doc: Fix all clang parse errors in QtBase during PCH build

This update eliminates ALL parsing errors when clang parses the
Qt headers to build the precompiled header qdoc needs. These errors
are often cases where an old use of Q_QDOC no longer works because
clang sees the enclosed fake declarations as erroneous.

In a few cases, clang reported errors because two dummy function
declartations under the Q_CLANG_QDOC guard were indistinguishable,
so one of them was removed, and the documentation was patched
accordingly.

Using the macro Q_DECLARE_INTERFACE(...) causes clang to report errors
because the class parametewr is abstract. These uses of the macro are
not needed, so they are removed with #ifndef Q_CLANG_QDOC.

Some declarations of default GL types that had been provided for qdoc
were no longer needed, so they are removed.

Now there are some member function signatures in QDBusPendingReply
and QDBusPendingCall that have very long template clauses and qualifiers
in their signatures. These unwieldy signatures will be unnecessary in the
documentation and will look bad there, but for now they are correct. The
ultimate solution will be to add a metacommand to qdoc, something like
\simplify-signature to tell qdoc to generate the documentation for these
member functions without the long template caluses and qualifiers.

Change-Id: I012cf17a544fbba2ebc71002f31bdc865119bb8e
Reviewed-by: Paul Wicking <paul.wicking@qt.io>
Reviewed-by: Topi Reiniö <topi.reinio@qt.io>
Reviewed-by: Martin Smith <martin.smith@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/widgets/dialogs/qmessagebox.h b/src/widgets/dialogs/qmessagebox.h
index 4b993a9e65..0a2edb1eee 100644
--- a/src/widgets/dialogs/qmessagebox.h
+++ b/src/widgets/dialogs/qmessagebox.h
@@ -284,9 +284,9 @@ public:
 Q_SIGNALS:
     void buttonClicked(QAbstractButton *button);
 
-#ifdef Q_QDOC
+#ifdef Q_CLANG_QDOC
 public Q_SLOTS:
-    int exec();
+    int exec() override;
 #endif
 
 protected: