# --- T2-COPYRIGHT-BEGIN ---
# t2/package/*/open-vm-tools/hotix-sigc++-3.8.patch
# Copyright (C) 2026 The T2 SDE Project
# SPDX-License-Identifier: GPL-2.0 or patched project license
# --- T2-COPYRIGHT-END ---

Use the signal<R(T...)> syntax and drop the slot/signal<R, T...> bridge,
libsigc++ 3.8 defines these primary templates itself.

diff -Nrup open-vm-tools-stable-13.1.0.orig/open-vm-tools/lib/include/sigc++2to3.h open-vm-tools-stable-13.1.0/open-vm-tools/lib/include/sigc++2to3.h
--- open-vm-tools-stable-13.1.0.orig/open-vm-tools/lib/include/sigc++2to3.h	2026-05-14 06:59:48.000000000 +0200
+++ open-vm-tools-stable-13.1.0/open-vm-tools/lib/include/sigc++2to3.h	2026-09-27 19:02:25.332379560 +0200
@@ -36,18 +36,7 @@
 namespace sigc {
 
 
-// Bridge slot syntax change
-template <typename T_ret, typename... T_args>
-class slot : public slot<T_ret(T_args...)> {
-private:
-   using _true_slot = slot<T_ret(T_args...)>;
-public:
-   inline slot() = default;
-   inline slot(const _true_slot& src) : _true_slot(src) {}
-   template<typename T_functor>
-   inline slot(const T_functor& func) : _true_slot(func) {}
-};
-
+// sigc++ 3.8 rejects slot/signal<R, T...>, users need <R(T...)>
 template <typename T_ret>
 using slot0 = slot<T_ret()>;
 template <typename T_ret, typename T_arg1>
@@ -66,17 +55,6 @@ template <typename T_ret, typename T_arg
 using slot7 = slot<T_ret(T_arg1, T_arg2, T_arg3, T_arg4, T_arg5, T_arg6, T_arg7)>;
 
 
-// Bridge signal syntax change
-template <typename T_ret, typename... T_args>
-class signal : public signal<T_ret(T_args...)>, public trackable {
-public:
-   signal() = default;
-
-   decltype(auto) make_slot() const {
-      return mem_fun(*this, &signal::emit);
-   }
-};
-
 template <typename T_ret>
 using signal0 = signal<T_ret()>;
 template <typename T_ret, typename T_arg1>
diff -Nrup open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/dnd/copyPasteRpc.hh open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/dnd/copyPasteRpc.hh
--- open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/dnd/copyPasteRpc.hh	2026-05-14 06:59:48.000000000 +0200
+++ open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/dnd/copyPasteRpc.hh	2026-09-27 19:02:08.855554586 +0200
@@ -39,18 +39,18 @@ public:
    virtual ~CopyPasteRpc(void) {};
 
    /* sigc signals for CopyPaste source callback. */
-   sigc::signal<void, uint32, bool, const CPClipboard*> srcRecvClipChanged;
-   sigc::signal<void, uint32, const uint8 *, uint32> requestFilesChanged;
-   sigc::signal<void, uint32, bool, const uint8 *, uint32> getFilesDoneChanged;
+   sigc::signal<void(uint32, bool, const CPClipboard*)> srcRecvClipChanged;
+   sigc::signal<void(uint32, const uint8 *, uint32)> requestFilesChanged;
+   sigc::signal<void(uint32, bool, const uint8 *, uint32)> getFilesDoneChanged;
 
    /* sigc signal for CopyPaste destination callback. */
-   sigc::signal<void, uint32, bool> destRequestClipChanged;
+   sigc::signal<void(uint32, bool)> destRequestClipChanged;
 
    /* sigc signal for ping reply callback. */
-   sigc::signal<void, uint32> pingReplyChanged;
+   sigc::signal<void(uint32)> pingReplyChanged;
 
    /* sigc signal for rpc command reply received. */
-   sigc::signal<void, uint32, uint32> cmdReplyChanged;
+   sigc::signal<void(uint32, uint32)> cmdReplyChanged;
 
    virtual void Init(void) = 0;
    virtual void SendPing(uint32 caps) = 0;
diff -Nrup open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/dnd/dndRpc.hh open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/dnd/dndRpc.hh
--- open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/dnd/dndRpc.hh	2026-05-14 06:59:48.000000000 +0200
+++ open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/dnd/dndRpc.hh	2026-09-27 19:02:08.855897915 +0200
@@ -40,30 +40,30 @@ public:
    virtual ~DnDRpc(void) {};
 
