subagent transcript

session 17f09f89 · workflow wf_4e894f41
← 17f09f89 · archive
delegated task
You are working on the FreeCAD -> WebAssembly port. Ground EVERYTHING in the real code; do not guess. - Source tree: /home/magik6k/lcad-wasm/freecad-p
▸ Magik
You are working on the FreeCAD -> WebAssembly port. Ground EVERYTHING in the real code; do not guess. - Source tree: /home/magik6k/lcad-wasm/freecad-port/FreeCAD (git branch wasm-port). CMake build dir (out-of-source, already configured): /opt/toolchains/src/freecad-gui-build — read /opt/toolchains/src/freecad-gui-build/CMakeCache.txt for BUILD_* flags and dep paths. Build binary: bin/FreeCAD.wasm (~180 MB). - Toolchain: emscripten, ASYNCIFY + JS exceptions (-fexceptions), SINGLE-THREADED (no pthreads). Static CPython 3.14 + static Qt 6.11 (wasm) + static OCCT + static Coin3D. Everything is statically linked; there is NO dlopen — Python C-extension modules are registered statically via PyImport_AppendInittab in the generated file src/Main/WasmInittab.cpp / WasmInittabGui.cpp (see also freecadWasmRegisterInittab in src/Main/MainGui.cpp). - CRITICAL wasm constraints you MUST check for and design around: (1) THREADING HANGS: any std::thread ctor / std::async(default or async policy) / QThreadPool / QtConcurrent / QThread worker HANGS or throws (no pthreads). Fix pattern: force synchronous/deferred on __EMSCRIPTEN__ (e.g. std::launch::deferred), or #ifndef FC_OS_WASM guard the worker and run inline. Example already in-tree: Mod/Sketcher/App/planegcs/GCS.cpp forced std::launch::deferred; App/Application.cpp guards _recomputeThread with #ifndef FC_OS_WASM; Gui/ProgressBar.cpp skips qApp->processEvents() on __EMSCRIPTEN__. (2) MODAL DIALOGS / NESTED EVENT LOOPS: QDialog::exec()/QMessageBox::exec()/QEventLoop::exec() may deadlock under asyncify when driven from outside the main loop. Task-panel (docked, non-modal) dialogs are preferred. (3) Reentrant ccalls from JS during asyncify suspend corrupt state — a QTimer command-pump (/fc-cmd.py) exists for JS->Python. QtWebEngine has NO wasm port (Web workbench / in-app help / real Start page can't use it). (4) Wasm guards used in-tree: __EMSCRIPTEN__ (compiler-provided) and FC_OS_WASM (FreeCAD-defined) — both are defined on wasm. - Built modules today: Part, Sketcher, Material, Start (+ kernel). Everything else is OFF (see BUILD_* in CMakeCache). - PySide/shiboken: FREECAD_USE_PYSIDE=OFF, FREECAD_USE_SHIBOKEN=OFF, PySide6_DIR/Shiboken6_DIR NOTFOUND. Python 'PySide'/'shiboken6' import fails at runtime ("Cannot load shiboken6"). Many workbenches (Draft, BIM, most task dialogs) are Python+PySide and cannot function without it. DELIVERABLES — do BOTH: 1) Write a thorough, concrete, ready-to-apply plan to /home/magik6k/lcad-wasm/porting/<SLUG>/plan.md — include: exact CMake flags/edits, exact source edits (file + before/after or unified-diff snippets precise enough to apply), any NEW files (full contents), external-dependency build recipes (how to build each dep for this emscripten/asyncify toolchain), a threading-hazard list (grep the real files, give file:line + the exact construct + the exact fix), a modal-dialog-hazard list, the PyImport_AppendInittab lines to add, an ordered step list, and an effort/risk estimate. Put any patch files or new-file contents as separate files in that dir too. 2) Return the structured summary (the schema). Keep summary fields concise; the depth goes in plan.md. Your returned text IS the structured object. Be exhaustive and correct — token cost is not a concern. Verify claims against the actual files (use grep/read). If a dependency has no known wasm port, say so plainly and estimate the porting effort. === YOUR SCOPE: Build PySide6+shiboken6 for this wasm toolchain (slug: pyside-recipe) === Produce a concrete recipe to BUILD shiboken6 (host generator, fine) and shiboken6+PySide6 RUNTIME/binding libraries statically for THIS emscripten+asyncify+static-Qt6.11+static-CPython toolchain. Cover: which shiboken/pyside version matches Qt 6.11; host vs target split (generator runs on host); cross-compiling the bindings + libshiboken + libpyside as static libs; disabling QtWebEngine/QtQml/etc bindings to keep size down (target only QtCore/QtGui/QtWidgets); asyncify/EH flags; any threading in libshiboken/libpyside that will hang (grep for std::thread/std::mutex usage patterns and whether they matter single-threaded). Reference Qt's experimental "PySide6 for WebAssembly" approach. Give the exact expected size cost per binding module. Write your full plan + any patch/new-file contents under /home/magik6k/lcad-wasm/porting/pyside-recipe/ (create the dir; plan.md is required). Then return the structured summary with deliverableFile=/home/magik6k/lcad-wasm/porting/pyside-recipe/plan.md.
Fable
thinking
I need to get oriented by examining the available toolchain, PySide/shiboken sources, Qt version, and the memory files to understand what I'm working with.
Fable
I'll research this thoroughly. Let me start by examining the toolchain, Qt version, existing sources, and memory files.
Fable
⚙ Bash {"command": "cat /home/agent/.claude/projects/-home-magik6k-lcad-wasm/memory/wasm-toolchain-eh-encodings.md 2>/dev/null; echo \"=====FREECAD VIEWPORT=====\"; cat /home/agent/.claude/projects/-home-magik6k-lcad-wasm/memory/freecad-wasm-viewp…
tool result
---
name: wasm-toolchain-eh-encodings
description: Shared /opt/toolchains layout for the CAD wasm ports and the wasm-EH encoding pitfalls (legacy try vs try_table) that break linking against qt-jspi
metadata: 
  node_type: memory
  type: project
  originSessionId: b70028ac-3ec1-4bca-a264-591cb7bb1a36
---

