Add a script and CI action for tests/allheaders.h

Check that all headers are either #included or mentioned
in tests/allheaders.h.

.github/workflows/code_checks.yml

@@ -101,3 +101,15 @@ jobs:
               echo "::error ::Please use C++11 equivalents of the deprecated macros in the new code."
               exit 1
             fi
+
+  check-allheaders:
+    runs-on: ubuntu-20.04
+    name: Check All Headers In allheaders.h
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Check that all headers are listed in tests/allheaders.h
+        run: |
+            ./misc/scripts/check_allheaders.sh

misc/scripts/check_allheaders.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+cd $(dirname "$0")/../..
+
+rc=0
+
+for h in include/wx/*.h ; do
+    header=wx/$(basename "$h")
+        if ! grep -q "$header" tests/allheaders.h ; then
+            echo "ERROR - <$header> not present in tests/allheaders.h"
+            rc=$((rc+1))
+        fi
+done
+
+exit $rc