subagent transcript

session 17f09f89 · workflow wf_b0622fdd
delegated task
CONTEXT — porting PySide6 6.11 QtCore bindings to WebAssembly (emscripten 4.0.12, static, no-dlopen, ASYNCIFY, JS-exceptions) for a FreeCAD-wasm build
▸ Magik
CONTEXT — porting PySide6 6.11 QtCore bindings to WebAssembly (emscripten 4.0.12, static, no-dlopen, ASYNCIFY, JS-exceptions) for a FreeCAD-wasm build. Toolchain: run `source /opt/toolchains/emsdk/emsdk_env.sh` first, then use emcc/emar/emnm (emscripten's llvm-nm) / emcc -c. Paths: - PySide6 source: /tmp/pyside-setup/sources/pyside6 (PySide6 module dir: .../PySide6). shiboken6 source: /tmp/pyside-setup/sources/shiboken6 - Generated QtCore wrappers (already produced): /home/magik6k/lcad-wasm/pyside-port/build/m2-qtcore/gen/PySide6/QtCore/*.cpp (module header: pyside6_qtcore_python.h) - Built archive under test: /home/magik6k/lcad-wasm/pyside-port/build/m2-qtcore/libQtCore_wasm.a - Build script that produced it: /home/magik6k/lcad-wasm/pyside-port/m2-qtcore/build.sh (IMPORTANT: it compiles ONLY the generated wrapper *.cpp into the archive; it compiles NONE of the glue TUs. It excludes files matching *numpy*.) - Sibling archives present at final link: libpyside_wasm.a (pyside-port/build/libpyside/), libShiboken_wasm.a (pyside-port/build/shiboken-mod/), libshiboken_wasm.a (pyside-port/build/m0-minimal/) - Qt (asyncify wasm): /opt/toolchains/qt-asyncify/6.11.1/wasm_singlethread (static libs in lib/libQt6*.a, headers in include/). Built single-thread (QT_FEATURE_thread=-1). - Python wasm: /opt/toolchains/python-wasm (headers include/python3.14, static libs in lib/). CPython 3.14.4. - Host moc for glue that needs it: /opt/toolchains/qt/6.11.1/gcc_64/libexec/moc - shiboken generated-inc dir: /home/magik6k/lcad-wasm/pyside-port/build/shiboken-wasm-inc (has sbkversion.h, embed/*) KNOWN (but INCOMPLETE — wasm-ld stopped at "too many errors") undefined symbols when linking FreeCAD against libQtCore_wasm.a: - QtCoreHelper::QGenericArgumentHolder::* and QtCoreHelper::QGenericReturnArgumentHolder::* (ctor/dtor/data/metaType/toGenericReturnArgument/operator=) - PyTime_ImportAndCheck(_object*) - QLocale::qt_check_for_QGADGET_macro(), and same for QMimeType, QNativeIpcKey, QStandardPaths, QLocationPermission AUTHORITATIVE FACT: sources/pyside6/PySide6/QtCore/CMakeLists.txt compiles 4 glue translation units into the QtCore module that build.sh is currently MISSING: glue/qeasingcurve_glue.cpp, glue/core_snippets.cpp, glue/qtcorehelper.cpp, glue/qiopipe.cpp qiopipe.cpp contains Q_OBJECT and #include "qiopipe.moc" (needs moc). qt_check_for_QGADGET_macro is a Q_GADGET moc-marker method that is DECLARED but NEVER defined anywhere (confirmed: not in libQt6Core.a) — shiboken wrongly generated a Python binding that CALLS it. The build.sh compile flags for wrappers are: EMFLAGS="-fexceptions -O2 -DNDEBUG -std=c++17 -DSHIBOKEN_NO_EMBEDDING_PYC=1 -DAVOID_PROTECTED_HACK=1" INCS="-I<gen> -I<shiboken-wasm-inc> -I<inc>/embed -I<python3.14> -I<shiboken6/libshiboken> -I<pyside6/libpyside> -I<PySide6/QtCore> -I<PySide6> -I<qtinc> -I<qtinc/QtCore> -I<qtinc/QtCore/6.11.1> -I<qtinc/QtCore/6.11.1/QtCore> -I<qt/mkspecs/wasm-emscripten>" GOAL: produce the COMPLETE set of changes to build.sh so that ONE rebuild yields an archive that links into FreeCAD with ZERO undefined symbols. Be concrete and evidence-based: cite file:line, and RUN emnm/emcc/grep to verify claims. Do not speculate — compile things and check. YOUR DIMENSION — do the 4 glue TUs themselves compile AND link cleanly? For each of glue/qeasingcurve_glue.cpp, glue/core_snippets.cpp, glue/qtcorehelper.cpp, glue/qiopipe.cpp: 1. Determine the exact include set + moc needs (qiopipe needs `moc qiopipe.cpp -o qiopipe.moc` in its dir; it includes <QtCore/private/qobject_p.h> so needs Qt private include paths). 2. Actually compile each for wasm (emcc -c) in /tmp/glueprobe-C. Capture compile errors verbatim. 3. For each that compiles, emnm the .o and list undefined symbols it introduces that are NOT satisfied by Qt/python/pyside/shiboken (e.g. references into pyside numpy, other glue, private Qt symbols absent in the single-thread asyncify Qt). Return exact, working emcc/moc command lines as bashSnippet, plus any NEW missing deps as risks/remainingUndefinedSymbols. This must ensure adding the glue doesn't just move the link failure.
Fable
thinking
I'm setting up to compile the four glue translation units for WebAssembly and then check for any undefined symbols. Let me start by exploring the relevant paths and getting the environment ready.
Fable
I'll start by exploring the glue files and setting up the environment.
Fable
⚙ Bash {"command": "source /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null; ls -la /tmp/pyside-setup/sources/pyside6/PySide6/QtCore/glue/ 2>&1; echo \"---CMAKE---\"; grep -n \"glue/\" /tmp/pyside-setup/sources/pyside6/PySide6/QtCore/CMakeLists.txt …
tool result
total 40
drwx------ 1 magik6k magik6k   202 Jul  5 11:02 .
drwx------ 1 magik6k magik6k   218 Jul  5 11:02 ..
-rw------- 1 magik6k magik6k 10033 Jul  5 11:02 core_snippets.cpp
-rw------- 1 magik6k magik6k  4472 Jul  5 11:02 core_snippets_p.h
-rw------- 1 magik6k magik6k  3282 Jul  5 11:02 qeasingcurve_glue.cpp
-rw------- 1 magik6k magik6k   876 Jul  5 11:02 qeasingcurve_glue.h
-rw------- 1 magik6k magik6k  3230 Jul  5 11:02 qiopipe.cpp
-rw------- 1 magik6k magik6k  51  …[truncated]
Fable
⚙ Bash {"command": "cat /home/magik6k/lcad-wasm/pyside-port/m2-qtcore/build.sh 2>&1", "description": "Read build.sh"}
tool result
#!/usr/bin/env bash
# M2: FULL QtCore (QObject + signals + all core value types) binding for wasm.
# Produces libQtCore_wasm.a exporting PyInit_QtCore, linked against the asyncify
# Qt headers + libpyside (signals) + shiboken runtime.
set -euo pipefail
source /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null

GEN=/opt/toolchains/pyside-host/bin/shiboken6
SHIB=/tmp/pyside-setup/sources/shiboken6
PS=/tmp/pyside-setup/sources/pyside6
PSDIR=$PS/PySide6
LIBPYSIDE=$PS/libpyside
INC=/home/magik6k/lcad-was  …[truncated]
Fable
thinking
I'm going to examine the glue source files and their dependencies, then set up the probe directory.
Fable
Let me read the glue files to understand their includes and moc needs.
