT_SOURCE_URL" | tar -xJ
RUN mv expat-${EXPAT_VERSION} expat
WORKDIR expat
RUN	grep -q ${EXPAT_VERSION} expat_config.h
RUN emconfigure ./configure \
  --disable-shared \
  --prefix=/home/build \
  --libdir=/home/build/lib \
  CFLAGS="-Oz -w -flto" LDFLAGS="-Oz -s -flto"
RUN emmake make -j -C lib all install
WORKDIR ..

RUN GRAPHVIZ_SOURCE_URL="https://gitlab.com/api/v4/projects/4207231/packages/generic/graphviz-releases/${GRAPHVIZ_VERSION}/graphviz-${GRAPHVIZ_VERSION}.tar.xz"; \
  curl --fail --location "$GRAPHVIZ_SOURCE_URL" | tar -xJ
RUN mv "graphviz-${GRAPHVIZ_VERSION}" graphviz
WORKDIR graphviz
RUN grep -q "${GRAPHVIZ_VERSION}" graphviz_version.h
RUN emconfigure ./configure \
	--without-sfdp \
  --disable-ltdl \
  --enable-static \
  --disable-shared \
  --prefix=/home/build \
  --libdir=/home/build/lib \
  CFLAGS="-Oz -w -flto" LDFLAGS="-Oz -s -flto"

RUN emmake make -j lib plugin
RUN emmake make -j -C lib install
RUN emmake make -j -C plugin install
WORKDIR ..

WORKDIR /home

CMD	emcc \
  -I/home/build/include \
  -I/home/build/include/graphviz \
  -L/home/build/lib \
  -L/home/build/lib/graphviz \
  -lgvplugin_core \
  -lgvplugin_dot_layout \
  -lcgraph \
  -lgvc \
  -lgvpr \
  -lpathplan \
  -lexpat \
  -lxdot \
  -lcdt \
  -g1 -Oz -flto \
  --bind \
  --no-entry \
  --closure ${USE_CLOSURE} \
  -s ALLOW_MEMORY_GROWTH=1 \
  -s DYNAMIC_EXECUTION=0 \
  -s SINGLE_FILE \
  -s WASM_ASYNC_COMPILATION=0 \
  -s ENVIRONMENT=worker \
  -s FILESYSTEM=0 \
  -s STRICT=1 \
  -s DEFAULT_TO_CXX \
  -s ALLOW_UNIMPLEMENTED_SYSCALLS \
  -s TEXTDECODER=2 \
  -s MODULARIZE=0 \
  -s INCOMING_MODULE_JS_API=[] \
  -o tmp.js \
  --post-js worker/post.js \
  worker/viz.cpp ; \
node worker/bundle.js < tmp.js > worker-dist/voyager.worker.js