Fastparquet. adds fastparquet and the cramjam backend.

In progress (both build on my machine, untested so far)
export PYVERSION ?= 3.11.2
export PYODIDE_EMSCRIPTEN_VERSION ?= 3.1.31

export PLATFORM_TRIPLET=wasm32-emscripten
export SYSCONFIG_NAME=_sysconfigdata__emscripten_$(PLATFORM_TRIPLET)

# BASH_ENV tells bash to run pyodide_env.sh on startup, which sets various
# environment variables. The next line instructs make to use bash to run each
# command.
export BASH_ENV := $(PYODIDE_ROOT)/pyodide_env.sh
SHELL := /bin/bash

version_tuple := $(subst ., ,$(PYVERSION:v%=%))
export PYMAJOR=$(word 1,$(version_tuple))
export PYMINOR=$(word 2,$(version_tuple))
export PYMICRO=$(word 3,$(version_tuple))

export HOSTPYTHONROOT=$(shell python${PYMAJOR}.${PYMINOR} -c "import sys; print(sys.prefix)")
export HOSTPYTHON=$(HOSTPYTHONROOT)/bin/python$(PYMAJOR).$(PYMINOR)

export CPYTHONROOT=$(PYODIDE_ROOT)/cpython
export CPYTHONINSTALL=$(CPYTHONROOT)/installs/python-$(PYVERSION)
export CPYTHONLIB=$(CPYTHONINSTALL)/lib/python$(PYMAJOR).$(PYMINOR)
export SYSCONFIGDATA_DIR=$(CPYTHONINSTALL)/sysconfigdata/
export CPYTHONBUILD=$(CPYTHONROOT)/build/Python-$(PYVERSION)/

export TARGETINSTALLDIR=$(PYODIDE_ROOT)/cpython/installs/python-$(PYVERSION)
export HOSTINSTALLDIR=$(PYODIDE_ROOT)/packages/.artifacts
export HOSTSITEPACKAGES=$(PYODIDE_ROOT)/packages/.artifacts/lib/python$(PYMAJOR).$(PYMINOR)/site-packages
export WASM_LIBRARY_DIR=$(PYODIDE_ROOT)/packages/.libs
export WASM_PKG_CONFIG_PATH=$(PYODIDE_ROOT)/packages/.libs/lib/pkgconfig

export PYTHONINCLUDE=$(PYODIDE_ROOT)/cpython/installs/python-$(PYVERSION)/include/python$(PYMAJOR).$(PYMINOR)

# Use env variable if defined, otherwise fallback to './'
export PYODIDE_BASE_URL?=./

# For packages that depend on numpy.
# TODO: maybe move this somewhere else?
export NUMPY_LIB=$(HOSTSITEPACKAGES)/numpy/


# This environment variable is used for packages to detect if they are built
# for pyodide during build time
export PYODIDE=1
# This is the legacy environment variable used for the aforementioned purpose
export PYODIDE_PACKAGE_ABI=1

export DBGFLAGS_NODEBUG=-g0
export DBGFLAGS_WASMDEBUG=-g2
export DBGFLAGS_SOURCEMAPDEBUG=-g3
export DBG_LDFLAGS_SOURCEMAPDEBUG=-gseparate-dwarf

export DBGFLAGS=$(DBGFLAGS_NODEBUG)

ifdef PYODIDE_DEBUG
	export PYODIDE_SYMBOLS=1
	export PYODIDE_DEBUG_JS=1
	export PYODIDE_ASSERTIONS=1
endif

ifdef PYODIDE_SOURCEMAP
	# Debug with source maps (less useful than WASMDEBUG but easier if it helps)
	export DBGFLAGS=$(DBGFLAGS_SOURCEMAPDEBUG)
	export DBG_LDFLAGS=$(DBG_LDFLAGS_SOURCEMAPDEBUG)
else
	ifdef PYODIDE_SYMBOLS
		# Include debug symbols but no source maps (most useful)
		export DBGFLAGS=$(DBGFLAGS_WASMDEBUG)
	endif
endif