The CAD-to-wasm ports (LibreCAD shipped, FreeCAD ongoing, OpenSCAD shipped 2026-07-04) share `/opt/toolchains`: emsdk 4.0.12, `qt-jspi/6.11.1/wasm_singlethread` (static Qt, JSPI + `-fwasm-excep  …[truncated]
Fable
⚙ Bash {"command": "ls /opt/toolchains/ 2>/dev/null; echo \"=====SRC=====\"; ls /opt/toolchains/src/ 2>/dev/null; echo \"=====EMSDK=====\"; which emcc em++ 2>/dev/null; emcc --version 2>/dev/null | head -3", "description": "List toolchain layout"}
tool result
boost-wasm
emsdk
fix-freetype-sjlj.sh
fmt-wasm
freecad-gui-web
gtest-wasm
icu-wasm
include
occt-wasm
oscad-deps
oscad-src
python-wasm
qt
qt-asyncify
qt-jspi
qtsrc
rebuild-deps-407.sh
rebuild-deps-jseh.sh
rebuild-deps-wasmeh.sh
rebuild-qt-asyncify-412.sh
rebuild-qt-asyncify.sh
rebuild-qt-jspi-jseh.sh
rebuild-qt-jspi-wasmeh.sh
rebuild-qt-jspi.sh
src
venv
wasm-opt-4.0.12.bak
xerces-wasm
yaml-wasm
=====SRC=====
OCCT-7_8_1
Python-3.14.4
boost-1.86.0
fmt-11.1.4
freecad-gui-build
ftbase.c.o
googletest-  …[truncated]
Fable
⚙ Bash {"command": "grep -iE \"PYSIDE|SHIBOKEN|Qt6_DIR|Qt6Core_DIR|Python.*EXECUTABLE|Python.*LIBRAR|Python.*INCLUDE|CMAKE_TOOLCHAIN|EMSCRIPTEN\" /opt/toolchains/src/freecad-gui-build/CMakeCache.txt 2>/dev/null | head -60", "description": "Grep CM…
tool result
//If OFF extension-modules do not link against python-libraries
CMAKE_TOOLCHAIN_FILE:FILEPATH=/opt/toolchains/emsdk/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake
EGL_INCLUDE_DIR:PATH=/opt/toolchains/emsdk/upstream/emscripten/cache/sysroot/include
EMSCRIPTEN_FORCE_COMPILERS:BOOL=ON
EMSCRIPTEN_GENERATE_BITCODE_STATIC_LIBRARIES:BOOL=OFF
//Links to the PySide libraries at build time.
FREECAD_USE_PYSIDE:BOOL=OFF
//Links to the shiboken library at build time. If OFF its Python
FREECAD_US  …[truncated]
Fable
thinking
I'm tracking the configuration details across different Qt builds—there's a discrepancy between qt-jspi using the newer wasm-exceptions approach versus the qt-asyncify variant that FreeCAD actually uses with its JavaScript exception handling fallback, and I need to reconcile what the task specifies about ASYNCIFY and exception handling.

Now I'm planning to dig into the CMakeCache to verify the exact compiler flags, check whether there's a host Qt installation available for building tools like the shiboken generator, and search for any PySide sources or Python host tooling in the project structure.
Fable
⚙ Bash {"command": "grep -iE \"CMAKE_CXX_FLAGS|CMAKE_C_FLAGS|EXE_LINKER|ASYNCIFY|EXCEPTION|fexceptions|fwasm\" /opt/toolchains/src/freecad-gui-build/CMakeCache.txt 2>/dev/null | head -40", "description": "Get EH/asyncify flags from cache"}
tool result
CMAKE_CXX_FLAGS:STRING=-fexceptions -DEIGEN_DONT_VECTORIZE -DBOOST_HAS_PTHREADS=1 -DBOOST_STACKTRACE_USE_NOOP
CMAKE_CXX_FLAGS_DEBUG:STRING=-g
CMAKE_CXX_FLAGS_MINSIZEREL:STRING=-Os -DNDEBUG
CMAKE_CXX_FLAGS_RELEASE:STRING=-O3 -DNDEBUG
CMAKE_CXX_FLAGS_RELWITHDEBINFO:STRING=-O2 -g -DNDEBUG
CMAKE_C_FLAGS:STRING=-fexceptions -DXML_DEV_URANDOM
CMAKE_C_FLAGS_DEBUG:STRING=-g
CMAKE_C_FLAGS_MINSIZEREL:STRING=-Os -DNDEBUG
CMAKE_C_FLAGS_RELEASE:STRING=-O3 -DNDEBUG
CMAKE_C_FLAGS_RELWITHDEBINFO:STRING=-O2 -g -  …[truncated]
Fable
⚙ Bash {"command": "echo \"===host qt (for generator)===\"; ls /opt/toolchains/qt/ 2>/dev/null; ls -d /usr/lib/qt6 /usr/lib/x86_64-linux-gnu/cmake/Qt6* 2>/dev/null; which qmake qmake6 2>/dev/null; echo \"===libclang===\"; ls /usr/lib/llvm*/lib/lib…
tool result
===host qt (for generator)===
6.11.1
===libclang===
===pyside anywhere===
===host python===
Python 3.14.4
Python 3.14.4
Fable
⚙ Bash {"command": "cat /opt/toolchains/qt-asyncify/6.11.1/wasm_singlethread/lib/cmake/Qt6/qt.toolchain.cmake 2>/dev/null | grep -iE \"exception|asyncify|QT_HOST|host\" | head; echo \"===qconfig===\"; grep -iE \"VERSION\" /opt/toolchains/qt-asynci…
tool result
# Note that we don't handle QT_ADDITIONAL_HOST_PACKAGES_PREFIX_PATH here, because we would thwart
# our efforts to not accidentally pick up host packages. For now, we say that
    if(NOT CMAKE_HOST_WIN32)
===qconfig===
#ifndef QT_QTCORE_VERSION_H
#define QT_QTCORE_VERSION_H
#define QTCORE_VERSION_STR "6.11.1"
#define QTCORE_VERSION 0x0601101
#endif // QT_QTCORE_VERSION_H
===host qt path from qt-asyncify===
Fable
thinking
The host Python version matches the target at 3.14.4, and there's a real Python binary at `/usr/bin/python3`. I'm also noticing a Qt toolchain at `/opt/toolchains/qt/6.11.1` that I should investigate further. Looking at the FreeCAD WebAssembly build, it's using `-fexceptions` for JavaScript exceptions through Emscripten rather than native WebAssembly exception handling, which is a significant detail for how the entire build is configured.

I need to check whether that Qt installation is the host Qt, verify if libclang is available (since the shiboken generator requires it), and examine the exact build flags used for Qt, particularly around asyncify and exception handling.
Fable
⚙ Bash {"command": "echo \"===/opt/toolchains/qt===\"; ls -la /opt/toolchains/qt/ 2>/dev/null; ls /opt/toolchains/qt/6.11.1/ 2>/dev/null; echo \"===is there a host (gcc/linux) qt?===\"; ls /opt/toolchains/qt/6.11.1/gcc_64 2>/dev/null; find /opt/to…
tool result
===/opt/toolchains/qt===
total 12
drwxr-xr-x  3 agent agent 4096 Jul  3 18:24 .
drwxr-xr-x 21 agent agent 4096 Jul  4 14:17 ..
drwxr-xr-x  4 agent agent 4096 Jul  3 18:24 6.11.1
gcc_64
wasm_singlethread
===is there a host (gcc/linux) qt?===
bin
config_qtbase.opt
config_qtbase.summary
config_qtdeclarative.opt
config_qtdeclarative.summary
config_qtdoc.opt
config_qtdoc.summary
config_qtsvg.opt
config_qtsvg.summary
config_qttools.opt
config_qttools.summary
config_qttranslations.opt
config_qttranslat  …[truncated]
Fable
thinking
I need to set up the Qt host at `/opt/toolchains/qt/6.11.1/gcc_64` (version 6.11.1) as the `-qt-host-path` for the PySide6 target build, and I'm noting that the WebAssembly Qt build was compiled with emscripten, asyncify enabled, static linking, threading disabled, and JavaScript exception handling.