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup/sources/pyside6/PySide6/QtCore/glue; echo \"=== qeasingcurve_glue.cpp includes ===\"; grep -n \"#include\" qeasingcurve_glue.cpp; echo; echo \"=== core_snippets.cpp includes ===\"; grep -n \"#include\" core…
tool result
=== qeasingcurve_glue.cpp includes ===
5:#include <sbkpython.h>
6:#include <gilstate.h>
7:#include <sbkconverter.h>
8:#include <sbkstaticstrings.h>
9:#include <pysideweakref.h>
11:#include <QtCore/QEasingCurve>
13:#include "glue/qeasingcurve_glue.h"

=== core_snippets.cpp includes ===
5:#include "core_snippets_p.h"
6:#include "qtcorehelper.h"
7:#include "pysideqobject.h"
9:#include "sbkpython.h"
10:#include "sbkconverter.h"
11:#include "sbkpep.h"
15:#include "basewrapper.h"
16:#include "autodecr  …[truncated]
Fable
thinking
I need to track down where these header files are located — `qtcorehelper.h` and `qiopipe.h` should be in the PySide6/QtCore directory or generated somewhere, and I'm trying to figure out why `core_snippets.cpp` is including them with just the bare filename.
Fable
Let me locate the referenced headers (qtcorehelper.h, qiopipe.h) and Qt private includes.
Fable
⚙ Bash {"command": "cd /tmp/pyside-setup/sources/pyside6; echo \"=== find qtcorehelper.h ===\"; find . -name \"qtcorehelper.h\" 2>/dev/null; echo \"=== find qiopipe.h ===\"; find . -name \"qiopipe.h\" 2>/dev/null; echo \"=== find pysidemacros.h ==…
tool result
=== find qtcorehelper.h ===
./PySide6/qtcorehelper.h
=== find qiopipe.h ===
./PySide6/qiopipe.h
=== find pysidemacros.h ===
./libpyside/pysidemacros.h
=== Qt private qobject_p.h ===
/opt/toolchains/qt-asyncify/6.11.1/wasm_singlethread/include/QtCore/6.11.1/QtCore/private/qobject_p.h
=== Qt private dir exists? ===
/opt/toolchains/qt-asyncify/6.11.1/wasm_singlethread/include/QtCore/6.11.1/QtCore/private
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
The include paths are already set up correctly — qtcorehelper.h and qiopipe.h are in the PySide6 directory which is covered by the existing `-I$PSDIR` flag, and the Qt private headers resolve through the QtCore path that's already in QTFLAGS. Now I need to configure the next part of the build.
Fable
Now let me set up the probe directory and compile all 4 glue TUs with the build.sh flags.
Fable
⚙ Bash {"command": "source /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null\nset -e\nSHIB=/tmp/pyside-setup/sources/shiboken6\nPS=/tmp/pyside-setup/sources/pyside6\nPSDIR=$PS/PySide6\nLIBPYSIDE=$PS/libpyside\nINC=/home/magik6k/lcad-wasm/pyside-port/…
tool result
GD exists? 
/home/magik6k/lcad-wasm/pyside-port/build/m2-qtcore/gen/PySide6/QtCore
pyside6_qtcore_python.h?
/home/magik6k/lcad-wasm/pyside-port/build/m2-qtcore/gen/PySide6/QtCore/pyside6_qtcore_python.h
=== COMPILE qeasingcurve_glue.cpp ===
FAIL qeasingcurve
clang: error: unknown argument: '-fexceptions -O2 -DNDEBUG -std=c++17 -DSHIBOKEN_NO_EMBEDDING_PYC=1 -DAVOID_PROTECTED_HACK=1'
=== COMPILE qtcorehelper.cpp ===
FAIL qtcorehelper
clang: error: unknown argument: '-fexceptions -O  …[truncated]
Fable
thinking
I see the issue now — the quoting is causing EMFLAGS to be treated as a single argument instead of being split. Since this is running in zsh, variables don't word-split by default like they would in bash, so I need to either explicitly invoke bash or adjust the shell options to enable word splitting.