ifdef PYODIDE_ASSERTIONS
	EXTRA_CFLAGS+=" -DDEBUG_F"
endif


export OPTFLAGS=-O2
export CFLAGS_BASE=\
	$(OPTFLAGS) \
	$(DBGFLAGS) \
	-fPIC \
	$(EXTRA_CFLAGS)


export LDFLAGS_BASE=\
	$(OPTFLAGS) \
	$(DBGFLAGS) \
	$(DBG_LDFLAGS) \
	-s MODULARIZE=1 \
	-std=c++14 \
	-s LZ4=1 \
	-L $(CPYTHONROOT)/installs/python-$(PYVERSION)/lib/ \
	-s WASM_BIGINT \
	$(EXTRA_LDFLAGS)

export CXXFLAGS_BASE=\
	-std=c++14

export SIDE_MODULE_LDFLAGS=	$(LDFLAGS_BASE) -s SIDE_MODULE=1
export MAIN_MODULE_LDFLAGS= $(LDFLAGS_BASE) \
	-s MAIN_MODULE=1 \
	-s EXPORT_NAME="'_createPyodideModule'" \
	-s EXPORT_EXCEPTION_HANDLING_HELPERS \
	-s EXCEPTION_CATCHING_ALLOWED=['we only want to allow exception handling in side modules'] \
	-sEXPORTED_RUNTIME_METHODS='stackAlloc,stackRestore,stackSave' \
	-s DEMANGLE_SUPPORT=1 \
	-s USE_ZLIB \
	-s USE_BZIP2 \
	-s FORCE_FILESYSTEM=1 \
	-s TOTAL_MEMORY=20971520 \
	-s ALLOW_MEMORY_GROWTH=1 \
	-s EXPORT_ALL=1 \
	-s POLYFILL \
	-s MIN_SAFARI_VERSION=140000 \
	-s STACK_SIZE=5MB \
	-s AUTO_JS_LIBRARIES=0 \
	-s AUTO_NATIVE_LIBRARIES=0 \
	-s NODEJS_CATCH_EXIT=0 \
	-s NODEJS_CATCH_REJECTION=0 \
	\
	-lpython$(PYMAJOR).$(PYMINOR) \
	-lffi \
	-lstdc++ \
	-lidbfs.js \
	-lnodefs.js \
	-lproxyfs.js \
	-lworkerfs.js \
	-lwebsocket.js \
	-leventloop.js


export SIDE_MODULE_CXXFLAGS = $(CXXFLAGS_BASE)

export SIDE_MODULE_CFLAGS= $(CFLAGS_BASE) -I$(PYTHONINCLUDE)
export MAIN_MODULE_CFLAGS= $(CFLAGS_BASE) \
	-Wall \
	-Wno-warn-absolute-paths \
	-Werror=unused-variable \
	-Werror=sometimes-uninitialized \
	-Werror=int-conversion \
	-Werror=incompatible-pointer-types \
	-Werror=unused-result \
	-I$(PYTHONINCLUDE) \
	-s EXCEPTION_CATCHING_ALLOWED=['we only want to allow exception handling in side modules']

export STDLIB_MODULE_CFLAGS= $(SIDE_MODULE_CFLAGS) -I Include/ -I . -I Include/internal/

# For RUST
export CARGO_BUILD_TARGET=wasm32-unknown-emscripten
export CARGO_TARGET_WASM32_UNKNOWN_EMSCRIPTEN_LINKER=emcc
export RUST_TOOLCHAIN=nightly-2022-06-26


# idealy we could automatically include all SIDE_MODULE_LDFLAGS here
export RUSTFLAGS= \
	-C link-arg=-sSIDE_MODULE=2 \
	-C link-arg=-sWASM_BIGINT \
	-Z link-native-libraries=no