For the build environment, I have Python 3.14.4 on both host and target (with a static libpython3.14.a), but I'll need to install libclang on the host since the shiboken generator requires it. PySide6 versions track Qt versions exactly, so I'm targeting PySide6 6.11.1 to match Qt 6.11.1. Qt has official WebAssembly support for PySide6 documented since the 6.6/6.7 era, and the build process invol  …
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"===shiboken includes===\"; grep -rIl \"shiboken\" src/ --include=*.cpp --include=*.h 2>/dev/null | head -30; echo \"===count===\"; grep -rIl \"shiboken\" src/ --include=*.…
tool result
===shiboken includes===
src/App/ProgramInformation.cpp
src/Gui/CallTips.cpp
src/Gui/PythonWrapper.cpp
===count===
3
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"===which Qt binding modules FreeCAD wraps (PySideWrapper/getPyTypeObject)===\"; grep -rIoh \"Shiboken::Conversions::[A-Za-z]*\" src/ 2>/dev/null | sort -u | head; echo \"=…
tool result
===which Qt binding modules FreeCAD wraps (PySideWrapper/getPyTypeObject)===
Shiboken::Conversions::addPythonToCppValueConversion
Shiboken::Conversions::copyToPython
Shiboken::Conversions::createConverter
Shiboken::Conversions::getConverter
Shiboken::Conversions::getPythonTypeObject
Shiboken::Conversions::pointerToPython
Shiboken::Conversions::registerConverterName
Shiboken::Conversions::setPythonToCppPointerFunctions
===PySide module imports in C++===
    264 PySide.QtCore
     53 PySide.QtGui
  …[truncated]
Fable
thinking
I've identified the five core PySide6 modules that FreeCAD's C++ layer requires: QtCore, QtGui, QtWidgets, QtPrintSupport, and QtUiTools, with QtSvg potentially used at the Python workbench level. Now I need to examine how PythonWrapper.cpp handles module loading through its loadPySideModule function, which is crucial for understanding static linking constraints since there's no dynamic loading available.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; sed -n '860,960p' src/Gui/PythonWrapper.cpp", "description": "Read loadPySideModule mechanism"}
tool result
    if (type) {
        PyObject* pyobj = Shiboken::Object::newObject(type, widget, false, false, wrapperName);
        WrapperManager::instance().addQObject(widget, pyobj);
        return Py::asObject(pyobj);
    }
#else
    // Access shiboken/PySide via Python
    Py::Object obj = qt_wrapInstance<QWidget*>(widget, typeName, "QtWidgets");
    if (!obj.isNull()) {
        return obj;
    }
#endif
    throw Py::RuntimeError("Failed to wrap widget");
}

const char* PythonWrapper::ge  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; sed -n '600,700p' src/Gui/PythonWrapper.cpp", "description": "Read PythonWrapper toPython/wrap area"}
tool result
QObject* PythonWrapper::toQObject(const Py::Object& pyobject)
{
    return qt_getCppType<QObject>(pyobject.ptr());
}

qsizetype PythonWrapper::tryEnum(PyObject* pyPtr)
{
    if (PyObject* number = PyNumber_Long(pyPtr)) {
        Py::Long longObj(number, true);
        return longObj.as_long();
    }

    // if PyNumber_Long failed then an exception is set
    PyErr_Clear();

    Py::Object object(pyPtr);
    if (object.hasAttr(std::string("value"))) {
        Py::Long longObj(ob  …[truncated]
Fable
thinking
I need to trace through the loadPySideModule function and understand how the import machinery works, particularly around the type array initialization through Shiboken::Module::import and the wrapper import logic in that earlier section.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; grep -n \"loadPySideModule\\|Shiboken::Module::import\\|getTypeForName\\|Cannot load shiboken\\|import PySide\\|PyImport_ImportModule\\|Shiboken::importModule\" src/Gui/PythonWra…
tool result
310:static bool loadPySideModule(const std::string& moduleName, Shiboken::Module::TypeInitStruct*& types)
312:static bool loadPySideModule(const std::string& moduleName, PyTypeObject**& types)
318:            Shiboken::Module::import(getPySideModuleName(moduleName).c_str())
485:    PyObject* obj = PyImport_ImportModule(ModuleShiboken);
496:    PyObject* obj = PyImport_ImportModule(name.c_str());
904:    return loadPySideModule("QtCore", SbkPySide_QtCoreTypes);
909:    return loadPySideModu  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; sed -n '300,340p' src/Gui/PythonWrapper.cpp; echo \"===475-520===\"; sed -n '475,525p' src/Gui/PythonWrapper.cpp", "description": "Read import machinery"}
tool result
static std::string getPySideModuleName(const std::string& moduleName)
{
    std::string name(ModulePySide);
    name += '.';
    name += moduleName;

    return name;
}

#ifdef HAVE_SHIBOKEN_TYPEINITSTRUCT
static bool loadPySideModule(const std::string& moduleName, Shiboken::Module::TypeInitStruct*& types)
#else
static bool loadPySideModule(const std::string& moduleName, PyTypeObject**& types)
#endif
{
#if defined(HAVE_SHIBOKEN) && defined(HAVE_PYSIDE)
    if (!types) {
          …[truncated]
Fable
thinking
I'm working through the FreeCAD static build setup and realizing that `Shiboken::Module::import()` internally calls `PyImport_ImportModule`, which requires registering modules through `PyImport_AppendInittab` in a static build. I need to register both the `shiboken6.Shiboken` module and the `PySide6` modules in the inittab.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; grep -rn \"ModuleShiboken\\s*=\\|ModulePySide\\s*=\\|define ModuleShiboken\\|define ModulePySide\\|constexpr.*ModuleShiboken\\|constexpr.*ModulePySide\\|HAVE_SHIBOKEN_TYPEINITSTR…
tool result
src/Gui/PythonWrapper.cpp:38:// #undef HAVE_SHIBOKEN2
src/Gui/PythonWrapper.cpp:74:#ifdef HAVE_SHIBOKEN2
src/Gui/PythonWrapper.cpp:77:#  define HAVE_PYSIDE
src/Gui/PythonWrapper.cpp:89:#endif   // HAVE_SHIBOKEN2
src/Gui/PythonWrapper.cpp:101:#  define HAVE_PYSIDE
src/Gui/PythonWrapper.cpp:107:#  define HAVE_SHIBOKEN_TYPEINITSTRUCT
src/Gui/PythonWrapper.cpp:122:#ifdef HAVE_PYSIDE
src/Gui/PythonWrapper.cpp:124:#endif  // HAVE_PYSIDE
src/Gui/PythonWrapper.cpp:149:#if defined(HAVE_SHIBOKEN2)  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; sed -n '160,200p' src/Gui/PythonWrapper.cpp; echo \"===cmake FindPySide/Shiboken main===\"; sed -n '1,80p' cMake/FindShiboken.cmake 2>/dev/null | grep -niE \"SHIBOKEN_INCLUDE|SHI…
tool result
# if !defined(HAVE_PYSIDE2)
constexpr const char* ModuleShiboken = "shiboken2";
# endif
constexpr const char* ModulePySide = "PySide2";
#elif defined(HAVE_SHIBOKEN6)
# ifdef HAVE_SHIBOKEN_TYPEINITSTRUCT
Shiboken::Module::TypeInitStruct* SbkPySide6_QtCoreTypes = nullptr;
Shiboken::Module::TypeInitStruct* SbkPySide6_QtGuiTypes = nullptr;
Shiboken::Module::TypeInitStruct* SbkPySide6_QtWidgetsTypes = nullptr;
Shiboken::Module::TypeInitStruct* SbkPySide6_QtPrintSupportTypes = nullptr;
Shibo  …[truncated]
Fable
thinking
I've got a clear picture of the FreeCAD module structure now. Next I need to understand how PySide6 and shiboken6 handle threading in an Emscripten static build, so I should search through the source code once I download it to see what threading primitives they're using. Given potential network constraints, I should first check what's already available locally.
Fable
⚙ Bash {"command": "echo \"===clang/llvm on host===\"; ls /usr/lib/llvm-*/lib/libclang.so* 2>/dev/null; ls /usr/bin/clang* 2>/dev/null; apt-cache policy libclang-dev 2>/dev/null | head -5; echo \"===pip pyside available?===\"; pip download --no-de…
tool result
===clang/llvm on host===
libclang-dev:
  Installed: (none)
  Candidate: 1:21.1.6-71
  Version table:
     1:21.1.6-71 500
===pip pyside available?===
ERROR: Could not find a version that satisfies the requirement pyside6 (from versions: none)
ERROR: No matching distribution found for pyside6
===network code.qt.io===
HTTP/1.0 200 Connection established

