Dockerfile

FROM emscripten/emsdk:3.1.35 as build_tool

RUN apt-get update && \
  apt-get --no-install-recommends -y install \
    build-essential \
    automake \
    autoconf \
    libtool \
    pkgconf \
    python3 \
    bison \
    flex \
    make \
    re2c \
    gdb \
    git \
    libxml2 \
    libxml2-dev \
    pv \
    re2c

FROM build_tool AS libxml
ARG LIBXML2_TAG=v2.9.10
RUN git clone https://gitlab.gnome.org/GNOME/libxml2.git libxml2 \
		--branch $LIBXML2_TAG \
		--single-branch     \
		--depth 1
WORKDIR /src/libxml2
RUN ./autogen.sh
RUN emconfigure ./configure --prefix=/src/libxml2/build --enable-static --disable-shared --with-python=no --with-threads=no
RUN emmake make -j8
RUN emmake make install

FROM build_tool AS sqlite
RUN wget https://sqlite.org/2020/sqlite-amalgamation-3330000.zip \
        && unzip sqlite-amalgamation-3330000.zip \
        && rm sqlite-amalgamation-3330000.zip \
        && mv sqlite-amalgamation-3330000 sqlite
WORKDIR /src/sqlite
RUN emcc -Oz -DSQLITE_OMIT_LOAD_EXTENSION -DSQLITE_DISABLE_LFS -DSQLITE_ENABLE_FTS3 -DSQLITE_ENABLE_FTS3_PARENTHESIS -DSQLITE_THREADSAFE=0 -DSQLITE_ENABLE_NORMALIZE -c sqlite3.c -o sqlite3.o

FROM build_tool as php_src
ARG PHP_BRANCH=PHP-8.3.0
RUN git clone https://github.com/php/php-src.git php-src \
		--branch $PHP_BRANCH \
		--single-branch \
		--depth 1

FROM php_src AS php-wasm
ARG WASM_ENVIRONMENT=web
ARG JAVASCRIPT_EXTENSION=mjs
ARG EXPORT_NAME=createPhpModule
ARG MODULARIZE=1
ARG EXPORT_ES6=1
ARG ASSERTIONS=0
ARG OPTIMIZE=-O1
# TODO: find a way to keep this, it can't be empty if defined...
# ARG PRE_JS=
ARG INITIAL_MEMORY=256mb
COPY --from=libxml /src/libxml2/build/ /src/usr
COPY --from=sqlite /src/sqlite/sqlite3.o /src/usr/lib/
COPY --from=sqlite /src/sqlite/sqlite3.h /src/usr/include/sqlite3/
ENV LIBXML_LIBS "-L/src/usr/lib"
ENV LIBXML_CFLAGS "-I/src/usr/include/libxml2"
ENV SQLITE_CFLAGS "-I/src/usr/include/sqlite3"
ENV SQLITE_LIBS "-L/src/usr/lib"
RUN cd /src/php-src && ./buildconf --force \
    && emconfigure ./configure \
		--enable-embed=static \
		--with-layout=GNU  \
		--with-libxml      \
		--enable-xml       \
		--disable-cgi      \
		--disable-cli      \
		--disable-fiber-asm \
		--disable-all      \
		--enable-session   \
		--enable-filter    \
		--enable-calendar  \
		--enable-dom       \
		--disable-rpath    \
		--disable-phpdbg   \
		--without-pear     \
		--with-valgrind=no \
		--without-pcre-jit \
		--enable-bcmath    \
		--enable-json      \
		--enable-ctype     \
		--enable-mbstring  \
		--disable-mbregex  \
		--with-config-file-scan-dir=/src/php  \
		--enable-tokenizer \
		--enable-simplexml   \
		--enable-pdo       \
		--with-pdo-sqlite  \
		--with-sqlite3
RUN cd /src/php-src && emmake make -j8
# PHP7 outputs a libphp7 whereas php8 a libphp
RUN cd /src/php-src && bash -c '[[ -f .libs/libphp7.la ]] && mv .libs/libphp7.la .libs/libphp.la && mv .libs/libphp7.a .libs/libphp.a && mv .libs/libphp7.lai .libs/libphp.lai || exit 0'
COPY ./source /src/source
RUN cd /src/php-src && emcc $OPTIMIZE \
		-I .     \
		-I Zend  \
		-I main  \
		-I TSRM/ \
		-c \
		/src/source/phpw.c \
		-o /src/phpw.o \
		-s ERROR_ON_UNDEFINED_SYMBOLS=0
RUN mkdir /build && cd /src/php-src && emcc $OPTIMIZE \
	-o /build/php-$WASM_ENVIRONMENT.$JAVASCRIPT_EXTENSION \
	--llvm-lto 2                     \
	-s EXPORTED_FUNCTIONS='["_phpw", "_phpw_flush", "_phpw_exec", "_phpw_run", "_chdir", "_setenv", "_php_embed_init", "_php_embed_shutdown", "_zend_eval_string"]' \
	-s EXTRA_EXPORTED_RUNTIME_METHODS='["ccall", "UTF8ToString", "lengthBytesUTF8", "FS"]' \
	-s ENVIRONMENT=$WASM_ENVIRONMENT    \
	-s FORCE_FILESYSTEM=1            \
	-s MAXIMUM_MEMORY=2gb             \
	-s INITIAL_MEMORY=$INITIAL_MEMORY \
	-s ALLOW_MEMORY_GROWTH=1         \
	-s ASSERTIONS=$ASSERTIONS      \
	-s ERROR_ON_UNDEFINED_SYMBOLS=0  \
	-s MODULARIZE=$MODULARIZE        \
	-s INVOKE_RUN=0                  \
	-s LZ4=1                  \
	-s EXPORT_ES6=$EXPORT_ES6 \
	-s EXPORT_NAME=$EXPORT_NAME \
	# -s DECLARE_ASM_MODULE_EXPORTS=0 \
	-lidbfs.js                       \
		/src/phpw.o /src/usr/lib/sqlite3.o .libs/libphp.a /src/usr/lib/libxml2.a
RUN rm -r /src/*

FROM scratch
COPY --from=php-wasm /build/ .