.output_vars:
	set

export PYVERSION ?= 3.11.2
export PYODIDE_EMSCRIPTEN_VERSION ?= 3.1.31

export PLATFORM_TRIPLET=wasm32-emscripten
export SYSCONFIG_NAME=_sysconfigdata__emscripten_$(PLATFORM_TRIPLET)

# BASH_ENV tells bash to run pyodide_env.sh on startup, which sets various
# environment variables. The next line instructs make to use bash to run each
# command.
export BASH_ENV := $(PYODIDE_ROOT)/pyodide_env.sh
SHELL := /bin/bash

version_tuple := $(subst ., ,$(PYVERSION:v%=%))
export PYMAJOR=$(word 1,$(version_tuple))
export PYMINOR=$(word 2,$(version_tuple))
export PYMICRO=$(word 3,$(version_tuple))

export HOSTPYTHONROOT=$(shell python${PYMAJOR}.${PYMINOR} -c "import sys; print(sys.prefix)")
export HOSTPYTHON=$(HOSTPYTHONROOT)/bin/python$(PYMAJOR).$(PYMINOR)

export CPYTHONROOT=$(PYODIDE_ROOT)/cpython
export CPYTHONINSTALL=$(CPYTHONROOT)/installs/python-$(PYVERSION)
export CPYTHONLIB=$(CPYTHONINSTALL)/lib/python$(PYMAJOR).$(PYMINOR)
export SYSCONFIGDATA_DIR=$(CPYTHONINSTALL)/sysconfigdata/
export CPYTHONBUILD=$(CPYTHONROOT)/build/Python-$(PYVERSION)/

export TARGETINSTALLDIR=$(PYODIDE_ROOT)/cpython/installs/python-$(PYVERSION)
export HOSTINSTALLDIR=$(PYODIDE_ROOT)/packages/.artifacts
export HOSTSITEPACKAGES=$(PYODIDE_ROOT)/packages/.artifacts/lib/python$(PYMAJOR).$(PYMINOR)/site-packages
export WASM_LIBRARY_DIR=$(PYODIDE_ROOT)/packages/.libs
export WASM_PKG_CONFIG_PATH=$(PYODIDE_ROOT)/packages/.libs/lib/pkgconfig

export PYTHONINCLUDE=$(PYODIDE_ROOT)/cpython/installs/python-$(PYVERSION)/include/python$(PYMAJOR).$(PYMINOR)

# Use env variable if defined, otherwise fallback to './'
export PYODIDE_BASE_URL?=./

# For packages that depend on numpy.
# TODO: maybe move this somewhere else?
export NUMPY_LIB=$(HOSTSITEPACKAGES)/numpy/


# This environment variable is used for packages to detect if they are built
# for pyodide during build time
export PYODIDE=1
# This is the legacy environment variable used for the aforementioned purpose
export PYODIDE_PACKAGE_ABI=1

export DBGFLAGS_NODEBUG=-g0
export DBGFLAGS_WASMDEBUG=-g2
export DBGFLAGS_SOURCEMAPDEBUG=-g3
export DBG_LDFLAGS_SOURCEMAPDEBUG=-gseparate-dwarf

export DBGFLAGS=$(DBGFLAGS_NODEBUG)

ifdef PYODIDE_DEBUG
	export PYODIDE_SYMBOLS=1
	export PYODIDE_DEBUG_JS=1
	export PYODIDE_ASSERTIONS=1
endif

ifdef PYODIDE_SOURCEMAP
	# Debug with source maps (less useful than WASMDEBUG but easier if it helps)
	export DBGFLAGS=$(DBGFLAGS_SOURCEMAPDEBUG)
	export DBG_LDFLAGS=$(DBG_LDFLAGS_SOURCEMAPDEBUG)
else
	ifdef PYODIDE_SYMBOLS
		# Include debug symbols but no source maps (most useful)
		export DBGFLAGS=$(DBGFLAGS_WASMDEBUG)
	endif
endif