HTTP/1.1 302 Found
===pypi===
HTTP/1.0 200 Connection established

HTTP/2 200
Fable
thinking
Network connectivity to code.qt.io and PyPI is working, and libclang-dev is installable with LLVM 21. Now I need to check the PySide setup documentation for WebAssembly builds to get the exact cross-compilation flags—specifically looking at the wheel utilities and build scripts to understand the proper configuration.
Fable
⚙ Bash {"command": "cd /tmp; for f in \"tools/cross_compile_qtwebassembly.py\" \"build_scripts/platforms/emscripten.py\" \"coin/instructions.yaml\"; do echo \"===== $f =====\"; curl -sS --max-time 20 \"https://code.qt.io/cgit/pyside/pyside-setup.g…
tool result
===== tools/cross_compile_qtwebassembly.py =====
<!DOCTYPE html>
<html lang='en'>
<head>
<title>pyside/pyside-setup.git - Git super project for PySide
</title>
<meta name='generator' content='cgit v1.2.3'/>
<meta name='robots' content='index, nofollow'/>
<link rel='stylesheet' type='text/css' href='/cgit.css'/>
<link rel='shortcut icon' href='/favicon.ico'/>
<link rel='alternate' title='Atom feed' href='https://code.qt.io/cgit/pyside/pyside-setup.git/atom/?h=6.11' type='application/atom+xml'/>
<  …[truncated]
Fable
thinking
My initial guesses for the file paths didn't work out, so I need to actually inspect the repository structure. Let me do a shallow clone of the pyside-setup 6.11 branch to see what files are actually there, or at least fetch the tree listing to find the correct file names.
Fable
⚙ Bash {"command": "cd /tmp; rm -rf pyside-setup; timeout 300 git clone --depth 1 --branch 6.11 --single-branch https://code.qt.io/pyside/pyside-setup.git 2>&1 | tail -5; echo \"EXIT $?\"; ls pyside-setup 2>/dev/null | head", "description": "Shall…
tool result
Cloning into 'pyside-setup'...
EXIT 0
CMakeLists.txt
LICENSES
README.md
README.pyside6.md
README.pyside6_addons.md
README.pyside6_essentials.md
README.pyside6_examples.md
README.shiboken6-generator.md
README.shiboken6.md
SECURITY.md
Fable
thinking
I've got the PySide 6.11 source now, so I'm looking for the WebAssembly and Emscripten cross-compilation setup, documentation on threading in libshiboken and libpyside, and the relevant build configuration flags.
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; git log -1 --format=\"%H %d %ci\"; echo \"===wasm/emscripten files===\"; grep -rilE \"wasm|emscripten\" tools/ build_scripts/ 2>/dev/null | head -40; echo \"===doc===\"; find sources -ipath \"*webassembly*…
tool result
cc7c88a7f0827df52fa4252b8026dc921fc50630  (grafted, HEAD -> 6.11, origin/6.11) 2026-07-04 09:28:05 +0000
===wasm/emscripten files===
===doc===
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"===grep wasm across repo===\"; grep -rilE \"wasm|emscripten|WEBASSEMBLY\" --include=*.py --include=*.txt --include=*.cmake --include=*.md --include=*.rst . 2>/dev/null | head -40", "description": "G…
tool result
===grep wasm across repo===
sources/pyside6/doc/considerations.rst
sources/pyside6/doc/faq/distribution.rst
sources/pyside6/doc/extras/QtMultimedia.rst
sources/pyside6/doc/building_from_source/index.rst
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"===building_from_source index===\"; ls sources/pyside6/doc/building_from_source/; echo \"===grep wasm in index.rst===\"; grep -niE \"wasm|emscripten|webassembly|cross\" sources/pyside6/doc/building_…
tool result
===building_from_source index===
index.rst
linux.rst
macOS.rst
windows.rst
===grep wasm in index.rst===
82:.. important:: |project| does not yet support WebAssembly and the mobile operating systems (Android or iOS).
137:.. _cross_compilation:
139:Cross Compilation
142:Starting from 6.3, it is possible to cross-compile Shiboken (module), and
147:   machine to cross-compile to a Linux target platform.
149:Cross compiling software is a valid use case that many projects rely on,
153:the build system  …[truncated]
Fable
thinking
So the official 6.11 documentation states WebAssembly isn't supported yet, but there's an experimental approach that Qt has demonstrated through talks and examples. The mainline pyside-setup doesn't include a wasm toolchain by default in 6.11, making this a genuinely experimental effort. I should look into the coin CI approach from the qt5 super-repo that handles pyside wasm builds, and check what cross-compilation tools and setup.py options are available.

Now I need to examine the cross-compilation documentation and the build tools directory to understand the available flags like --qt-host-path, --plat-name, and --shiboken-host-path that control the target platform configuration.
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; sed -n '137,340p' sources/pyside6/doc/building_from_source/index.rst", "description": "Read cross-compilation doc section"}
tool result
.. _cross_compilation:

Cross Compilation
-----------------

Starting from 6.3, it is possible to cross-compile Shiboken (module), and
PySide. This functionality is still in Technical Preview, which means it could
change in the future releases.

