docker/dockerfiles/emsdk-wasm32-cross.docker

# syntax = docker/dockerfile:1.5

ARG EMSDK_VERSION_QEMU=3.1.50
ARG ZLIB_VERSION=1.3.1
ARG GLIB_MINOR_VERSION=2.84
ARG GLIB_VERSION=${GLIB_MINOR_VERSION}.0
ARG PIXMAN_VERSION=0.44.2
ARG FFI_VERSION=v3.4.7
ARG MESON_VERSION=1.5.0

FROM emscripten/emsdk:$EMSDK_VERSION_QEMU AS build-base
ARG MESON_VERSION
ENV TARGET=/builddeps/target
ENV CPATH="$TARGET/include"
ENV PKG_CONFIG_PATH="$TARGET/lib/pkgconfig"
ENV EM_PKG_CONFIG_PATH="$PKG_CONFIG_PATH"
ENV CFLAGS="-O3 -pthread -DWASM_BIGINT"
ENV CXXFLAGS="$CFLAGS"
ENV LDFLAGS="-sWASM_BIGINT -sASYNCIFY=1 -L$TARGET/lib"
RUN apt-get update && apt-get install -y \
    autoconf \
    build-essential \
    libglib2.0-dev \
    libtool \
    pkgconf \
    ninja-build \
    python3-pip
RUN pip3 install meson==${MESON_VERSION} tomli
RUN mkdir /build
WORKDIR /build
RUN mkdir -p $TARGET
RUN <<EOF
cat <<EOT > /cross.meson
[host_machine]
system = 'emscripten'
cpu_family = 'wasm32'
cpu = 'wasm32'
endian = 'little'

[binaries]
c = 'emcc'
cpp = 'em++'
ar = 'emar'
ranlib = 'emranlib'
pkgconfig = ['pkg-config', '--static']
EOT
EOF

FROM build-base AS zlib-dev
ARG ZLIB_VERSION
RUN mkdir -p /zlib
RUN curl -Ls https://zlib.net/zlib-$ZLIB_VERSION.tar.xz | \
    tar xJC /zlib --strip-components=1
WORKDIR /zlib
RUN emconfigure ./configure --prefix=$TARGET --static
RUN emmake make install -j$(nproc)

FROM build-base AS libffi-dev
ARG FFI_VERSION
RUN mkdir -p /libffi
RUN git clone https://github.com/libffi/libffi /libffi
WORKDIR /libffi
RUN git checkout $FFI_VERSION
RUN autoreconf -fiv
RUN emconfigure ./configure --host=wasm32-unknown-linux \
    --prefix=$TARGET --enable-static \
    --disable-shared --disable-dependency-tracking \
    --disable-builddir --disable-multi-os-directory \
    --disable-raw-api --disable-docs
RUN emmake make install SUBDIRS='include' -j$(nproc)

FROM build-base AS pixman-dev
ARG PIXMAN_VERSION
RUN mkdir /pixman/
RUN git clone  https://gitlab.freedesktop.org/pixman/pixman /pixman/
WORKDIR /pixman
RUN git checkout pixman-$PIXMAN_VERSION
RUN <<EOF
cat <<EOT >> /cross.meson
[built-in options]
c_args = [$(printf "'%s', " $CFLAGS | sed 's/, $//')]
cpp_args = [$(printf "'%s', " $CFLAGS | sed 's/, $//')]
objc_args = [$(printf "'%s', " $CFLAGS | sed 's/, $//')]
c_link_args = [$(printf "'%s', " $LDFLAGS | sed 's/, $//')]
cpp_link_args = [$(printf "'%s', " $LDFLAGS | sed 's/, $//')]
EOT
EOF
RUN meson setup _build --prefix=$TARGET --cross-file=/cross.meson \
    --default-library=static \
    --buildtype=release -Dtests=disabled -Ddemos=disabled
RUN meson install -C _build

FROM build-base AS glib-dev
ARG GLIB_VERSION
ARG GLIB_MINOR_VERSION
RUN mkdir -p /stub
WORKDIR /stub
RUN <<EOF
cat <<'EOT' > res_query.c
#include <netdb.h>
int res_query(const char *name, int class,
              int type, unsigned char *dest, int len)
{
    h_errno = HOST_NOT_FOUND;
    return -1;
}
EOT
EOF
RUN emcc ${CFLAGS} -c res_query.c -fPIC -o libresolv.o
RUN ar rcs libresolv.a libresolv.o
RUN mkdir -p $TARGET/lib/
RUN cp libresolv.a $TARGET/lib/

RUN mkdir -p /glib
RUN curl -Lks https://download.gnome.org/sources/glib/${GLIB_MINOR_VERSION}/glib-$GLIB_VERSION.tar.xz | \
    tar xJC /glib --strip-components=1

COPY --link --from=zlib-dev /builddeps/ /builddeps/
COPY --link --from=libffi-dev /builddeps/ /builddeps/

WORKDIR /glib
RUN <<EOF
CFLAGS="$CFLAGS -Wno-incompatible-function-pointer-types" ;
cat <<EOT >> /cross.meson
[built-in options]
c_args = [$(printf "'%s', " $CFLAGS | sed 's/, $//')]
cpp_args = [$(printf "'%s', " $CFLAGS | sed 's/, $//')]
objc_args = [$(printf "'%s', " $CFLAGS | sed 's/, $//')]
c_link_args = [$(printf "'%s', " $LDFLAGS | sed 's/, $//')]
cpp_link_args = [$(printf "'%s', " $LDFLAGS | sed 's/, $//')]
EOT
EOF
RUN meson setup _build --prefix=$TARGET --cross-file=/cross.meson \
    --default-library=static --buildtype=release --force-fallback-for=pcre2 \
    -Dselinux=disabled -Dxattr=false -Dlibmount=disabled -Dnls=disabled \
    -Dtests=false -Dglib_debug=disabled -Dglib_assert=false -Dglib_checks=false
# FIXME: emscripten doesn't provide some pthread functions in the final link,
#        which isn't detected during meson setup.
RUN sed -i -E "/#define HAVE_POSIX_SPAWN 1/d" ./_build/config.h
RUN sed -i -E "/#define HAVE_PTHREAD_GETNAME_NP 1/d" ./_build/config.h
RUN meson install -C _build

FROM build-base
COPY --link --from=glib-dev /builddeps/ /builddeps/
COPY --link --from=pixman-dev /builddeps/ /builddeps/