Fix CI wheels: STABLE_ABI conditional, ADTW param order, macOS deployment target

- python/CMakeLists.txt: STABLE_ABI only for Python >= 3.12 (was failing
  unconditionally on cp39/cp310/cp311)
- _dtwcpp_core.cpp: fix adtwBanded call — pass (x, y, band, penalty) not
  (x, y, penalty, band) to match the C++ signature after ADTW revert
- python-wheels.yml: set MACOSX_DEPLOYMENT_TARGET=10.15 for std::filesystem

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ElektrikAkar

.github/workflows/python-wheels.yml

@@ -22,19 +22,21 @@ jobs:
 
       - uses: pypa/cibuildwheel@v2.21
         env:
-          # Build for Python 3.9-3.13; nanobind STABLE_ABI means fewer wheels
+          # Build for Python 3.9-3.13
+          # STABLE_ABI (Python >= 3.12) handled conditionally in python/CMakeLists.txt
           CIBW_BUILD: "cp39-* cp310-* cp311-* cp312-* cp313-*"
           CIBW_SKIP: "*-musllinux_* *-win32 *-manylinux_i686"
           CIBW_ARCHS_MACOS: "x86_64 arm64"
 
           # Disable commercial/heavy solvers for wheel builds.
-          # Each cmake arg must be a separate config-setting line for scikit-build-core.
           CIBW_CONFIG_SETTINGS: >-
             cmake.args=-DDTWC_BUILD_PYTHON=ON
             cmake.args=-DDTWC_ENABLE_GUROBI=OFF
             cmake.args=-DDTWC_ENABLE_HIGHS=OFF
 
-          # macOS needs libomp for OpenMP
+          # macOS: require 10.15+ for std::filesystem, provide OpenMP hints
+          CIBW_ENVIRONMENT_MACOS: >-
+            MACOSX_DEPLOYMENT_TARGET=10.15
           CIBW_BEFORE_BUILD_MACOS: "brew install libomp || true"
 
           # Test the built wheel

python/CMakeLists.txt

@@ -1,9 +1,11 @@
 cmake_minimum_required(VERSION 3.21)
 
-nanobind_add_module(_dtwcpp_core
-  STABLE_ABI
-  src/_dtwcpp_core.cpp
-)
+# STABLE_ABI requires Python >= 3.12
+if(Python_VERSION VERSION_GREATER_EQUAL "3.12")
+  nanobind_add_module(_dtwcpp_core STABLE_ABI src/_dtwcpp_core.cpp)
+else()
+  nanobind_add_module(_dtwcpp_core src/_dtwcpp_core.cpp)
+endif()
 
 target_link_libraries(_dtwcpp_core PRIVATE dtwc++)
 

python/src/_dtwcpp_core.cpp

@@ -152,7 +152,7 @@ NB_MODULE(_dtwcpp_core, m) {
                               const std::vector<double> &y,
                               int band, double penalty) {
     nb::gil_scoped_release release;
-    return dtwc::adtwBanded<double>(x, y, penalty, band);
+    return dtwc::adtwBanded<double>(x, y, band, penalty);
   }, "x"_a, "y"_a, "band"_a = -1, "penalty"_a = 1.0,
      "Compute Amerced DTW distance with non-diagonal step penalty.");