    /* sigc signals for DnD source callback. */
-   sigc::signal<void, uint32, const CPClipboard *> srcDragBeginChanged;
-   sigc::signal<void, uint32> srcCancelChanged;
-   sigc::signal<void, uint32, uint32, uint32> srcDropChanged;
+   sigc::signal<void(uint32, const CPClipboard *)> srcDragBeginChanged;
+   sigc::signal<void(uint32)> srcCancelChanged;
+   sigc::signal<void(uint32, uint32, uint32)> srcDropChanged;
 
    /* sigc signals for DnD destination callback. */
-   sigc::signal<void, uint32, int32> destDragEnterReplyChanged;
-   sigc::signal<void, uint32> destPrivDragEnterChanged;
-   sigc::signal<void, uint32, int32, int32> destPrivDragLeaveChanged;
-   sigc::signal<void, uint32, int32, int32> destPrivDropChanged;
-   sigc::signal<void, uint32, int32, int32> destDropChanged;
-   sigc::signal<void, uint32> destCancelChanged;
-
-   sigc::signal<void, uint32, int32, int32> moveMouseChanged;
-   sigc::signal<void, uint32, uint32> updateFeedbackChanged;
-   sigc::signal<void, uint32, int32, int32> queryExitingChanged;
-   sigc::signal<void, uint32> dragNotPendingChanged;
-   sigc::signal<void, uint32, const uint8 *, uint32> requestFileChanged;
-   sigc::signal<void, uint32, bool, const uint8 *, uint32> getFilesDoneChanged;
+   sigc::signal<void(uint32, int32)> destDragEnterReplyChanged;
+   sigc::signal<void(uint32)> destPrivDragEnterChanged;
+   sigc::signal<void(uint32, int32, int32)> destPrivDragLeaveChanged;
+   sigc::signal<void(uint32, int32, int32)> destPrivDropChanged;
+   sigc::signal<void(uint32, int32, int32)> destDropChanged;
+   sigc::signal<void(uint32)> destCancelChanged;
+
+   sigc::signal<void(uint32, int32, int32)> moveMouseChanged;
+   sigc::signal<void(uint32, uint32)> updateFeedbackChanged;
+   sigc::signal<void(uint32, int32, int32)> queryExitingChanged;
+   sigc::signal<void(uint32)> dragNotPendingChanged;
+   sigc::signal<void(uint32, const uint8 *, uint32)> requestFileChanged;
+   sigc::signal<void(uint32, bool, const uint8 *, uint32)> getFilesDoneChanged;
 
    /* sigc signal for responding to ping reply */
-   sigc::signal<void, uint32> pingReplyChanged;
+   sigc::signal<void(uint32)> pingReplyChanged;
 
    /* sigc signal for rpc cmd reply received. */
-   sigc::signal<void, uint32, uint32> cmdReplyChanged;
+   sigc::signal<void(uint32, uint32)> cmdReplyChanged;
 
    /* DnD source. */
    virtual bool SrcDragBeginDone(uint32 sessionId) = 0;
diff -Nrup open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/dnd/fileTransferRpc.hh open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/dnd/fileTransferRpc.hh
--- open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/dnd/fileTransferRpc.hh	2026-05-14 06:59:48.000000000 +0200
+++ open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/dnd/fileTransferRpc.hh	2026-09-27 19:02:08.856044922 +0200
@@ -38,8 +38,8 @@ class LIB_EXPORT FileTransferRpc
 public:
    virtual ~FileTransferRpc(void) {};
 
