Python 3.13 Support, 3.8 EOL

Add support for Python 3.13.
Remove 3.8 because it is EOL as of Oct 2024.

Bump to pybind11 2.13.0+, which add Python 3.13 support in CI.

CMakeLists.txt

@@ -265,7 +265,7 @@ if(ImpactX_PYTHON)
             impactx_enable_IPO(pyImpactX)
         else()
             # conditionally defined target in pybind11
-            # https://github.com/pybind/pybind11/blob/v2.12.0/tools/pybind11Common.cmake#L397-L403
+            # https://github.com/pybind/pybind11/blob/v2.13.0/tools/pybind11Common.cmake#L407-L413
             target_link_libraries(pyImpactX PRIVATE pybind11::lto)
         endif()
     endif()

cmake/dependencies/pybind11.cmake

@@ -37,7 +37,7 @@ function(find_pybind11)
             mark_as_advanced(FETCHCONTENT_UPDATES_DISCONNECTED_FETCHEDpybind11)
         endif()
     else()
-        find_package(pybind11 2.12.0 CONFIG REQUIRED)
+        find_package(pybind11 2.13.0 CONFIG REQUIRED)
         message(STATUS "pybind11: Found version '${pybind11_VERSION}'")
     endif()
 endfunction()
@@ -52,7 +52,7 @@ option(ImpactX_pybind11_internal "Download & build pybind11" ON)
 set(ImpactX_pybind11_repo "https://github.com/pybind/pybind11.git"
     CACHE STRING
     "Repository URI to pull and build pybind11 from if(ImpactX_pybind11_internal)")
-set(ImpactX_pybind11_branch "v2.12.0"
+set(ImpactX_pybind11_branch "v2.13.6"
     CACHE STRING
     "Repository branch for ImpactX_pybind11_repo if(ImpactX_pybind11_internal)")
 

docs/source/install/dependencies.rst

@@ -28,7 +28,7 @@ Optional dependencies include:
   - see `optional I/O backends <https://github.com/openPMD/openPMD-api#dependencies>`__
 - `CCache <https://ccache.dev>`__: to speed up rebuilds (For CUDA support, needs version 3.7.9+ and 4.2+ is recommended)
 - `Ninja <https://ninja-build.org>`__: for faster parallel compiles
-- `Python 3.8+ <https://www.python.org>`__
+- `Python 3.9+ <https://www.python.org>`__
 
   - `mpi4py <https://mpi4py.readthedocs.io>`__
   - `numpy <https://numpy.org>`__

setup.py

@@ -260,7 +260,7 @@ def build_extension(self, ext):
     ext_modules=cxx_modules,
     cmdclass=cmdclass,
     zip_safe=False,
-    python_requires=">=3.8",
+    python_requires=">=3.8",  # left for CI, truly ">=3.9"
     tests_require=["numpy", "pandas", "pytest", "scipy"],
     install_requires=install_requires,
     # cmdclass={'test': PyTest},
@@ -278,10 +278,11 @@ def build_extension(self, ext):
         "Topic :: Software Development :: Libraries",
         "Programming Language :: C++",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
         (
             "License :: OSI Approved :: " "BSD License"
         ),  # TODO: use real SPDX: BSD-3-Clause-LBNL