build: adopt manylinux_2_28 on 3.14

This is only needed for ppc64le, which breaks when we introduce cffi
2.0 for free-threaded support (it appears the pre-built 2.0.0b wheels
have an glibc 2.22 symbol - unsure if this is a bug).

But, `manylinux2014` is getting long in the tooth. I'm not convinced we
need to provide binaries that work on distros from 2013. Especially for
a Python version released in 2025. So let's just bump the ABI on all
3.14 wheels.

Author: indygreg

.github/workflows/wheel.yml

@@ -28,6 +28,7 @@ jobs:
           - 'musllinux'
         image:
           - 'manylinux2014'
+          - 'manylinux_2_28'
           - 'musllinux_1_1'
           - 'musllinux_1_2'
         exclude:
@@ -45,6 +46,19 @@ jobs:
             image: 'musllinux_1_1'
           - arch: 's390x'
             image: 'musllinux_1_1'
+          # Switch to manylinux_2_28 on 3.14+.
+          - py: 'cp39'
+            image: 'manylinux_2_28'
+          - py: 'cp310'
+            image: 'manylinux_2_28'
+          - py: 'cp311'
+            image: 'manylinux_2_28'
+          - py: 'cp312'
+            image: 'manylinux_2_28'
+          - py: 'cp313'
+            image: 'manylinux_2_28'
+          - py: 'cp314'
+            image: 'manylinux2014'
           # Drop support for musllinux_1_1 on 3.14+
           - py: 'cp314'
             image: 'musllinux_1_1'

docs/news.rst

@@ -35,6 +35,10 @@ Version History
   to figure out how to thread config settings into ``setup.py`` invocations.
   (`--build-option`` is sent to the ``build_wheel`` command but not the
   ``build_editable`` command.)
+* Python 3.14 wheels are now ``manylinux_2_28`` (versus ``manylinux2014``)
+  for older Python versions. This raises the minimum glibc version from
+  2.14 to 2.28, effectively dropping support for Debian 8 and 9, Ubuntu
+  13.10 through 18.04, Fedora 19 to 28, and RHEL/Centos 7.
 
 0.24.0 (released 2025-08-17)
 ============================