.. important:: The only supported configuration is using a host Linux
   machine to cross-compile to a Linux target platform.

Cross compiling software is a valid use case that many projects rely on,
however, it is a complicated process that might fail d  …[truncated]
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; sed -n '340,420p' sources/pyside6/doc/building_from_source/index.rst; echo \"=== setup.py cross flags ===\"; grep -niE \"shiboken-host|host-path|plat-name|cross|toolchain|target-path|sysroot|standalone\" b…
tool result
~~~~~~~~~~~~~~~~~~~~~~

After you have installed the prerequisites and copied the necessary files, you
should have the following:

* The compilers to cross compile (``gcc-argm-10.2-...``),
* The target sysroot (``rpi-sysroot``),
* The toolchain cmake file (``toolchain-aarch64.cmake``),
* The ``pyside-setup`` repository,

An example of the ``setup.py`` invocation might look like the following:

.. code-block:: bash

    python setup.py bdist_wheel \
        --parallel=8 --ignore-git --reuse-build  …[truncated]
Fable
thinking
The setup.py cross-compile approach won't work for our static WASM build since it's designed for shared library wheels, but we need static libraries linked directly into FreeCAD.wasm with modules registered through PyImport_AppendInittab instead. This requires a custom build strategy that bypasses the standard wheel machinery and works with the PySide CMake setup differently.

The core challenge is that PySide's CMake builds shared libraries by default with no upstream support for static builds. I need to dig into the actual CMake configuration to understand whether static compilation is feasible, figure out the module initialization function names that get generated, and check for threading  …
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== libshiboken threading ===\"; grep -rniE \"std::thread|std::async|std::mutex|std::recursive_mutex|call_once|thread_local|QThread|std::condition_variable|pthread\" sources/shiboken6/libshiboken/ 2…
tool result
=== libshiboken threading ===
sources/shiboken6/libshiboken/bindingmanager.cpp:177:    std::recursive_mutex wrapperMapLock;
sources/shiboken6/libshiboken/bindingmanager.cpp:237:    std::lock_guard<std::recursive_mutex> guard(wrapperMapLock);
sources/shiboken6/libshiboken/bindingmanager.cpp:259:    std::lock_guard<std::recursive_mutex> guard(wrapperMapLock);
sources/shiboken6/libshiboken/bindingmanager.cpp:289:        std::lock_guard<std::recursive_mutex> guard(m_d->wrapperMapLock);
sources/shibo  …[truncated]
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== libpyside threading ===\"; grep -rniE \"std::thread|std::async|std::mutex|std::recursive_mutex|call_once|thread_local|QThread|QMutex|std::condition_variable|pthread\" sources/pyside6/libpyside/ …
tool result
=== libpyside threading ===
sources/pyside6/libpyside/dynamicslot.cpp:21:#include <QtCore/qthread.h>
sources/pyside6/libpyside/dynamicslot.cpp:377:        if (app == nullptr || QThread::currentThread() == app->thread()) {
sources/pyside6/libpyside/pyside.cpp:50:#include <QtCore/qmutex.h>
sources/pyside6/libpyside/pyside.cpp:52:#include <QtCore/qthread.h>
sources/pyside6/libpyside/pyside.cpp:75:static void thread_local *qobjectNextAddr;
sources/pyside6/libpyside/pyside.cpp:451:    // QThreadPool:  …[truncated]
Fable
thinking
Looking at the threading situation in libshiboken — it uses `std::recursive_mutex` for synchronization, which works fine in emscripten's single-threaded environment since the mutex operations are effectively no-ops. There's no actual thread spawning happening, so the library is thread-safe for this context. I'm also checking how `pthread_self()` is handled in the helper code, which emscripten provides support for even without explicit pthread flags.

For libpyside, the threading calls like `QThread::currentThread()` and `QThread::isMainThread()` are just queries that return the main thread on single-threaded Qt-wasm builds — they don't create threads. `QMutex` is also a no-op in single-threa  …
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== pyside.cpp 440-460 ===\"; sed -n '440,470p' sources/pyside6/libpyside/pyside.cpp; echo \"=== dynamicslot 360-390 ===\"; sed -n '360,395p' sources/pyside6/libpyside/dynamicslot.cpp; echo \"=== gr…
tool result
=== pyside.cpp 440-460 ===

    Shiboken::BindingManager &bm = Shiboken::BindingManager::instance();
    SbkObject *pyQApp = bm.retrieveWrapper(app);
    PyTypeObject *pyQObjectType = PySide::qObjectType();
    assert(pyQObjectType);

    void *data[2] = {pyQApp, pyQObjectType};
    bm.visitAllPyObjects(&destructionVisitor, &data);

    // in the end destroy app
    // Allow threads because the destructor calls
    // QThreadPool::globalInstance().waitForDone() which may deadlock on the GIL
      …[truncated]
Fable
thinking
Looking at the thread safety implications for single-threaded WebAssembly — in the dynamicslot.cpp case, the current thread check will always evaluate to true since there's only one thread, so the tracker gets created with the app as parent and the moveToThread branch is never reached. The pyside.cpp section is starting to examine thread-related operations but appears to be cut off mid-thought.

The key finding is that libshiboken and libpyside don't actually spawn any threads themselves — they only use mutexes (which are no-ops in single-threaded wasm) and thread identity checks (which always return the main thread). This means they're safe to use in single-threaded asyncify WebAssembly wit  …
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== shiboken libshiboken CMake shared/static ===\"; grep -niE \"add_library|SHARED|STATIC|LIBRARY_OUTPUT|POSITION_INDEP\" sources/shiboken6/libshiboken/CMakeLists.txt | head; echo; echo \"=== PySide…
tool result
=== shiboken libshiboken CMake shared/static ===
87:sbkstaticstrings.cpp sbkstaticstrings.h sbkstaticstrings_p.h
110:add_library(libshiboken SHARED ${libshiboken_SRC})
112:    add_library(Shiboken6::libshiboken ALIAS libshiboken)
136:# On macOS and Linux we don't link against the python shared / static library,
155:set_target_properties(libshiboken PROPERTIES OUTPUT_NAME "shiboken6${shiboken6_SUFFIX}${PYTHON_SHARED_LIBRARY_SUFFIX}"
187:        sbkstaticstrings.h

=== PySide6 __init__.py (support  …[truncated]
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== how module init generated ===\"; grep -rniE \"PyInit|SbkModule|moduleInit|PyModuleDef|multiPhaseInit|create_module|SBK_MODULE\" sources/shiboken6/generator/shiboken/*.cpp 2>/dev/null | grep -iE …
tool result
=== how module init generated ===
=== search writeModule ===
ugrep: warning: sources/shiboken6/generator/: No such file or directory