Fable
zsh doesn't word-split unquoted variables. Let me run via bash.
Fable
⚙ Bash {"command": "bash -c '\nsource /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null\nSHIB=/tmp/pyside-setup/sources/shiboken6\nPS=/tmp/pyside-setup/sources/pyside6\nPSDIR=$PS/PySide6\nLIBPYSIDE=$PS/libpyside\nINC=/home/magik6k/lcad-wasm/pyside-po…
tool result
=== COMPILE qeasingcurve_glue.cpp ===
OK qeasingcurve_glue
=== COMPILE qtcorehelper.cpp ===
OK qtcorehelper
=== COMPILE core_snippets.cpp ===
OK core_snippets
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
All 3 non-moc TUs compile. Now the moc one: qiopipe.cpp needs `moc qiopipe.cpp -o qiopipe.moc` in a dir where it can be included.
Fable
⚙ Bash {"command": "bash -c '\nsource /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null\nSHIB=/tmp/pyside-setup/sources/shiboken6\nPS=/tmp/pyside-setup/sources/pyside6\nPSDIR=$PS/PySide6\nLIBPYSIDE=$PS/libpyside\nINC=/home/magik6k/lcad-wasm/pyside-po…
tool result
=== MOC qiopipe ===
moc OK
-rw-r--r-- 1 magik6k magik6k 2974 Jul  5 18:02 /tmp/glueprobe-C/qiopipe.moc
=== COMPILE qiopipe.cpp (with -I$P so qiopipe.moc resolves) ===
OK qiopipe
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
Now I need to check what undefined symbols each compiled object introduces and verify they're satisfied by the available Qt, Python, PySide, and Shiboken libraries. Let me extract the undefined symbols from each object file and cross-reference them against what's available in the sibling archives and system libraries.
Fable
All 4 compile. Now let me extract undefined symbols from each .o and check them against the available archives.
Fable
⚙ Bash {"command": "bash -c '\nsource /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null\nP=/tmp/glueprobe-C\nfor o in qeasingcurve_glue qtcorehelper core_snippets qiopipe; do\n echo \"===== $o.o undefined symbols (demangled) =====\"\n emnm $P/$o.o …
tool result
===== qeasingcurve_glue.o undefined symbols (demangled) =====
         U __cxa_begin_catch
         U __cxa_find_matching_catch_2
         U __cxa_find_matching_catch_3
         U getTempRet0
         U __indirect_function_table
         U invoke_i
         U invoke_ii
         U invoke_iii
         U invoke_iiii
         U invoke_vi
         U invoke_viii
         U operator delete(void*, unsigned long)
         U operator new(unsigned long)
         U Py_BuildValue
         U _Py_Dealloc
       …[truncated]
Fable
thinking
I need to pull the full undefined symbols list from qiopipe since it was truncated, and I'm noticing something critical — core_snippets.o is referencing those exact QtCoreHelper symbols that are on my known missing list, which confirms these are the actual unresolved dependencies I need to address.
Fable
⚙ Bash {"command": "bash -c '\nsource /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null\nP=/tmp/glueprobe-C\necho \"===== qiopipe.o undefined symbols =====\"\nemnm $P/qiopipe.o | grep \" U \" | c++filt | sort -u\necho\necho \"===== qtcorehelper.o DEF…
tool result
===== qiopipe.o undefined symbols =====
         U __cxa_find_matching_catch_2
         U getTempRet0
         U __indirect_function_table
         U invoke_ii
         U operator delete(void*)
         U operator delete(void*, unsigned long)
         U operator new(unsigned long)
         U QArrayData::deallocate(QArrayData*, int, int)
         U QByteArray::mid(int, int) const &
         U QByteArray::reallocData(int, QArrayData::AllocationOption)
         U QByteArray::resize(int)
         U   …[truncated]
Fable
thinking
All four glue translation units compile successfully. The key insight is that qtcorehelper.o defines all the QtCoreHelper symbols that were previously missing, and core_snippets.o depends on them—so they satisfy each other's requirements. Now I need to identify which undefined symbols introduced by the glue layer aren't being resolved by Qt, Python, PySide, or Shiboken.