ifdef PYODIDE_ASSERTIONS
	EXTRA_CFLAGS+=" -DDEBUG_F"
endif


export OPTFLAGS=-O2
export CFLAGS_BASE=\
	$(OPTFLAGS) \
	$(DBGFLAGS) \
	-fPIC \
	$(EXTRA_CFLAGS)


export LDFLAGS_BASE=\
	$(OPTFLAGS) \
	$(DBGFLAGS) \
	$(DBG_LDFLAGS) \
	-s MODULARIZE=1 \
	-std=c++14 \
	-s LZ4=1 \
	-L $(CPYTHONROOT)/installs/python-$(PYVERSION)/lib/ \
	-s WASM_BIGINT \
	$(EXTRA_LDFLAGS)

export CXXFLAGS_BASE=\
	-std=c++14

export SIDE_MODULE_LDFLAGS=	$(LDFLAGS_BASE) -s SIDE_MODULE=1
export MAIN_MODULE_LDFLAGS= $(LDFLAGS_BASE) \
	-s MAIN_MODULE=1 \
	-s EXPORT_NAME="'_createPyodideModule'" \
	-s EXPORT_EXCEPTION_HANDLING_HELPERS \
	-s EXCEPTION_CATCHING_ALLOWED=['we only want to allow exception handling in side modules'] \
	-sEXPORTED_RUNTIME_METHODS='stackAlloc,stackRestore,stackSave' \
	-s DEMANGLE_SUPPORT=1 \
	-s USE_ZLIB \
	-s USE_BZIP2 \
	-s FORCE_FILESYSTEM=1 \
	-s TOTAL_MEMORY=20971520 \
	-s ALLOW_MEMORY_GROWTH=1 \
	-s EXPORT_ALL=1 \
	-s POLYFILL \
	-s MIN_SAFARI_VERSION=140000 \
	-s STACK_SIZE=5MB \
	-s AUTO_JS_LIBRARIES=0 \
	-s AUTO_NATIVE_LIBRARIES=0 \
	-s NODEJS_CATCH_EXIT=0 \
	-s NODEJS_CATCH_REJECTION=0 \
	\
	-lpython$(PYMAJOR).$(PYMINOR) \
	-lffi \
	-lstdc++ \
	-lidbfs.js \
	-lnodefs.js \
	-lproxyfs.js \
	-lworkerfs.js \
	-lwebsocket.js \
	-leventloop.js


export SIDE_MODULE_CXXFLAGS = $(CXXFLAGS_BASE)

export SIDE_MODULE_CFLAGS= $(CFLAGS_BASE) -I$(PYTHONINCLUDE)
export MAIN_MODULE_CFLAGS= $(CFLAGS_BASE) \
	-Wall \
	-Wno-warn-absolute-paths \
	-Werror=unused-variable \
	-Werror=sometimes-uninitialized \
	-Werror=int-conversion \
	-Werror=incompatible-pointer-types \
	-Werror=unused-result \
	-I$(PYTHONINCLUDE) \
	-s EXCEPTION_CATCHING_ALLOWED=['we only want to allow exception handling in side modules']

export STDLIB_MODULE_CFLAGS= $(SIDE_MODULE_CFLAGS) -I Include/ -I . -I Include/internal/

# For RUST
export CARGO_BUILD_TARGET=wasm32-unknown-emscripten
export CARGO_TARGET_WASM32_UNKNOWN_EMSCRIPTEN_LINKER=emcc
export RUST_TOOLCHAIN=nightly-2022-06-26
export PYO3_CROSS_LIB_DIR=${CPYTHONINSTALL}/lib
export PYO3_CROSS_INCLUDE_DIR=${PYTHONINCLUDE}

# idealy we could automatically include all SIDE_MODULE_LDFLAGS here
export RUSTFLAGS= \
	-C link-arg=-sSIDE_MODULE=2 \
	-C link-arg=-sWASM_BIGINT \
	-Z link-native-libraries=no
.output_vars:
	set
