subagent transcript

session 17f09f89 · workflow wf_4f35050d
← 17f09f89 · archive
delegated task
Rebuilding the FreeCAD-wasm PySide binding stack with NATIVE wasm exceptions (new-EH / try_table, -fwasm-exceptions -sWASM_LEGACY_EXCEPTIONS=0) to mat
▸ Magik
Rebuilding the FreeCAD-wasm PySide binding stack with NATIVE wasm exceptions (new-EH / try_table, -fwasm-exceptions -sWASM_LEGACY_EXCEPTIONS=0) to match the JSPI + wasm-EH toolchain (qt-jspi is try_table). Mixed EH => invalid module, so EVERY C++ archive must be new-EH with ZERO 'U invoke_' symbols. Env: source /opt/toolchains/emsdk/emsdk_env.sh AND export LD_LIBRARY_PATH=/home/magik6k/lcad-wasm/pyside-port/libshim (host shiboken6 needs the libclang shim). Working dir /home/magik6k/lcad-wasm/pyside-port. The build scripts there ALREADY have the new-EH flags applied. QtCore was already rebuilt new-EH (build/m2-qtcore/, validated). VERIFY each output archive: (a) it exists + has its PyInit symbol; (b) new-EH: emnm <archive> | grep -c 'U invoke_' MUST be 0 (invoke_ = JS-EH leftover = fail); (c) optional: extract one .o, link 'int main(){}' + the .o with 'em++ -fwasm-exceptions -sWASM_LEGACY_EXCEPTIONS=0 -sJSPI -sERROR_ON_UNDEFINED_SYMBOLS=0' and node -e 'WebAssembly.validate(...)' == true. Report the archive path, PyInit symbol presence, invoke_ count (must be 0), and pass/fail. BUILD pivy._coin new-EH. Run: cd /home/magik6k/lcad-wasm/pyside-port/build/pivy-coin && bash build.sh -> libpivy_coin_wasm.a (PyInit__coin). The script was updated to -fwasm-exceptions -sWASM_LEGACY_EXCEPTIONS=0. VERIFY 0 invoke_ (Coin symbols resolve at FreeCAD final link, that's fine — check only invoke_). Report.
Fable
thinking
I'll start by examining the build directory and the scripts there.
Fable
I'll start by examining the build setup and environment.
Fable
⚙ Bash {"command": "cat /home/magik6k/lcad-wasm/pyside-port/build/pivy-coin/build.sh 2>/dev/null | head -100; echo \"---ENV---\"; ls /opt/toolchains/emsdk/emsdk_env.sh; echo \"---DIR---\"; ls -la /home/magik6k/lcad-wasm/pyside-port/build/pivy-coin…
tool result
#!/usr/bin/env bash
# Reproducible build of pivy._coin as a wasm static archive.
# Coin3D is in-tree and already statically linked into FreeCAD.wasm, so this
# archive only needs to COMPILE (define PyInit__coin); Coin + CPython symbols
# resolve at FreeCAD's final link.
set -euo pipefail
source /home/magik6k/lcad-wasm/env.sh 2>/dev/null || true

