Build script for https://github.com/emscripten-core/emscripten/issues/11066.

README.md

git clone https://gist.github.com/9faec54d0d7d686da383c6678fe64cf3.git glib-emscripten
cd glib-emscripten
docker build -t glib-emscripten .
docker run --rm -v $(pwd):/src glib-emscripten ./build.sh

build.sh

#!/usr/bin/env bash
set -e

SOURCE_DIR=$PWD

# Working directories
DEPS=$SOURCE_DIR/deps
TARGET=$SOURCE_DIR/target
rm -rf $DEPS/
mkdir $DEPS
mkdir -p $TARGET

# Define default arguments

# JS BigInt to Wasm i64 integration, enabled by default
WASM_BIGINT=true

# Parse arguments
while [ $# -gt 0 ]; do
  case $1 in
    --disable-wasm-bigint) WASM_BIGINT=false ;;
    *) echo "ERROR: Unknown parameter: $1" >&2; exit 1 ;;
  esac
  shift
done

# Common compiler flags
export CFLAGS="-O3"
if [ "$WASM_BIGINT" = "true" ]; then
  # libffi needs to detect WASM_BIGINT support at compile time
  export CFLAGS+=" -DWASM_BIGINT"
fi
export CXXFLAGS="$CFLAGS"
export LDFLAGS="-L$TARGET/lib -O3"
if [ "$WASM_BIGINT" = "true" ]; then export LDFLAGS+=" -sWASM_BIGINT"; fi

# Build paths
export CPATH="$TARGET/include"
export PKG_CONFIG_PATH="$TARGET/lib/pkgconfig"
export EM_PKG_CONFIG_PATH="$PKG_CONFIG_PATH"

# Specific variables for cross-compilation
export CHOST="wasm32-unknown-linux" # wasm32-unknown-emscripten
export MESON_CROSS="$SOURCE_DIR/emscripten-crossfile.meson"

# Run as many parallel jobs as there are available CPU cores
export MAKEFLAGS="-j$(nproc)"

# Dependency version numbers
VERSION_ZLIB=1.2.13
VERSION_FFI=3.4.4
VERSION_GLIB=2.75.0

# Remove patch version component
without_patch() {
  echo "${1%.[[:digit:]]*}"
}

mkdir $DEPS/zlib
curl -Ls http://zlib.net/zlib-$VERSION_ZLIB.tar.xz | tar xJC $DEPS/zlib --strip-components=1
cd $DEPS/zlib
emconfigure ./configure --prefix=$TARGET --static
make install

mkdir $DEPS/ffi
curl -Ls https://github.com/libffi/libffi/releases/download/v$VERSION_FFI/libffi-$VERSION_FFI.tar.gz | tar xzC $DEPS/ffi --strip-components=1
cd $DEPS/ffi
# TODO(kleisauke): https://github.com/hoodmane/libffi-emscripten/issues/16
curl -Ls https://github.com/libffi/libffi/compare/v$VERSION_FFI...kleisauke:wasm-vips.patch | patch -p1
autoreconf -fiv
# Compile without -fexceptions
sed -i 's/ -fexceptions//g' configure
emconfigure ./configure --host=$CHOST --prefix=$TARGET --enable-static --disable-shared --disable-dependency-tracking \
  --disable-builddir --disable-multi-os-directory --disable-raw-api --disable-structs --disable-docs
make install SUBDIRS='include'

mkdir $DEPS/glib
curl -Lks https://download.gnome.org/sources/glib/$(without_patch $VERSION_GLIB)/glib-$VERSION_GLIB.tar.xz | tar xJC $DEPS/glib --strip-components=1
cd $DEPS/glib
# TODO(kleisauke): Discuss these patches upstream
curl -Ls https://github.com/GNOME/glib/compare/$VERSION_GLIB...kleisauke:wasm-vips-$VERSION_GLIB.patch | patch -p1
meson setup _build --prefix=$TARGET --cross-file=$MESON_CROSS --default-library=static --buildtype=release \
  --force-fallback-for=pcre2,gvdb -Dselinux=disabled -Dxattr=false -Dlibmount=disabled -Dnls=disabled \
  -Dtests=false -Dglib_assert=false -Dglib_checks=false
meson install -C _build

Dockerfile

# https://github.com/emscripten-core/emsdk
FROM emscripten/emsdk:3.1.25

RUN apt-get update \
  && apt-get install -qqy \
    autoconf \
    build-essential \
    libglib2.0-dev \
    libtool \
    pkgconf \
    # needed for Meson
    ninja-build \
    python3-pip \
  # https://github.com/mesonbuild/meson/pull/10969
  && pip3 install git+https://github.com/kleisauke/meson@wasm-vips

emscripten-crossfile.meson

[binaries]
c = 'emcc'
cpp = 'em++'
ld = 'wasm-ld'
ar = 'emar'
ranlib = 'emranlib'
pkgconfig = ['emconfigure', 'pkg-config']

# https://docs.gtk.org/glib/cross-compiling.html#cross-properties
[properties]
growing_stack = true
have_c99_vsnprintf = true
have_c99_snprintf = true
have_unix98_printf = true

# Ensure that `-s PTHREAD_POOL_SIZE=*` is not injected into .pc files
[built-in options]
c_thread_count = 0
cpp_thread_count = 0

[host_machine]
system = 'emscripten'
cpu_family = 'wasm32'
cpu = 'wasm32'
endian = 'little'