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== find generator sources ===\"; find sources/shiboken6 -name \"*.cpp\" -path \"*generator*\" | head; echo \"=== grep PyInit ===\"; grep -rniE \"PyInit_|SBK_MODULE_INIT|PyModuleDef\" sources/shibok…
tool result
=== find generator sources ===
=== grep PyInit ===
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== shiboken6 tree top ===\"; find sources/shiboken6 -maxdepth 2 -type d | head -30; echo \"=== grep whole repo for PyInit_ ===\"; grep -rn \"PyInit_\" --include=*.cpp --include=*.h --include=*.py .…
tool result
=== shiboken6 tree top ===
sources/shiboken6
sources/shiboken6/doc
sources/shiboken6/config.tests
sources/shiboken6/shibokenmodule
sources/shiboken6/tests
sources/shiboken6/libshiboken
sources/shiboken6/cmake
sources/shiboken6/data
sources/shiboken6/doc/_static
sources/shiboken6/doc/images
sources/shiboken6/doc/_templates
sources/shiboken6/doc/scripts
sources/shiboken6/doc/_themes
sources/shiboken6/doc/examples
sources/shiboken6/config.tests/target_qt_info
sources/shiboken6/config.tests/target_q  …[truncated]
Fable
thinking
So the generator source lives in a separate `sources/shiboken6_generator/` directory, and the key pattern is that generated module inits use `PyInit_<Module>` with the proper C exports. There's a perfect reference example in `examples/scriptableapplication/pythonutils.cpp` that demonstrates exactly how to do static embedding with `PyImport_AppendInittab()` — that's the canonical approach I should follow.
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== cppgenerator PyInit 6960-7010 ===\"; sed -n '6960,7010p' sources/shiboken6_generator/generator/shiboken/cppgenerator.cpp; echo \"=== libshiboken/embed dir ===\"; ls sources/shiboken6/libshiboken…
tool result
=== cppgenerator PyInit 6960-7010 ===
                             + " in "_L1 + moduleName());

        collectFullTypeNamesArray(typeNames);

        for (const auto &typeName : std::as_const(typeNames))
            s << "{nullptr, \"" << typeName << "\"},\n";

        s << "{nullptr, nullptr}\n" << outdent << "};\n\n";
    }

    s << "// Create an array of primitive type converters for the current module.\n"
        << "static SbkConverter *sbkConverters[SBK_" << moduleName()
        << "_CO  …[truncated]
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== scriptableapplication pythonutils.cpp ===\"; sed -n '1,90p' examples/scriptableapplication/pythonutils.cpp", "description": "Read embedding example"}
tool result
=== scriptableapplication pythonutils.cpp ===
// Copyright (C) 2017 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

#include "pythonutils.h"

#include <QtCore/QByteArray>
#include <QtCore/QCoreApplication>
#include <QtCore/QDebug>
#include <QtCore/QOperatingSystemVersion>
#include <QtCore/QStringList>
#include <QtCore/QTemporaryFile>
#include <QtCore/QDir>

#include <sbkpython.h>
#include <sbkconverter.h>
#include <sbkmodule.h>

/* from AppLib bindings *  …[truncated]
Fable
thinking
So this is the standard static-embedding approach and it's fully supported with canonical examples available. Looking at libshiboken's embedding setup, the signature module gets compiled directly into libshiboken as a C array containing zipped Python files, which works fine on wasm, though there's a consideration about how this integrates with the static build process.

For actually building the bindings statically, I'm thinking through a two-phase approach: first build the shiboken6 generator on the host machine (which needs libclang and host Qt), then on the wasm target side, compile libshiboken as a static library, run the host generator against the wasm Qt headers to produce the binding   …
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== module add_library in shiboken helpers (ShibokenHelpers/PySideHelpers) ===\"; grep -rniE \"add_library|MODULE|SHARED|LIBRARY_OUTPUT|create_generator_target|shiboken_.*module\" sources/shiboken6/…
tool result
=== module add_library in shiboken helpers (ShibokenHelpers/PySideHelpers) ===
sources/pyside6/libpyside/CMakeLists.txt:98:add_library(pyside6 SHARED ${libpyside_SRC} ${other_files})
sources/pyside6/libpyside/CMakeLists.txt:99:add_library(PySide6::pyside6 ALIAS pyside6)
sources/pyside6/libpyside/CMakeLists.txt:117:                      OUTPUT_NAME "pyside6${pyside6_SUFFIX}${SHIBOKEN_PYTHON_SHARED_LIBRARY_SUFFIX}"
sources/pyside6/cmake/PySideSetup.cmake:9:list(APPEND CMAKE_MODULE_PATH "${CMAKE_CU  …[truncated]
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== PySideModules.cmake create_pyside_module 63-210 ===\"; sed -n '63,210p' sources/pyside6/cmake/Macros/PySideModules.cmake", "description": "Read create_pyside_module macro"}
tool result
=== PySideModules.cmake create_pyside_module 63-210 ===
macro(create_pyside_module)
    pyside_parse_all_arguments(
        "module" # Prefix
        "create_pyside_module" # Macro name
        "" # Flags
        "NAME;TYPESYSTEM_PATH;TYPESYSTEM_NAME" # Single value
        "INCLUDE_DIRS;LIBRARIES;DEPS;SOURCES;STATIC_SOURCES;DROPPED_ENTRIES;GLUE_SOURCES;ADDITIONAL_INCLUDE_DIRS" # Multival
        ${ARGN} # Number of arguments given when the macros is called
        )

    if ("${module_NAME}" ST  …[truncated]
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; sed -n '210,320p' sources/pyside6/cmake/Macros/PySideModules.cmake", "description": "Read rest of create_pyside_module (target creation)"}
tool result
    # comes as a default requirement for building PySide6. As such for
    # cross-compiling in linux, we use the clang compiler from the installed
    # libclang itself.
    if (CMAKE_CROSSCOMPILING)
        list(APPEND shiboken_command "--platform=${CMAKE_SYSTEM_NAME}"
                                     "--arch=${CMAKE_SYSTEM_PROCESSOR}"
                                     "--compiler-path=${CMAKE_CXX_COMPILER}")
    endif()

    if(CMAKE_ANDROID_ARCH_LLVM_TRIPLE)
        message(STATUS "Bu  …[truncated]
Fable
thinking
So modules are built as Python extension modules using shiboken to generate the source files, and there's a post-build step that imports the module to generate type-hint stubs—though this import step needs to be skipped for cross-compilation and WebAssembly targets since the module won't be importable in those contexts.

The realistic approach for WebAssembly would be to build a host generator and host PySide first to get the necessary tooling, then manually run shiboken against the wasm Qt headers to emit binding code, compile everything as static archives with emcc, and link them into FreeCAD. Since there's no official WebAssembly support and no wasm path in setup.py, this is a significant  …
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== stub / pyi generation disable options ===\"; grep -rniE \"DISABLE_PYI|no.?pyi|generate_pyi|pyi_option|QUIET_BUILD|GENERATE_PYI|BUILD_TESTS|stubgen|\\.pyi\" sources/pyside6/cmake/*.cmake CMakeLis…
