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magic/toolchains/emscripten/defs.mak

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Add WASM entry point and Emscripten build wiring The pieces that make Magic actually buildable as a WASM library. * magic/magicWasm.c — new headless entry point exporting four functions used by the JS wrapper: - magic_wasm_init() idempotent initialisation - magic_wasm_run_command(s) dispatch one Magic command - magic_wasm_source_file(p) execute a script from the VFS - magic_wasm_update() drive a display-update cycle Sets CAD_ROOT=/ if unset, so embedded technology files under /magic/sys/ resolve correctly. Centers the command point inside GrScreenRect so commands route to the layout window client rather than the border/window-management client. * utils/main.c, utils/main.h — split magicMain() into magicMainInit() + the dispatch loop. magicMainInit is idempotent (a static flag guards against re-initialisation) so JS callers can call any of the four wasm entry points first without sequencing. * magic/Makefile — adds the WASM link target, gated by MAKE_WASM=1 set from toolchains/emscripten/defs.mak. Conditionally compiles magicWasm.c into the main binary, links to magic.js and runs post-build.sh on the result. * toolchains/emscripten/defs.mak — Emscripten linker flags (WASM=1, MODULARIZE, EXPORT_ES6, ALLOW_MEMORY_GROWTH, INITIAL_MEMORY=32M, STACK_SIZE=5M), the four EXPORTED_FUNCTIONS, and the embed-file bindings for the technology files under /magic/sys/. * toolchains/emscripten/post-build.sh — patches Emscripten's ESM output so it works in pure Node.js ESM: aliases require() through createRequire, injects __filename / __dirname shims, and resyncs the ___emscripten_embedded_file_data constant from the wasm global section if Emscripten emitted a stale value. Idempotent and pinned to emsdk 3.1.56 (see WARNING in the header). * toolchains/emscripten/README.md — full build documentation: quick-start via npm/build.sh, manual build, list of embedded files, exported C API, JavaScript usage example, and notes on CAD_ROOT, DISPLAY_SUSPEND, and the signal-API stubs. * .gitignore — adds the WASM artefacts (magic.js, magic.wasm, magic.symbols), tightens the editor/OS cruft list, and keeps toolchains/emscripten/defs.mak tracked despite the `defs.mak` ignore rule.
2026-05-04 13:31:41 +02:00
# WASM-specific make additions — append to the configure-generated defs.mak.
#
# Usage (matches what the CI workflow does):
#
# source <emsdk>/emsdk_env.sh
# CFLAGS="--std=c17 -D_DEFAULT_SOURCE=1 -DEMSCRIPTEN=1 -g" \
# emconfigure ./configure --without-cairo --without-opengl --without-x \
# --without-tk --without-tcl \
# --disable-readline --disable-compression \
# --target=asmjs-unknown-emscripten
# cat toolchains/emscripten/defs.mak >> defs.mak
# emmake make depend
# emmake make -j$(nproc) modules libs
# emmake make techs
# emmake make mains
# Activate the WASM link target in magic/Makefile.
MAKE_WASM = 1
# Emscripten linker flags.
# The link step runs from the magic/ subdirectory, so embed-file paths
# are relative to that directory (../scmos, ../windows/...).
TOP_EXTRA_LIBS += \
-sWASM=1 \
-sMODULARIZE=1 \
-sEXPORT_ES6=1 \
-sEXPORTED_FUNCTIONS=_magic_wasm_init,_magic_wasm_run_command,_magic_wasm_source_file,_magic_wasm_update \
-sEXPORTED_RUNTIME_METHODS=cwrap,ccall,FS,setValue,getValue \
-sALLOW_MEMORY_GROWTH=1 \
-sINITIAL_MEMORY=33554432 \
-sSTACK_SIZE=5242880 \
-sASSERTIONS=1 \
-sENVIRONMENT=node,web,worker \
-sFORCE_FILESYSTEM=1 \
--embed-file ../scmos@/magic/sys/current \
--embed-file ../windows/windows7.glyphs@/magic/sys/windows7.glyphs \
--embed-file ../windows/windows7.glyphs@/magic/sys/bw.glyphs