PIVY_ROOT=/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/pivy
INTERFACES=$PIVY_ROOT/interfaces
COIN_SRC_INC=/home/magik6k/lcad-wasm/freecad-p  …[truncated]
Fable
The script has the new-EH flags. Now let me run the build.
Fable
⚙ Bash {"command": "source /opt/toolchains/emsdk/emsdk_env.sh >/dev/null 2>&1; export LD_LIBRARY_PATH=/home/magik6k/lcad-wasm/pyside-port/libshim; cd /home/magik6k/lcad-wasm/pyside-port/build/pivy-coin && bash build.sh 2>&1 | tail -30", "descripti…
tool result
LLVM ERROR: IO failure on output stream: Broken pipe
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
The broken pipe error might be coming from the tail command cutting off the output mid-stream. I should redirect the full output to a log file instead of piping through tail to see the complete error message.
Fable
The pipe to tail caused a broken pipe. Let me run redirecting to a log file.
Fable
⚙ Bash {"command": "source /opt/toolchains/emsdk/emsdk_env.sh >/dev/null 2>&1; export LD_LIBRARY_PATH=/home/magik6k/lcad-wasm/pyside-port/libshim; cd /home/magik6k/lcad-wasm/pyside-port/build/pivy-coin && bash build.sh > /tmp/claude-1000/-home-mag…
tool result
EXIT=1
LLVM ERROR: IO failure on output stream: Broken pipe
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
I'm seeing an LLVM compilation error with an IO failure and broken pipe, so I need to check the full build log to understand what's happening during the compile step.
Fable
⚙ Bash {"command": "cat /tmp/claude-1000/-home-magik6k-lcad-wasm/17f09f89-ce7c-4f49-aa6a-cf0521026805/scratchpad/build.log", "description": "Show full build log"}
tool result
LLVM ERROR: IO failure on output stream: Broken pipe
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
The build pipeline ran through swig, em++, and emar steps, but I'm getting a broken pipe error that's likely coming from the em++ stage. Let me check if the intermediate .o files were actually regenerated, or I should run each step individually to pinpoint where it's failing.
Fable
⚙ Bash {"command": "source /opt/toolchains/emsdk/emsdk_env.sh >/dev/null 2>&1; export LD_LIBRARY_PATH=/home/magik6k/lcad-wasm/pyside-port/libshim; cd /home/magik6k/lcad-wasm/pyside-port/build/pivy-coin && bash -x build.sh > /tmp/claude-1000/-home-…
tool result
EXIT=1
===TAIL===
+ set -euo pipefail
+ source /home/magik6k/lcad-wasm/env.sh
+ PIVY_ROOT=/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/pivy
+ INTERFACES=/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/pivy/interfaces
+ COIN_SRC_INC=/home/magik6k/lcad-wasm/freecad-port/FreeCAD/src/3rdParty/coin/include
+ COIN_GEN_INC=/opt/toolchains/src/freecad-gui-build/src/3rdParty/coin/include
+ PYINC=/opt/toolchains/python-wasm/include/python3.14
+ OUT=/home/magik6k/lcad-wasm/pyside-por  …[truncated]
Fable
thinking
The build actually succeeded—the LLVM error was just a side effect of `grep -q` closing the pipe early after finding its match, which caused `llvm-nm` to receive a broken pipe signal. The archive was built fine and the em++ compilation completed successfully. Now I need to verify the PyInit symbol properly.

Let me run `emnm` without the `-q` flag and save the output to a file instead, so I can check for the symbol without prematurely closing the pipe.
Fable
The build actually completed all steps. The exit 1 is just `grep -q` closing the pipe early (llvm-nm gets SIGPIPE). Let me verify the archive properly.
Fable
⚙ Bash {"command": "source /opt/toolchains/emsdk/emsdk_env.sh >/dev/null 2>&1; cd /home/magik6k/lcad-wasm/pyside-port/build/pivy-coin; ls -la libpivy_coin_wasm.a; echo \"===nm dump===\"; emnm libpivy_coin_wasm.a > /tmp/claude-1000/-home-magik6k-lc…
tool result
-rw-r--r-- 1 magik6k magik6k 14964754 Jul  6 02:06 libpivy_coin_wasm.a
===nm dump===
nm exit via file, lines=72190
=== PyInit ===
00001786 T PyInit__coin
00001660 d _ZZ12PyInit__coinE11SWIG_module
00001650 d _ZZ12PyInit__coinE9SwigSlots
=== invoke_ count ===
0
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
thinking
The archive was freshly rebuilt with PyInit__coin defined and the invoke count at zero. Now I'm extracting the coin_wrap object file and linking it with a main function, keeping undefined coin symbols allowed since ERROR_ON_UNDEFINED_SYMBOLS is disabled.

Now I'm running the validation.
Fable
Fresh rebuild (02:06), PyInit__coin defined (T), invoke_ count = 0. Let me run the optional link+validate check.
Fable
⚙ Bash {"command": "source /opt/toolchains/emsdk/emsdk_env.sh >/dev/null 2>&1; cd /tmp/claude-1000/-home-magik6k-lcad-wasm/17f09f89-ce7c-4f49-aa6a-cf0521026805/scratchpad; printf 'int main(){}\\n' > m.c; A=/home/magik6k/lcad-wasm/pyside-port/build…
tool result
LINK EXIT=0
clang++: warning: treating 'c' input as 'c++' when in C++ mode, this behavior is deprecated [-Wdeprecated]
em++: warning: -sASYNCIFY=2 (JSPI) is still experimental [-Wexperimental]
VALIDATE: true
zshexit:1: parameter HISTDB_FD does not contain a file descriptor
Fable
All checks pass. Reporting.
Fable
⚙ StructuredOutput {"component": "pivy._coin", "ok": true, "invokeCount": 0, "archivePath": "/home/magik6k/lcad-wasm/pyside-port/build/pivy-coin/libpivy_coin_wasm.a", "pyinitPresent": true, "validated": true, "notes": "Built via `cd /home/magik6k/lcad-wasm/py…
tool result
Structured output provided successfully