tool result
=== stub / pyi generation disable options ===

=== PySide6/__init__.py.in ===
import os
import sys
from pathlib import Path
from types import ModuleType
# mypy: disable-error-code="name-defined"

# __all__ is computed below.
__pre_all__ = [@init_modules@]
__version__ = "@FINAL_PACKAGE_VERSION@"
__version_info__ = (@BINDING_API_MAJOR_VERSION@, @BINDING_API_MINOR_VERSION@, @BINDING_API_MICRO_VERSION@, "@BINDING_API_PRE_RELEASE_VERSION_TYPE@", "@BINDING_API_PRE_RELEASE_VERSION@")

SKIP_MYPY_TEST =   …[truncated]
Fable
thinking
Looking at how PySide6 imports from shiboken6, I need to understand the module structure — the `__init__.py` does `from shiboken6 import Shiboken`, but FreeCAD's ModuleShiboken constant just references the `"shiboken6"` package itself, so I need to set up the shiboken6 package with its `__init__.py` properly exposing the Shiboken extension module.

Now I'm verifying a few key details: the PyInit function name for the shiboken module, whether the host generator properly links libclang, and checking which optional modules like QtUiTools and QtPrintSupport are actually buildable and what their dependencies are.
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== shibokenmodule init name + init.py ===\"; ls sources/shiboken6/shibokenmodule/; grep -rniE \"PyInit|MODULE|OUTPUT_NAME|Shiboken\\b\" sources/shiboken6/shibokenmodule/CMakeLists.txt | head; echo …
tool result
=== shibokenmodule init name + init.py ===
CMakeLists.txt
Shiboken.pyi
__init__.py.in
_config.py.in
files.dir
nothing.h
py.typed.in
shibokenmodule.cpp
shibokenmodule.txt.in
typesystem_shiboken.xml
sources/shiboken6/shibokenmodule/CMakeLists.txt:4:project(shibokenmodule)
sources/shiboken6/shibokenmodule/CMakeLists.txt:6:configure_file("${CMAKE_CURRENT_SOURCE_DIR}/shibokenmodule.txt.in"
sources/shiboken6/shibokenmodule/CMakeLists.txt:7:               "${CMAKE_CURRENT_BINARY_DIR}/shibokenmodule.txt  …[truncated]
Fable
thinking
I've found the key pieces: the Shiboken module initializer is `PyInit_Shiboken` from the wrapper source, and there's a support module with embedded Python files. The generator requires libclang, and I'm now looking at how the embedding process works — the embedding generator zips together the support and signature Python files into a C array that gets compiled in.

There's a runtime signature module setup that could be disabled via `SHIBOKEN_DISABLE_SIGNATURE` if needed on WASM, though it's not critical for the plan. The more pressing concern is the exception handling model — PySide bindings throw and catch C++ exceptions across the Python boundary, so everything needs to be built with `-fex  …
Fable
I have enough grounding. Let me verify a couple final details then write the plan.
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; echo \"=== essential modules definition ===\"; grep -rniE \"ALL_ESSENTIAL_MODULES|collect_essential\" sources/pyside6/cmake/Macros/PySideModules.cmake sources/pyside6/cmake/*.cmake 2>/dev/null | head; sed …
tool result
=== essential modules definition ===
sources/pyside6/cmake/PySideHelpers.cmake:72:macro(collect_essential_modules)
sources/pyside6/cmake/PySideHelpers.cmake:76:    set(ALL_ESSENTIAL_MODULES
sources/pyside6/cmake/PySideHelpers.cmake:187:    list(FIND ALL_ESSENTIAL_MODULES "${shortname}" essentialIndex)
sources/pyside6/cmake/PySideSetup.cmake:169:collect_essential_modules()
sources/pyside6/cmake/PySideSetup.cmake:177:    set(MODULES "${ALL_ESSENTIAL_MODULES};${ALL_OPTIONAL_MODULES};${PURE_PYTHON_M  …[truncated]
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup; sed -n '72,110p' sources/pyside6/cmake/PySideHelpers.cmake", "description": "Read essential modules list"}
tool result
macro(collect_essential_modules)
    # Collect all essential modules.
    # note: the order of this list is relevant for dependencies.
    # For instance: Qt5Printsupport must come before Qt5WebKitWidgets.
    set(ALL_ESSENTIAL_MODULES
        Core
        Gui
        Widgets
        PrintSupport
        Sql
        Network
        Test
        Concurrent)
endmacro()

macro(collect_optional_modules)
    # Collect all optional modules.
    set(ALL_OPTIONAL_MODULES
        DBus
        Designer
    …[truncated]
Fable
thinking
I'm confirming the Qt module dependencies—QtCore, QtGui, QtWidgets, and QtPrintSupport are essential, with QtUiTools as optional. QtUiTools only depends on QtWidgets, and QtPrintSupport depends on QtWidgets too, so the dependency chain is clean. Now I'm ready to set up the directory structure and start writing the build plan.
Fable
I now have a thorough, verified picture. Let me write the plan and supporting files.
Fable
⚙ Bash {"command": "mkdir -p /home/magik6k/lcad-wasm/porting/pyside-recipe; echo created", "description": "Create output dir"}
tool result
created
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/pyside-recipe/emscripten-pyside.toolchain.cmake", "content": "# emscripten-pyside.toolchain.cmake\n# Toolchain file used to CROSS-COMPILE libshiboken + libpyside + the QtCore/\n# QtGui/QtWidget…
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/pyside-recipe/emscripten-pyside.toolchain.cmake (file state is current in your context — no need to Read it back)
Fable
thinking
I'm going to write out the main build script and establish the overall plan for the build driver.
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/pyside-recipe/build-pyside-wasm.sh", "content": "#!/usr/bin/env bash\n# =============================================================================\n# build-pyside-wasm.sh\n# Build shiboken…
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/pyside-recipe/build-pyside-wasm.sh (file state is current in your context — no need to Read it back)
Fable
thinking
Looking at the existing WasmInittabGui.cpp implementation to understand how to write an accurate patch for it, then I'll work through the FreeCAD integration files and finalize the main plan.
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"=== WasmInittabGui.cpp ===\"; cat src/Main/WasmInittabGui.cpp 2>/dev/null | head -80; echo \"=== find inittab files ===\"; ls src/Main/WasmInittab*.cpp 2>/dev/null; grep -…
tool result
=== WasmInittabGui.cpp ===
=== find inittab files ===
src/Main/MainGui.cpp:156:void freecadWasmRegisterInittab();
src/Main/MainGui.cpp:199:    freecadWasmRegisterInittab();
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; echo \"=== find generated inittab ===\"; find . -name \"WasmInittab*.cpp\" 2>/dev/null; find /opt/toolchains/src/freecad-gui-build -name \"WasmInittab*\" 2>/dev/null; echo \"=== …
tool result
=== find generated inittab ===
/opt/toolchains/src/freecad-gui-build/src/Main/WasmInittabGui.cpp
