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#!/bin/bash -ex

# Compile minimal Python for Emscripten and native local testing

# Copying and distribution of this file, with or without modification,

# are permitted in any medium without royalty provided the copyright

# notice and this notice are preserved. This file is offered as-is,

# without any warranty.

VERSION=3.8.3

SCRIPTDIR=$(dirname $(readlink -f $0))

DESTDIR=${DESTDIR:-$SCRIPTDIR/destdir}

SETUPLOCAL=${SETUPLOCAL:-'/dev/null'}

CACHEROOT=$SCRIPTDIR

BUILD=$SCRIPTDIR/build

export QUILT_PATCHES=$(dirname $(readlink -f $0))/patches

WGET=${WGET:-wget}

unpack () {

$WGET -c https://www.python.org/ftp/python/$VERSION/Python-$VERSION.tar.xz -P $CACHEROOT/

mkdir -p $BUILD

cd $BUILD/

rm -rf Python-$VERSION/

tar xf $CACHEROOT/Python-$VERSION.tar.xz

cd Python-$VERSION/

quilt push -a

}

# use cases:

# - python/.pyo for emscripten() below

# - common basis for crosspython below

hostpython () {

cd $BUILD/Python-$VERSION/

mkdir -p native

(

cd native/

if [ ! -e config.status ]; then

../configure \

--prefix=''

make -j$(nproc)

rm -rf $BUILD/hostpython

make install DESTDIR=$BUILD/hostpython

)

}

emscripten () {

cd $BUILD/Python-$VERSION/

mkdir -p emscripten

(

cd emscripten/

# OPT=-Oz: TODO

# CONFIG_SITE: deals with cross-compilation https://bugs.python.org/msg136962

# PATH: detect our Python, beware of conflict with emcc's python3

# don't use PYTHON_FOR_BUILD which is high-level / lots of options

# --without-pymalloc: ?

# --disable-ipv6: ?

# --disable-shared: compile statically for Emscripten perfs + incomplete PIC support

if [ ! -e config.status ]; then

CONFIG_SITE=../config-emscripten.site READELF=true \

BASECFLAGS='-s USE_ZLIB=1' LDFLAGS='-s USE_ZLIB=1' \

PATH=$BUILD/Python-$VERSION/native:$PATH \

emconfigure ../configure \

--host=asmjs-unknown-emscripten --build=$(../config.guess) \

--prefix='' \

--without-pymalloc --disable-ipv6 \

--disable-shared

cat <<EOF >> pyconfig.h

/* issues with posixmodule.c */

#undef HAVE_POSIX_SPAWN

#undef HAVE_POSIX_SPAWNP

/* issues with signalmodule.c */

#undef HAVE_PTHREAD_SIGMASK

EOF

# Modules/Setup.local

echo '*static*' > Modules/Setup.local

cat $SETUPLOCAL >> Modules/Setup.local

# drop -I/-L/-lz, we USE_ZLIB=1 (keep it in SETUPLOCAL for mock)

sed -i -e 's/^$zlib zlibmodule.c$.*/\1/' Modules/Setup.local

emmake make Makefile

# decrease .pyo size by dropping docstrings

sed -i -e '/compileall.py/ s/ -O / -OO /' Makefile

(

export PATH=$BUILD/Python-$VERSION/native:$PATH

# Trigger setup.py:CROSS_COMPILING (introduced in 3.8)

export _PYTHON_HOST_PLATFORM=emscripten

emmake make -j$(nproc)

emmake make install DESTDIR=$DESTDIR

)

# Basic trimming

# Disabled for now, better cherry-pick the files we need

#emmake make install DESTDIR=$(pwd)/destdir

#find destdir/ -name "*.py" -print0 | xargs -r0 rm

#find destdir/ -name "*.pyo" -print0 | xargs -r0 rm # only keep .pyc, .pyo apparently don't work

#find destdir/ -name "*.so" -print0 | xargs -r0 rm

#rm -rf destdir/usr/local/bin/

#rm -rf destdir/usr/local/share/man/

#rm -rf destdir/usr/local/include/

#rm -rf destdir/usr/local/lib/*.a

#rm -rf destdir/usr/local/lib/pkgconfig/

#rm -rf destdir/usr/local/lib/python2.7/test/

# Ditch .so for now, they cause an abort() with dynamic

# linking unless we recompile all of them as SIDE_MODULE-s

#rm -rf $DESTDIR/lib/python2.7/lib-dynload/

)

}

# For mock-ing emscripten environment through static desktop python

mock () {

cd $BUILD/Python-$VERSION/

mkdir -p native

(

cd native/

if [ ! -e config.status ]; then

../configure \

--prefix=$BUILD/hostpython/ \

--without-threads --without-pymalloc --without-signal-module --disable-ipv6 \

--disable-shared

echo '*static*' > Modules/Setup.local

cat $SETUPLOCAL >> Modules/Setup.local

make -j$(nproc) Parser/pgen python

make -j$(nproc)

DESTDIR= make install

)

}

# python aimed at compiling third-party Python modules to WASM

# - building static/dynamic wasm modules

# - compiling .pyo files, in emscripten() and package-xxx.sh

# Uses hostpython; detects its PYTHONHOME through ../lib AFAICS, no need to recompile

# Usage:

# .../crosspython-static/bin/python setup.py xxx --root=.../destdir/ --prefix=''

# .../crosspython-dynamic/bin/python setup.py xxx --root=.../destdir/ --prefix=''

# .../crosspython-static/bin/python -OO -m py_compile xxx.py

# Note: maybe create and patch two virtualenv instead? but harder to

# use with dual static/dynamic Makefile; doesn't handle root=destdir

crosspython () {

cd $SCRIPTDIR

# Copy-link hostpython except for include/ and

# lib/python3.8/_sysconfigdata.py

for variant in static dynamic; do

rm -rf crosspython-$variant

mkdir crosspython-$variant

(

cd crosspython-$variant

for i in $(cd ../build/hostpython && ls -A); do

ln -s ../build/hostpython/$i $i

done

rm include lib

mkdir lib

for i in $(cd ../build/hostpython/lib && ls -A); do

ln -s ../../build/hostpython/lib/$i lib/$i

done

rm lib/python3.8

mkdir lib/python3.8

for i in $(cd ../build/hostpython/lib/python3.8 && ls -A); do

ln -s ../../../build/hostpython/lib/python3.8/$i lib/python3.8/$i

done

# Use Python.h configured for WASM

ln -s $DESTDIR/include include

# Use compiler settings configured for WASM

cp -a $DESTDIR/lib/python3.8/_sysconfigdata__emscripten_.py \

lib/python3.8/_sysconfigdata_*.py

)

done

# 'CCSHARED': 'xxx',

sed -i -e "s/'CCSHARED': .*/'CCSHARED': '-fPIC -s SIDE_MODULE=1',/" \

crosspython-dynamic/lib/python3.8/_sysconfigdata_*.py

}

case "$1" in

unpack|hostpython|emscripten|mock|crosspython)

"$1"

;;

'')

unpack

hostpython

emscripten

crosspython

;;

echo "Usage: $0 unpack|hostpython|emscripten|mock|crosspython"

exit 1

;;

esac