Add ABI check to CI

This adds a dump of current ABIs (which will probably be released
as 1.4.0) to the test directory, and adds a comparison to current
ABIs to the distcheck

.github/workflows/distcheck.yml

@@ -1,4 +1,4 @@
-name: Autotools distcheck
+name: Autotools distcheck and ABI check
 
 on:
   push:
@@ -9,14 +9,14 @@ on:
 
 jobs:
   distcheck:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v2
 
       - name: Install Linux dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install -y libtool-bin libogg-dev doxygen libxml2-utils w3c-sgml-lib pandoc
+          sudo apt-get install -y libtool-bin libogg-dev doxygen libxml2-utils w3c-sgml-lib pandoc abi-compliance-checker
 
       - name: Build with Autotools
         run: |
@@ -26,9 +26,19 @@ jobs:
       - name: Build and check source package
         run: make distcheck
 
+      - name: Check binary compatibility
+        run: |
+          make
+          unxz --keep test/abi/abi-libFLAC-1.4.0.dump.xz
+          unxz --keep test/abi/abi-libFLAC++-1.4.0.dump.xz
+          abi-compliance-checker -l flac -old test/abi/abi-libFLAC-1.4.0.dump -new test/abi/abi-descriptor-libFLAC-1.4.0.xml
+          abi-compliance-checker -l flac++ -old test/abi/abi-libFLAC++-1.4.0.dump -new test/abi/abi-descriptor-libFLAC++-1.4.0.xml
+
       - name: Upload logs on failure
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         if: failure()
         with:
           name: flac-${{ github.sha }}-${{ github.run_id }}-logs
-          path: ./**/*.log
+          path: |
+            ./flac-**/**/*.log
+            ./compat_reports

test/abi/abi-descriptor-libFLAC++-1.4.0.xml

@@ -0,0 +1,11 @@
+<version>
+    1.4.0
+</version>
+
+<headers>
+    include/FLAC++/all.h
+</headers>
+
+<libs>
+    src/libFLAC++/.libs/libFLAC++.so.10.0.0
+</libs>

test/abi/abi-descriptor-libFLAC-1.4.0.xml

@@ -0,0 +1,11 @@
+<version>
+    1.4.0
+</version>
+
+<headers>
+    include/FLAC/all.h
+</headers>
+
+<libs>
+    src/libFLAC/.libs/libFLAC.so.12.0.0
+</libs>