Add magic gdb

Author: adsharma

.github/workflows/ci.yml

@@ -126,7 +126,37 @@ jobs:
         env:
           LBUG_PYTHON_BACKEND: capi
         run: |
-          .venv/bin/python -m pytest -vv ./test
+          if ! command -v gdb >/dev/null 2>&1; then
+            sudo apt-get update
+            sudo apt-get install -y gdb
+          fi
+          echo "Relevant environment:"
+          env | sort | grep -Ei '^(http|https|all|no|ladybug|lbug|lang|lc_)' || true
+          echo "Resolved liblbug dependencies:"
+          ldd "$LBUG_C_API_LIB_PATH"
+
+          run_gdb() {
+            local log_file="$1"
+            shift
+            set +e
+            gdb --batch \
+              -ex "set pagination off" \
+              -ex "set print thread-events off" \
+              -ex "run" \
+              -ex "thread apply all bt full" \
+              --args "$@" 2>&1 | tee "$log_file"
+            local gdb_status=${PIPESTATUS[0]}
+            set -e
+            if grep -q "received signal SIGSEGV" "$log_file"; then
+              echo "gdb caught SIGSEGV" >&2
+              exit 1
+            fi
+            return "$gdb_status"
+          }
+
+          run_gdb .cache/gdb-json-install-smoke.log .venv/bin/python -c 'import shutil, tempfile; from pathlib import Path; import ladybug as lb; tmp = Path(tempfile.mkdtemp()); db = lb.Database(tmp / "db.lbdb"); conn = lb.Connection(db); conn.execute("INSTALL json; LOAD json;"); shutil.rmtree(tmp)'
+
+          run_gdb .cache/gdb-capi-pytest.log .venv/bin/python -m pytest -vv ./test
 
   python-ci-pybind:
     runs-on: ubuntu-latest