Archive debugging code related to python/cpython#103912 (comment)

pybind11/cpython-gh-103912/build.sh

@@ -0,0 +1,12 @@
+#! /usr/bin/bash
+if [ "$1" == "last_good" ]; then
+  PYINST=segfault_20230520_last_good
+elif [ "$1" == "first_bad" ]; then
+  PYINST=segfault_20230520_first_bad
+else
+  echo "Invalid argument: '$1'"
+  exit 1
+fi
+set -x
+g++ -o main_debugging.o -c -std=c++17 -O0 -g -Wall -Wextra -Wconversion -Wcast-qual -Wdeprecated -Wundef -Wnon-virtual-dtor -Wunused-result -Werror -I/usr/local/google/home/rwgk/forked/pybind11/include -I/usr/local/google/home/rwgk/usr_local_like/$PYINST/include/python3.12 main_debugging.cpp
+g++ -o main_debugging -L/usr/local/google/home/rwgk/usr_local_like/$PYINST/lib -rdynamic -O0 -g main_debugging.o -lpython3.12 -lpthread -ldl -lutil

pybind11/cpython-gh-103912/main_debugging.cpp

@@ -0,0 +1,26 @@
+// https://github.com/python/cpython/pull/103912#issuecomment-1559558193
+
+#include <pybind11/embed.h>
+#include <pybind11/pybind11.h>
+
+namespace py = pybind11;
+
+PYBIND11_EMBEDDED_MODULE(mi_debugging, m) {
+    struct Base1 {};
+    struct Base2 {};
+    struct Base12 : Base1, Base2 {};
+
+    py::class_<Base1> b1(m, "Base1");
+    py::class_<Base2> b2(m, "Base2");
+    py::class_<Base12, Base1, Base2>(m, "Base12");
+}
+
+int main() {
+    py::initialize_interpreter();
+
+    py::module_::import("mi_debugging");
+
+    py::finalize_interpreter();
+
+    return 0;
+}