[3.13] Add the Python 3.13 abidump, and enable the ABI check. (#122583)

dd the Python 3.13 abidump, and enable the ABI check.

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

.github/workflows/build.yml

@@ -40,6 +40,49 @@ jobs:
     if: fromJSON(needs.check_source.outputs.run-docs)
     uses: ./.github/workflows/reusable-docs.yml
 
+  check_abi:
+    name: 'Check if the ABI has changed'
+    runs-on: ubuntu-latest
+    needs: check_source
+    if: needs.check_source.outputs.run_tests == 'true'
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+      - name: Install dependencies
+        run: |
+            sudo ./.github/workflows/posix-deps-apt.sh
+            sudo apt-get install -yq abigail-tools
+      - name: Build CPython
+        env:
+          CFLAGS: -g3 -O0
+        run: |
+          # Build Python with the libpython dynamic library
+          ./configure --enable-shared
+          make -j4
+      - name: Check for changes in the ABI
+        id: check
+        run: |
+          if ! make check-abidump; then
+            echo "Generated ABI file is not up to date."
+            echo "Please add the release manager of this branch as a reviewer of this PR."
+            echo ""
+            echo "The up to date ABI file should be attached to this build as an artifact."
+            echo ""
+            echo "To learn more about this check: https://devguide.python.org/getting-started/setup-building/index.html#regenerate-the-abi-dump"
+            echo ""
+            exit 1
+          fi
+      - name: Generate updated ABI files
+        if: ${{ failure() && steps.check.conclusion == 'failure' }}
+        run: |
+          make regen-abidump
+      - uses: actions/upload-artifact@v4
+        name: Publish updated ABI files
+        if: ${{ failure() && steps.check.conclusion == 'failure' }}
+        with:
+          name: abi-data
+          path: ./Doc/data/*.abi
+
   check_generated_files:
     name: 'Check if generated files are up to date'
     # Don't use ubuntu-latest but a specific version to make the job

.gitignore

@@ -169,5 +169,3 @@ Python/frozen_modules/MANIFEST
 /python
 !/Python/
 
-# main branch only: ABI files are not checked/maintained.
-Doc/data/python*.abi