qdoc: Correctly resolve qualified path of external base classes

Often, a documented class inherits from a base that lives in
another documentation module. QDoc recorded only the class
name of such bases, omitting any qualified path. Fix this issue
in the Clang-parser.

Add an autotest for verifying documentation with cross-module
inheritance and links. This requires adding a mechanism for
copying the generated .index file(s) into a location where
QDoc searches index files in.

Fixes: QTBUG-81793
Change-Id: I4019a1ca3a0e4c69bccc1a92740fd51907bfb24d
Reviewed-by: Paul Wicking <paul.wicking@qt.io>

1 files changed, 3 insertions, 2 deletions

diff --git a/src/qdoc/clangcodeparser.cpp b/src/qdoc/clangcodeparser.cpp
index ed5272b8a..169cfc568 100644
--- a/src/qdoc/clangcodeparser.cpp
+++ b/src/qdoc/clangcodeparser.cpp
@@ -689,8 +689,9 @@ CXChildVisitResult ClangVisitor::visitHeader(CXCursor cursor, CXSourceLocation l
         auto baseNode = findNodeForCursor(qdb_, baseCursor);
         auto classe = static_cast<ClassNode *>(parent_);
         if (baseNode == nullptr || !baseNode->isClassNode()) {
-            QString bcName = fromCXString(clang_getCursorSpelling(baseCursor));
-            classe->addUnresolvedBaseClass(access, QStringList(bcName), bcName);
+            QString bcName = reconstructQualifiedPathForCursor(baseCursor);
+            classe->addUnresolvedBaseClass(access,
+                bcName.split(QLatin1String("::"), QString::SkipEmptyParts), bcName);
             return CXChildVisit_Continue;
         }
         auto baseClasse = static_cast<ClassNode *>(baseNode);