Vendor deps.

vendor/pyo3/wasm/emscripten/.gitignore

@@ -0,0 +1,2 @@
+pybuilddir.txt
+builddir

vendor/pyo3/wasm/emscripten/Makefile

@@ -0,0 +1,58 @@
+include ../common.mk
+
+NODE_VERSION=24.18.0
+
+PLATFORM=wasm32_emscripten
+SYSCONFIGDATA_NAME=_sysconfigdata__$(PLATFORM)
+
+export EMSDKDIR = $(PYTHONBUILD)/emsdk-cache
+
+PYTHONLIBDIR=$(BUILDROOT)/install/Python-$(PYVERSION)/lib
+CROSS_PYTHON=$(PYTHONBUILD)/cross-build/wasm32-emscripten/build/python/python.sh
+
+# Download Node.js when building locally; in CI it is provided by actions/setup-node.
+ifdef GITHUB_ACTIONS
+NODE_DEP=
+NODE_BIN=$(shell which node)
+else
+NODE_DIR=$(BUILDROOT)/node
+NODE_DEP=$(NODE_DIR)/.exists
+NODE_BIN=$(NODE_DIR)/bin/node
+NODE_OS := $(shell uname -s | tr '[:upper:]' '[:lower:]')
+NODE_ARCH := $(shell uname -m | sed -e 's/x86_64/x64/' -e 's/aarch64/arm64/')
+NODE_URL=https://nodejs.org/dist/v$(NODE_VERSION)/node-v$(NODE_VERSION)-$(NODE_OS)-$(NODE_ARCH).tar.xz
+endif
+
+# Prepend the downloaded Node.js to PATH (no-op in CI, where setup-node provides it).
+export PATH := $(NODE_BIN)$(PATH)
+
+all: $(PYTHONLIBDIR)/libpython$(PYMAJORMINOR).a
+
+$(NODE_DIR)/.exists: $(BUILDROOT)/.exists
+	[ -d $(NODE_DIR) ] || mkdir -p $(NODE_DIR)
+	curl -s -S --location $(NODE_URL) | \
+		tar --strip-components 1 --directory $(NODE_DIR) --extract --xz
+	touch $@
+
+$(CROSS_PYTHON): $(PYTHONBUILD)/.exists $(NODE_DEP)
+	cd $(PYTHONBUILD) && \
+	$(PYTHON) Platforms/emscripten install-emscripten --emsdk-cache=$(EMSDKDIR) && \
+	$(PYTHON) Platforms/emscripten build --emsdk-cache=$(EMSDKDIR) --host-runner=$(NODE_BIN)
+
+$(PYTHONLIBDIR)/libpython$(PYMAJORMINOR).a: $(CROSS_PYTHON)
+	# Generate sysconfigdata
+	_PYTHON_SYSCONFIGDATA_NAME=$(SYSCONFIGDATA_NAME) _PYTHON_PROJECT_BASE=$(PYTHONBUILD)/cross-build/wasm32-emscripten/build/python $(CROSS_PYTHON) -m sysconfig --generate-posix-vars
+	cp `cat pybuilddir.txt`/$(SYSCONFIGDATA_NAME).py $(PYTHONBUILD)/Lib
+
+	mkdir -p $(PYTHONLIBDIR)
+	# Make a static library for _hacl, for some reason these are missing from the build?
+	# source emsdk_env.sh to get emar in PATH, works best when done from the emsdk directory
+	EMSDK_ENV=$$(find $(PYTHONBUILD)/emsdk-cache -name 'emsdk_env.sh' | head -n 1) && \
+	    cd $$(dirname $$EMSDK_ENV) && \
+		. $$EMSDK_ENV && \
+	    cd $(PYTHONBUILD)/cross-build/wasm32-emscripten/build/python && \
+		emar rcs Modules/_hacl/libhacl.a Modules/_hacl/*.o
+	# Copy all .a libraries
+	find $(PYTHONBUILD)/cross-build/wasm32-emscripten/ -name '*.a' -exec cp {} $(PYTHONLIBDIR) \;
+	# Install Python stdlib
+	cp -r $(PYTHONBUILD)/Lib $(PYTHONLIBDIR)/python$(PYMAJORMINOR)

vendor/pyo3/wasm/emscripten/runner.py

@@ -0,0 +1,11 @@
+#!/usr/local/bin/python
+import pathlib
+import sys
+import subprocess
+
+p = pathlib.Path(sys.argv[1])
+
+command = ["node", p.name, *sys.argv[2:]]
+print("Running:", " ".join(command))
+
+sys.exit(subprocess.call(command, cwd=p.parent))