Most of the undefined symbols fall into expected categories: Emscripten runtime intrinsics, standard library functions, Python C API symbols, Shiboken/PySide internals, and Qt public APIs. The risky ones to verify are Qt private symbols that qiopipe references—particularly QObjectPrivate methods, QtSharedPointer internals, a  …
Fable
All 4 compile, and qtcorehelper.o defines exactly the QGenericArgumentHolder/QGenericReturnArgumentHolder symbols from the known-missing list. Now I must verify the riskiest undefined refs (Qt-private symbols in qiopipe, QDirListing in qtcorehelper, and pyside/shiboken refs) are actually provided by the available archives. Let me build a provider symbol index and resolve against it.
Fable
⚙ Bash {"command": "bash -c '\nsource /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null\nQT=/opt/toolchains/qt-asyncify/6.11.1/wasm_singlethread\nPYLIB=/opt/toolchains/python-wasm/lib\nPP=/home/magik6k/lcad-wasm/pyside-port/build\nP=/tmp/glueprobe-C\…
tool result
/opt/toolchains/python-wasm/lib/libpython3.14.a
/opt/toolchains/qt-asyncify/6.11.1/wasm_singlethread/lib/libQt6Core.a
--- pyside/shiboken sibling archives ---
/home/magik6k/lcad-wasm/pyside-port/build/libpyside/libpyside_wasm.a
/home/magik6k/lcad-wasm/pyside-port/build/m0-minimal/libshiboken_wasm.a
/home/magik6k/lcad-wasm/pyside-port/build/shiboken-mod/libShiboken_wasm.a
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
⚙ Bash {"command": "bash -c '\nsource /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null\nQT=/opt/toolchains/qt-asyncify/6.11.1/wasm_singlethread\nPYLIB=/opt/toolchains/python-wasm/lib\nPP=/home/magik6k/lcad-wasm/pyside-port/build\nP=/tmp/glueprobe-C\…
tool result
36489 /tmp/glueprobe-C/provider_syms.txt
===== UNRESOLVED (not in providers, not emscripten intrinsic) =====
--- qeasingcurve_glue.o UNRESOLVED: ---
operator delete(void*, unsigned long)
operator new(unsigned long)
std::terminate()
--- qtcorehelper.o UNRESOLVED: ---
operator delete(void*, unsigned long)
std::__2::__shared_weak_count::__get_deleter(std::type_info const&) const
std::__2::__shared_weak_count::__release_weak()
std::__2::__shared_weak_count::~__shared_weak_count()
operator new(unsign  …[truncated]
Fable
thinking
The unresolved symbols are all coming from the C++ standard library and compiler runtime—things like memory allocation operators, exception handling, and the shared pointer machinery that emscripten provides automatically during linking.

Now I'm looking at some additional unresolved symbols: `std::bad_function_call` and basic C functions like `strlen` and `strcmp` from libc. The tricky one is the vtable for `QtCoreHelper::QIOPipe`—it's generated by moc and should be emitted in the translation unit where the key virtual function is defined, but it's showing as undefined in qiopipe.o, which suggests either the key function isn't actually in that file or the vtable is being emitted as weak els  …
Fable
Only standard libc++/libc++abi/libc symbols are unresolved (operator new/delete, std::terminate, strlen, strcmp, shared_weak_count, bad_function_call, __si_class_type_info) — all provided automatically by emscripten's sysroot at final link. The one non-standard entry is `vtable for QtCoreHelper::QIOPipe`. Let me verify whether qiopipe.o itself emits it (key-function placement).
