revert but enable STABLE_ABI in nanobind_add_module

Author: alecjacobson

.github/workflows/wheels.yml

@@ -29,7 +29,7 @@ jobs:
       matrix:
         os: [ubuntu-24.04, ubuntu-24.04-arm, macos-14, macos-13, windows-latest]  # Use specific versions for clarity
         arch: [x86_64, arm64]
-        pybuilds: [cp313] # Define pybuilds at the top level
+        pybuilds: [cp312] # Define pybuilds at the top level
         exclude:
           - os: ubuntu-24.04-arm  # No need to specify arch, it's already implicit
             arch: x86_64  # Exclude x86_64 on ARM
@@ -46,7 +46,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
-          python-version: '3.13'
+          python-version: '3.12'
       - run: pip install cibuildwheel==2.23.0
       - run: python -m cibuildwheel --output-dir wheelhouse
         env:

CMakeLists.txt

@@ -14,13 +14,9 @@ set(CMAKE_OSX_DEPLOYMENT_TARGET "10.15")
 # <20 for embree
 set(CMAKE_CXX_STANDARD 17)
 
-if (CMAKE_VERSION VERSION_LESS 3.18)
-  set(DEV_MODULE Development)
-else()
-  set(DEV_MODULE Development.Module)
-endif()
-
-find_package(Python 3.8 COMPONENTS Interpreter ${DEV_MODULE} REQUIRED)
+find_package(Python 3.8
+  REQUIRED COMPONENTS Interpreter Development.Module
+  OPTIONAL_COMPONENTS Development.SABIModule)
 
 if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
   set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build." FORCE)
@@ -125,7 +121,10 @@ function(pyigl_include prefix name)
     file(WRITE "${generated_dir}/BINDING_INVOCATIONS.in" "${BINDING_INVOCATIONS}")
 
     set(target_name "pyigl${prefix_lc}_${name}")
-    nanobind_add_module(${target_name} ${sources})
+    nanobind_add_module(
+      ${target_name} 
+      STABLE_ABI
+      ${sources})
 
     # important for scikit-build
     install(TARGETS ${target_name} LIBRARY DESTINATION  "igl/${subpath}")

pyproject.toml

@@ -39,8 +39,8 @@ minimum-version = "build-system.requires"
 # Setuptools-style build caching in a local directory
 build-dir = "build/{wheel_tag}"
 
-# Build stable ABI wheels for CPython 3.13+
-wheel.py-api = "cp313"
+# Build stable ABI wheels for CPython 3.12+
+wheel.py-api = "cp312"
 
 
 [tool.scikit-build.cmake]