-   sigc::signal<void, uint32, const uint8 *, size_t> HgfsPacketReceived;
-   sigc::signal<void, uint32, const uint8 *, size_t> HgfsReplyReceived;
+   sigc::signal<void(uint32, const uint8 *, size_t)> HgfsPacketReceived;
+   sigc::signal<void(uint32, const uint8 *, size_t)> HgfsReplyReceived;
 
    virtual void Init(void) = 0;
    virtual bool SendHgfsPacket(uint32 sessionId,
diff -Nrup open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/dndGuestBase/guestCopyPaste.hh open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/dndGuestBase/guestCopyPaste.hh
--- open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/dndGuestBase/guestCopyPaste.hh	2026-05-14 06:59:48.000000000 +0200
+++ open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/dndGuestBase/guestCopyPaste.hh	2026-09-27 19:02:08.856483004 +0200
@@ -48,9 +48,9 @@ public:
    GuestCopyPasteMgr(DnDCPTransport *transport);
    ~GuestCopyPasteMgr(void);
 
-   sigc::signal<void, const CPClipboard*> srcRecvClipChanged;
-   sigc::signal<void> destRequestClipChanged;
-   sigc::signal<void, bool> getFilesDoneChanged;
+   sigc::signal<void(const CPClipboard*)> srcRecvClipChanged;
+   sigc::signal<void()> destRequestClipChanged;
+   sigc::signal<void(bool)> getFilesDoneChanged;
 
    GUEST_CP_STATE GetState(void) { return mCPState; }
    void SetState(GUEST_CP_STATE state);
diff -Nrup open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/dndGuestBase/guestDnD.hh open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/dndGuestBase/guestDnD.hh
--- open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/dndGuestBase/guestDnD.hh	2026-05-14 06:59:48.000000000 +0200
+++ open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/dndGuestBase/guestDnD.hh	2026-09-27 19:02:08.856576899 +0200
@@ -73,18 +73,18 @@ public:
                ToolsAppCtx *ctx);
    virtual ~GuestDnDMgr(void);
 
-   sigc::signal<void, int, int> moveMouseChanged;
-   sigc::signal<void, bool, int, int> updateDetWndChanged;
-   sigc::signal<void, GUEST_DND_STATE> stateChanged;
+   sigc::signal<void(int, int)> moveMouseChanged;
+   sigc::signal<void(bool, int, int)> updateDetWndChanged;
+   sigc::signal<void(GUEST_DND_STATE)> stateChanged;
 
-   sigc::signal<void, const CPClipboard*, std::string> srcDragBeginChanged;
-   sigc::signal<void> srcDropChanged;
-   sigc::signal<void> srcCancelChanged;
-   sigc::signal<void, bool> getFilesDoneChanged;
+   sigc::signal<void(const CPClipboard*, std::string)> srcDragBeginChanged;
+   sigc::signal<void()> srcDropChanged;
+   sigc::signal<void()> srcCancelChanged;
+   sigc::signal<void(bool)> getFilesDoneChanged;
 
-   sigc::signal<void> destCancelChanged;
-   sigc::signal<void, int32, int32> privDropChanged;
-   sigc::signal<void> destMoveDetWndToMousePosChanged;
+   sigc::signal<void()> destCancelChanged;
+   sigc::signal<void(int32, int32)> privDropChanged;
+   sigc::signal<void()> destMoveDetWndToMousePosChanged;
 
    GuestDnDSrc *GetDnDSrc(void) { return mSrc; }
    GuestDnDDest *GetDnDDest(void) { return mDest; }
diff -Nrup open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/xutils/xutils.cc open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/xutils/xutils.cc
--- open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/xutils/xutils.cc	2026-05-14 06:59:48.000000000 +0200
+++ open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/xutils/xutils.cc	2026-09-27 19:02:08.856960229 +0200
@@ -42,14 +42,14 @@ namespace xutils {
 
 
 /* Actual definitions of the signals in this class. */
-sigc::signal<void, Glib::RefPtr<Gdk::Screen> > currentDesktopChanged;
-sigc::signal<void, Glib::RefPtr<Gdk::Screen> > desktopLayoutChanged;
-sigc::signal<void, Glib::RefPtr<Gdk::Screen> > desktopGeometryChanged;
-sigc::signal<void, Glib::RefPtr<Gdk::Screen> > desktopViewportChanged;
-sigc::signal<void, Glib::RefPtr<Gdk::Screen> > windowStackChanged;
-sigc::signal<void, Glib::RefPtr<Gdk::Screen> > windowManagerChanged;
-sigc::signal<void, Glib::RefPtr<Gdk::Screen> > activeWindowChanged;
-sigc::signal<void, Glib::RefPtr<Gdk::Screen> > workAreaChanged;
+sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> currentDesktopChanged;
+sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> desktopLayoutChanged;
+sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> desktopGeometryChanged;
+sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> desktopViewportChanged;
+sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> windowStackChanged;
+sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> windowManagerChanged;
+sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> activeWindowChanged;
+sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> workAreaChanged;
 