Fable
⚙ Bash {"command": "bash -c '\nsource /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null\nP=/tmp/glueprobe-C\necho \"=== QIOPipe symbols DEFINED in qiopipe.o ===\"\nemnm $P/qiopipe.o | c++filt | grep -i \"QIOPipe\" | grep -vE \"^[[:space:]]+U \"\necho…
tool result
=== QIOPipe symbols DEFINED in qiopipe.o ===
0000008d T QtCoreHelper::QIOPipePrivate::QIOPipePrivate()
0000008d T QtCoreHelper::QIOPipePrivate::QIOPipePrivate()
00000adf W QtCoreHelper::QIOPipePrivate::~QIOPipePrivate()
00000a7c W QtCoreHelper::QIOPipePrivate::~QIOPipePrivate()
000004b4 T QtCoreHelper::QIOPipe::open(QFlags<QIODeviceBase::OpenModeFlag>)
00000001 T QtCoreHelper::QIOPipe::QIOPipe(QObject*)
00000001 T QtCoreHelper::QIOPipe::QIOPipe(QObject*)
00000515 T QtCoreHelper::QIOPipe::end1()   …[truncated]
Fable
thinking
I'm looking at a linker issue with the vtable for QtCoreHelper::QIOPipe being undefined in qiopipe.o. Since QIOPipe is a Q_OBJECT class, Qt should emit its vtable either where the moc metaobject is generated or at the key function definition—the first non-inline virtual method. I need to check whether QIOPipe actually overrides any QIODevice virtuals, as that might be affecting where the vtable gets placed. The moc-generated qt_metacall should anchor the vtable in qiopipe.o, but if it's not being emitted there, the vtable would be undefined everywhere — yet this code compiles fine upstream. The key difference might be how the key function is determined or where the vtable gets emitted in the  …
Fable
`vtable for QIOPipe` is undefined in qiopipe.o while QIOPipePrivate's vtable is emitted. This is a key-function question. Let me read the full qiopipe.h/cpp to see QIOPipe's virtuals and whether the vtable anchors elsewhere.
Fable
⚙ Bash {"command": "cat -n /tmp/pyside-setup/sources/pyside6/PySide6/qiopipe.h; echo \"=====CPP=====\"; cat -n /tmp/pyside-setup/sources/pyside6/PySide6/QtCore/glue/qiopipe.cpp", "description": "Read qiopipe header and source"}
tool result
     1	// Copyright (C) 2024 The Qt Company Ltd.
     2	// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
     3	// Qt-Security score:significant reason:default
     4	
     5	#ifndef QIOPIPE_H
     6	#define QIOPIPE_H
     7	
     8	#include <QtCore/qiodevicebase.h>
     9	#include <QtCore/qobject.h>
    10	
    11	QT_BEGIN_NAMESPACE
    12	
    13	class QIODevice;
    14	
    15	namespace QtCoreHelper
    16	{
    17	
    18	class QIOPipePriv  …[truncated]
Fable
thinking
So QIOPipe inherits from QObject and uses Q_OBJECT, which generates the virtual metaobject functions through the moc system. The key insight is that the key function for a polymorphic class is the first non-inline, non-pure virtual function, and in QIOPipe's case those moc-generated virtuals like qt_metacall would be the ones determining the key function. Ah, that's the issue — QIOPipe's Q_OBJECT is declared in the header qiopipe.h, not in qiopipe.cpp, so it needs a separate moc run to generate moc_qiopipe.cpp. The vtable and metacall definitions come from that generated file, which isn't being compiled into the build. The CMake AUTOMOC feature would normally handle this by generating and co  …
Fable
Important finding: QIOPipe's `Q_OBJECT` is in the **header** qiopipe.h (line 21), but `#include "qiopipe.moc"` only pulls in moc output for Q_OBJECT classes **in qiopipe.cpp** (QPipeEndPoint). The header class QIOPipe needs a separate `moc_qiopipe.cpp`. Let me confirm what qiopipe.moc contains and that a header-moc provides `vtable for QIOPipe`.