/opt/toolchains/src/freecad-gui-build/src/Main/WasmInittab.cpp
/opt/toolchains/src/freecad-gui-build/src/Main/CMakeFiles/FreeCADMain.dir/WasmInittabGui.cpp.o
=== how generated ===
CMakeLists.txt:95:    # registered via PyImport_AppendInittab (see src/Main wasm inittab).
src/Main/CMakeLists.txt:49:            string(APPEND _regs "    PyImport_AppendInittab(\"${_mod}\", PyInit_${_mod});\n")
src/Main/CM  …[truncated]
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; sed -n '1,130p' src/Main/CMakeLists.txt", "description": "Read inittab generation CMake"}
tool result
# SPDX-License-Identifier: LGPL-2.1-or-later

configure_file(freecad.rc.cmake ${CMAKE_CURRENT_BINARY_DIR}/freecad.rc)
configure_file(freecadCmd.rc.cmake ${CMAKE_CURRENT_BINARY_DIR}/freecadCmd.rc)
file(COPY icon.ico DESTINATION ${CMAKE_CURRENT_BINARY_DIR})


if(EMSCRIPTEN)
    # Python extension modules are linked statically into the executables and
    # must be registered on the interpreter's inittab before Py_Initialize().
    set(FREECAD_WASM_PY_MODULES "")
    set(FREECAD_WASM_PY_GUI_MODULES  …[truncated]
Fable
thinking
I'm seeing how FreeCAD's inittab generator handles module registration, particularly with PySide's dotted module names—it registers the full path like "PySide6.QtCore" but maps it to the PyInit function of just the last component, like PyInit_QtCore.

Now I need to extend the inittab generation to include these PySide entries with their corresponding PyInit functions, then write out the comprehensive plan and patch files.
Fable
Now I'll write the comprehensive plan and remaining patch files.
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/pyside-recipe/0001-freecad-inittab-pyside.patch", "content": "--- a/src/Main/CMakeLists.txt\n+++ b/src/Main/CMakeLists.txt\n@@ -58,6 +58,34 @@ if(EMSCRIPTEN)\n \"}\\n\")\n endfu…
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/pyside-recipe/0001-freecad-inittab-pyside.patch (file state is current in your context — no need to Read it back)
Fable
⚙ Bash {"command": "cd /home/magik6k/lcad-wasm/freecad-port/FreeCAD; sed -n '190,210p' src/Main/MainGui.cpp", "description": "Read MainGui inittab call site"}
tool result
        return 2;
    }
}
#endif

int main(int argc, char** argv)
{
#ifdef __EMSCRIPTEN__
    qInstallMessageHandler(freecadWasmEarlyMessageHandler);
    freecadWasmRegisterInittab();
#endif
#if defined(FC_OS_LINUX) || defined(FC_OS_BSD)
    setlocale(LC_ALL, "");  // use native environment settings
    // Preserve the resolved numeric locale before forcing LC_NUMERIC=C for XML parsing.
    if (const char* localeName = setlocale(LC_NUMERIC, nullptr)) {
        Base::Tools::setOper  …[truncated]
Fable
thinking
Now I'm adding the PySide initialization call to MainGui.cpp and updating the CMakeLists linking configuration, then moving on to document the overall plan in plan.md.
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/pyside-recipe/0002-freecad-maingui-register.patch", "content": "--- a/src/Main/MainGui.cpp\n+++ b/src/Main/MainGui.cpp\n@@ -153,6 +153,7 @@\n #ifdef __EMSCRIPTEN__\n void freecadWasmRegisterIni…
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/pyside-recipe/0002-freecad-maingui-register.patch (file state is current in your context — no need to Read it back)
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/pyside-recipe/0003-freecad-gui-cmake-link.patch", "content": "# Snippet to splice into src/Gui/CMakeLists.txt, guarded by FREECAD_USE_PYSIDE.\n# Adds the wasm-static PySide/shiboken archives + …
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/pyside-recipe/0003-freecad-gui-cmake-link.patch (file state is current in your context — no need to Read it back)
Fable
thinking
Now I'm working on the main plan.md file as the core deliverable, and I need to add a patch note for converting libshiboken, libpyside, and module from shared to static libraries since BUILD_SHARED_LIBS might not fully work with explicit SHARED/MODULE declarations in add_library calls.
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/pyside-recipe/0004-pyside-static-targets.patch", "content": "# PySide/shiboken hard-code `add_library(... SHARED)` and `add_library(... MODULE)`,\n# so BUILD_SHARED_LIBS=OFF alone does NOT make…
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/pyside-recipe/0004-pyside-static-targets.patch (file state is current in your context — no need to Read it back)
Fable
Now the main plan.md:
Fable
⚙ Write {"file_path": "/home/magik6k/lcad-wasm/porting/pyside-recipe/plan.md", "content": "# Build PySide6 + shiboken6 for the FreeCAD wasm toolchain\n\nSlug: `pyside-recipe`\nTarget: link `shiboken6` + `PySide6` (QtCore/QtGui/QtWidgets/QtPrintSupp…
tool result
File created successfully at: /home/magik6k/lcad-wasm/porting/pyside-recipe/plan.md (file state is current in your context — no need to Read it back)
Fable
⚙ Bash {"command": "chmod +x /home/magik6k/lcad-wasm/porting/pyside-recipe/build-pyside-wasm.sh; ls -la /home/magik6k/lcad-wasm/porting/pyside-recipe/", "description": "chmod and list deliverables"}
tool result
total 52
drwxr-xr-x 1 agent agent   386 Jul  5 11:12 .
drwxr-xr-x 1 agent agent   370 Jul  5 11:10 ..
-rw-r--r-- 1 agent agent  2325 Jul  5 11:08 0001-freecad-inittab-pyside.patch
-rw-r--r-- 1 agent agent   501 Jul  5 11:08 0002-freecad-maingui-register.patch
-rw-r--r-- 1 agent agent  1657 Jul  5 11:09 0003-freecad-gui-cmake-link.patch
-rw-r--r-- 1 agent agent  3105 Jul  5 11:09 0004-pyside-static-targets.patch
-rwxr-xr-x 1 agent agent  7273 Jul  5 11:08 build-pyside-wasm.sh
-rw-r--r-- 1 agent a  …[truncated]
Fable
All deliverables written. Returning the structured summary.
Fable
⚙ StructuredOutput {"structuredOutput": "{\"slug\": \"pyside-recipe\", \"title\": \"Build PySide6 + shiboken6 static for the FreeCAD wasm toolchain\", \"feasibility\": \"needs-code\", \"oneLineVerdict\": \"Buildable with on-box tools but bespoke: PySide has n…
tool result
Output does not match required schema: root: must have required property 'slug', root: must have required property 'title', root: must have required property 'feasibility', root: must have required property 'oneLineVerdict', root: must have required property 'effort', root: must have required property 'buildOrder', root: must have required property 'deliverableFile', root: must NOT have additional properties
Fable
thinking
I need to restructure the output so the fields sit at the root level instead of being nested under "structuredOutput".
Fable
⚙ StructuredOutput {"slug": "pyside-recipe", "title": "Build PySide6 + shiboken6 static for the FreeCAD wasm toolchain", "feasibility": "needs-code", "oneLineVerdict": "Buildable with on-box tools but bespoke: PySide has no upstream wasm path, so drive raw CM…
tool result
Structured output provided successfully