Dockerfile

ARG EMSCRIPTEN_VERSION=3.1.26
FROM emscripten/emsdk:${EMSCRIPTEN_VERSION}
ARG CMAKE_VERSION=3.25.1
RUN apt update \
    && apt remove cmake -y \
    && apt install gpg -y \
    && mkdir -p /src \
    && cd /src \
    && wget https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-linux-x86_64.sh \
    && wget https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-SHA-256.txt.asc \
    && wget https://github.com/Kitware/CMake/releases/download/v${CMAKE_VERSION}/cmake-${CMAKE_VERSION}-SHA-256.txt \
    && gpg --keyserver hkps://keyserver.ubuntu.com --recv-keys C6C265324BBEBDC350B513D02D2CEF1034921684 \
    && gpg --verify cmake-${CMAKE_VERSION}-SHA-256.txt.asc cmake-${CMAKE_VERSION}-SHA-256.txt \
    && sha256sum -c --ignore-missing cmake-${CMAKE_VERSION}-SHA-256.txt \
    && sh ./cmake-${CMAKE_VERSION}-linux-x86_64.sh --skip-license --prefix=/usr/local --exclude-subdir \
    && rm -f /src/cmake-${CMAKE_VERSION}-linux-x86_64.sh
RUN cd /emsdk/upstream/emscripten \
    && echo libGL-mt libal libhtml5 libstubs-debug libnoexit libc-mt-debug libdlmalloc-mt libcompiler_rt-mt libc++-mt libc++abi-debug-mt libsockets-mt crtbegin | xargs -L1 -P$(nproc) ./embuilder.py build --lto \
    && echo 'int main() { return 0; }' > /tmp/a.c \
    && emcc -sUSE_ZLIB=1 -flto /tmp/a.c -lz -o /tmp/a.out \
    && rm -f /tmp/a.c /tmp/a.out \
    && chmod og=u -R /emsdk