Fable
⚙ Bash {"command": "bash -c '\nsource /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null\nPS=/tmp/pyside-setup/sources/pyside6\nPSDIR=$PS/PySide6\nQT=/opt/toolchains/qt-asyncify/6.11.1/wasm_singlethread\nQTINC=$QT/include\nQTFLAGS=\"-I$QTINC -I$QTINC/…
tool result
=== classes moc-processed in qiopipe.moc (from .cpp) ===
const QMetaObject QtCoreHelper::QPipeEndPoint::staticMetaObject

=== generate moc_qiopipe.cpp from HEADER qiopipe.h ===
moc header OK
--- QIOPipe metaobject in header moc? ---
QIOPipe::metaObject
QIOPipe::qt_metacall
QIOPipe::staticMetaObject

=== compile moc_qiopipe.cpp for wasm ===
compile OK
--- does moc_qiopipe.o DEFINE vtable for QIOPipe? ---
00000054 T QtCoreHelper::QIOPipe::qt_metacall(QMetaObject::Call, int, void**)
00000004 D QtCo  …[truncated]
Fable
thinking
So the issue is that `qiopipe.moc` only has the metaobject for `QPipeEndPoint`, but the `QIOPipe` class in the header needs its own generated `moc_qiopipe.cpp` file to define the vtable, static metaobject, and metacall functions. Without that separate moc file, the linker can't find the required symbols.

I'm verifying that `moc_qiopipe.o` itself doesn't introduce any new unresolved symbols, and checking that all the Qt-private symbols referenced in `qiopipe.o` (like `QObjectPrivate` constructor and related typeinfo) are actually present in `libQt6Core.a`. The unresolved list only showed standard library symbols plus the missing `QIOPipe` vtable, so the Qt internals are properly exported. No  …
Fable
Confirmed the gap: `qiopipe.moc` (from the .cpp) only contains QPipeEndPoint's metaobject. QIOPipe's metaobject/vtable requires a separate `moc_qiopipe.cpp` from the header. Let me verify moc_qiopipe.o introduces no new unresolved symbols, and re-confirm the full resolution with it added.
Fable
⚙ Bash {"command": "bash -c '\nsource /opt/toolchains/emsdk/emsdk_env.sh 2>/dev/null\nP=/tmp/glueprobe-C\nIDX=$P/provider_syms.txt\n# add moc_qiopipe defs to index\nemnm $P/moc_qiopipe.o 2>/dev/null | grep -vE \"^[[:space:]]+U \" | awk \"{print \\…
tool result
=== moc_qiopipe.o unresolved (non-std) ===
strcmp
operator delete(void*, unsigned long)
vtable for __cxxabiv1::__si_class_type_info

=== FINAL: qiopipe.o unresolved AFTER adding moc_qiopipe.o (non-std) ===
strcmp
operator delete(void*)
operator delete(void*, unsigned long)
operator new(unsigned long)
vtable for __cxxabiv1::__si_class_type_info
(only libc++/libc std symbols expected below, if any)
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
The remaining unresolved symbols are all standard library ones that emscripten's sysroot will handle automatically at link time—operator new/delete from libc++abi, strcmp and strlen from libc, and the __si_class_type_info vtable from libc++abi.

