Bump minimum Python version to 3.10 and update CI matrix, and try and fix conda build

Author: astrofrog

.github/workflows/main.yml

@@ -21,35 +21,29 @@ jobs:
 
         # Standard tests
 
-        - linux: py38-test-oldestdeps
-        - linux: py39-test
-        - linux: py310-test
+        - linux: py310-test-oldestdeps
         - linux: py311-test
         - linux: py312-test
         - linux: py313-test
-        - linux: py312-test-devdeps
+        - linux: py313-test-devdeps
 
-        - macos: py312-test-devdeps
+        - macos: py312-test
           posargs: --openmp-expected=False
-        - macos: py313-test
+        - macos: py313-test-devdeps
           posargs: --openmp-expected=False
 
-        - windows: py38-test
-          runs-on: windows-2019
+        - windows: py310-test
         - windows: py312-test-devdeps
-          runs-on: windows-2019
 
         # Test with more compilers, for the OpenMP helpers
-        - macos: py311-test-osxclang-conda
+        - macos: py313-test-osxclang-conda
           runs-on: macos-13
-          toxdeps: 'tox>=4'
           coverage: ''
-        - linux: py39-test-linuxgcc-conda
-          toxdeps: 'tox>=4'
+        - linux: py310-test-linuxgcc-conda
           coverage: ''
 
         # Test downstream packages
-        - linux: py312-downstream
+        - linux: py313-downstream
 
   publish:
     needs: tests

pyproject.toml

@@ -16,9 +16,9 @@ classifiers = [
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Topic :: System :: Archiving :: Packaging",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.10"
 dependencies = [
-    "setuptools>=40.2",
+    "setuptools>=64",
     "tomli>=1.0.0 ; python_version < '3.11'",
 ]
 dynamic = ["version"]

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 envlist =
-    py{38,39,310,311,312}-test{,-osxclang,-linuxgcc}{,-conda}{,-devdeps}
-    py{38,39,310,311,312}-downstream
+    py{310,311,312,313}-test{,-osxclang,-linuxgcc}{,-conda}{,-devdeps}
+    py{310,311,312,313}-downstream
     style
 
 # conda jobs need this because it is pulling in tox 3, not 4
@@ -11,7 +11,7 @@ isolated_build = true
 passenv =
     CONDA_BUILD_SYSROOT,CI
 setenv =
-    osxclang: CC=clang-10
+    osxclang: CC=clang-20
     linuxgcc: CC=gcc_linux-64
 changedir =
     test: .tmp/{envname}
@@ -22,10 +22,10 @@ description =
     devdeps: run tests with developer versions of setuptools
     oldestdeps: run tests with oldest supported version of setuptools
 deps =
-    oldestdeps: setuptools==42.0
+    oldestdeps: setuptools==64
     devdeps: git+https://github.com/pypa/setuptools.git
 conda_deps =
-    osxclang: clang_osx-64==10
+    osxclang: clang-20
     osxclang: llvm-openmp
     linuxgcc: gcc_linux-64
 conda_channels =
@@ -37,7 +37,7 @@ commands =
     test: python -c 'import setuptools; print(setuptools.__version__)'
     test: pytest --pyargs extension_helpers {toxinidir}/docs --cov extension_helpers --cov-config={toxinidir}/pyproject.toml {posargs}
 
-[testenv:py{38,39,310,311,312}-downstream]
+[testenv:py{310,311,312,313}-downstream]
 changedir = .tmp/downstream
 commands =
     pip install setuptools setuptools_scm wheel cython numpy