 /* Necessary for calculating per-monitor _NET_WORKAREA in GetMonitorWorkArea() */
 struct NETWMStrutPartial {
diff -Nrup open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/xutils/xutils.hh open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/xutils/xutils.hh
--- open-vm-tools-stable-13.1.0.orig/open-vm-tools/services/plugins/dndcp/xutils/xutils.hh	2026-05-14 06:59:48.000000000 +0200
+++ open-vm-tools-stable-13.1.0/open-vm-tools/services/plugins/dndcp/xutils/xutils.hh	2026-09-27 19:02:08.857300508 +0200
@@ -65,22 +65,22 @@ uint32 GetDesktopForWindow(Glib::RefPtr<
 
 uint32 GetNumDesktops(Glib::RefPtr<Gdk::Screen> screen);
 uint32 GetCurrentDesktop(Glib::RefPtr<Gdk::Screen> screen);
-extern sigc::signal<void, Glib::RefPtr<Gdk::Screen> > currentDesktopChanged;
+extern sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> currentDesktopChanged;
 
 bool GetDesktopLayout(Glib::RefPtr<Gdk::Screen> screen,
                       uint32& rows, uint32& columns, Gtk::CornerType& corner,
                       Gtk::Orientation& orientation);
-extern sigc::signal<void, Glib::RefPtr<Gdk::Screen> > desktopLayoutChanged;
+extern sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> desktopLayoutChanged;
 
 bool GetDesktopGeometry(Glib::RefPtr<Gdk::Screen> screen,
                         uint32& width, uint32& height);
-extern sigc::signal<void, Glib::RefPtr<Gdk::Screen> > desktopGeometryChanged;
+extern sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> desktopGeometryChanged;
 
 bool GetDesktopViewport(Glib::RefPtr<Gdk::Screen> screen,
                         uint32 desktopIndex, VMPoint& viewport);
-extern sigc::signal<void, Glib::RefPtr<Gdk::Screen> > desktopViewportChanged;
+extern sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> desktopViewportChanged;
 
-extern sigc::signal<void, Glib::RefPtr<Gdk::Screen> > activeWindowChanged;
+extern sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> activeWindowChanged;
 
 /* Window stacking */
 void RaiseWindow(Glib::RefPtr<Gdk::Window> window,
@@ -88,7 +88,7 @@ void RaiseWindow(Glib::RefPtr<Gdk::Windo
                     Glib::RefPtr<Gdk::Window>(),
                  guint32 timestamp = 0);
 HostWindowList GetHostWindowStack();
-extern sigc::signal<void, Glib::RefPtr<Gdk::Screen> > windowStackChanged;
+extern sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> windowStackChanged;
 
 
 /* Multi-head */
@@ -96,7 +96,7 @@ void GetMonitorWorkArea(Glib::RefPtr<Gdk
                         int monitor, Gdk::Rectangle& rect);
 
 utf::string GetWindowManagerName(Glib::RefPtr<Gdk::Screen> screen);
-extern sigc::signal<void, Glib::RefPtr<Gdk::Screen> > windowManagerChanged;
+extern sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> windowManagerChanged;
 
 void SetFullscreenMonitorsHint(Glib::RefPtr<Gdk::Window> window,
                                std::vector<long> topology);
@@ -109,7 +109,7 @@ void GetPointerLocation(const Glib::RefP
                         int& x, int& y, Gdk::ModifierType& mask);
 
 
-extern sigc::signal<void, Glib::RefPtr<Gdk::Screen> > workAreaChanged;
+extern sigc::signal<void(Glib::RefPtr<Gdk::Screen>)> workAreaChanged;
 
 bool GetXWindowSize(const Glib::RefPtr<Gdk::Window>& window, int& width,
                     int& height);