For the build script, I need to handle the glue compilation explicitly since those files live in a separate directory from the generated wrappers. The key issue is that qiopipe.cpp includes its own moc file, so I need to generate qiopipe.moc and make it available on the include path. More critically, I also need to moc the qiopipe.h header itself to generate moc_qiopipe.cpp, compile that, and add it to the archive—otherwise the vtable for QtCoreHelpe  …
Fable
All four glue TUs compile cleanly and, together with a header-moc, resolve fully. Here is my complete verified analysis. ## Summary of findings **All 4 glue TUs compile for wasm** with the existing `EMFLAGS`/`INCS` (no include additions needed — `qtcorehelper.h`/`qiopipe.h` live in `$PSDIR`, already on `-I$PSDIR`; Qt private `<QtCore/private/qobject_p.h>` resolves via `-I$QTINC/QtCore/6.11.1`, already in `QTFLAGS`). **qtcorehelper.o defines exactly the KNOWN-missing symbols** (`QtCoreHelper::QGenericArgumentHolder::*` and `QGenericReturnArgumentHolder::*` — ctor/dtor/data/metaType/toGenericArgument/toGenericReturnArgument/operator=), and core_snippets.o *references* them. So these two are mutually satisfying and both are required. **Critical new gap discovered — a SEPARATE header-moc is required.** `qiopipe.cpp:143` does `#include "qiopipe.moc"`, but that moc (run on the `.cpp`) only covers the Q_OBJECT class declared *in the .cpp* (`QPipeEndPoint`). The `QIOPipe` class has its `Q_OBJECT` in the **header** `qiopipe.h:19-21`. Verified: `qiopipe.moc` contains only `QtCoreHelper::QPipeEndPoint::staticMetaObject`. Consequently qiopipe.o leaves **`vtable for QtCoreHelper::QIOPipe` undefined** — a NEW link failure. This is fixed only by generating `moc_qiopipe.cpp` from `qiopipe.h` and compiling it in (verified it defines `vtable for QtCoreHelper::QIOPipe`, `QIOPipe::staticMetaObject`, `QIOPipe::qt_metacall`, `QIOPipe::metaObject`). **After adding the header-moc, every non-standard undefined symbol resolves** against libQt6Core.a (asyncify single-thread) + libpython3.14.a + the 3 pyside/shiboken archives + the glue objects themselves. Notably the risky ones are all present in the asyncify Qt: `QObjectPrivate::QObjectPrivate/~/writeToDebugStream/flagsForDumping`, `QObjectData::dynamicMetaObject`, `QtSharedPointer::ExternalRefCountData::getAndRef`, `typeinfo for QObjectPrivate`, and `QDirListing::begin/next` (Qt 6.8+ API). The only remaining unresolved symbols are standard libc++/libc++abi/libc (`operator new/delete`, `std::terminate`, `strlen/strcmp`, `__shared_weak_count`, `bad_function_call`, `__si_class_type_info` vtable) — all auto-linked from emscripten's sysroot at the FreeCAD final link. No references into pyside-numpy or any other glue module.
Fable
⚙ StructuredOutput {"__unparsedToolInput": {"raw": "{\"confidence\": \"high\", \"remainingUndefinedSymbols\": , \"requiredActions\": [\n {\n \"action\": \"Compile all 4 QtCore glue TUs into the archive (they are currently missing). Add a compile loop AFTE…
tool result
<tool_use_error>InputValidationError: StructuredOutput was called with input that could not be parsed as JSON.
You sent (first 200 of 4631 bytes): {"confidence": "high", "remainingUndefinedSymbols": , "requiredActions": [
  {
    "action": "Compile all 4 QtCore glue TUs into the archive (they are currently missing). Add a compile loop AFTER the 
Common causes: unescaped backslashes in file paths (use / or \\), unescaped control characters, or truncated output. Retry with valid JSON.</tool_use_er  …[truncated]
Fable
I had a JSON error (empty array value). Let me resubmit correctly.
Fable
⚙ StructuredOutput {"confidence": "high", "remainingUndefinedSymbols": ["operator new(unsigned long) [libc++abi sysroot]", "operator delete(void*) / operator delete(void*, unsigned long) [libc++abi sysroot]", "std::terminate() [libc++abi sysroot]", "vtable fo…
tool result
Structured output provided successfully