[Build] Fix the NO_LINK build

The NO_LINK build had bitrot and was no longer building. This fixes the
issue by properly disabling Link-related code, including unreachable
functions when the project is built with ENABLE_LINK=FALSE

src/wx/cmdevents.cpp

@@ -2521,6 +2521,8 @@ EVT_HANDLER(VSync, "Wait for vertical sync")
     GetMenuOptionConfig("VSync", config::OptionID::kPrefVsync);
 }
 
+#ifndef NO_LINK
+
 void MainFrame::EnableNetworkMenu()
 {
     cmd_enable &= ~CMDEN_LINK_ANY;
@@ -2545,12 +2547,12 @@ void SetLinkTypeMenu(const char* type, int value)
     mf->SetMenuOption(type, 1);
     gopts.gba_link_type = value;
     update_opts();
-#ifndef NO_LINK
     CloseLink();
-#endif
     mf->EnableNetworkMenu();
 }
 
+#endif  // NO_LINK
+
 EVT_HANDLER_MASK(LanLink, "Start Network link", CMDEN_LINK_ANY)
 {
 #ifndef NO_LINK
@@ -2577,42 +2579,58 @@ EVT_HANDLER_MASK(LanLink, "Start Network link", CMDEN_LINK_ANY)
 
 EVT_HANDLER(LinkType0Nothing, "Link nothing")
 {
+#ifndef NO_LINK
     SetLinkTypeMenu("LinkType0Nothing", 0);
+#endif
 }
 
 EVT_HANDLER(LinkType1Cable, "Link cable")
 {
+#ifndef NO_LINK
     SetLinkTypeMenu("LinkType1Cable", 1);
+#endif
 }
 
 EVT_HANDLER(LinkType2Wireless, "Link wireless")
 {
+#ifndef NO_LINK
     SetLinkTypeMenu("LinkType2Wireless", 2);
+#endif
 }
 
 EVT_HANDLER(LinkType3GameCube, "Link GameCube")
 {
+#ifndef NO_LINK
     SetLinkTypeMenu("LinkType3GameCube", 3);
+#endif
 }
 
 EVT_HANDLER(LinkType4Gameboy, "Link Gameboy")
 {
+#ifndef NO_LINK
     SetLinkTypeMenu("LinkType4Gameboy", 4);
+#endif
 }
 
 EVT_HANDLER(LinkAuto, "Enable link at boot")
 {
+#ifndef NO_LINK
     GetMenuOptionConfig("LinkAuto", config::OptionID::kGBALinkAuto);
+#endif
 }
 
 EVT_HANDLER(SpeedOn, "Enable faster network protocol by default")
 {
+#ifndef NO_LINK
     GetMenuOptionConfig("SpeedOn", config::OptionID::kGBALinkFast);
+#endif
 }
 
 EVT_HANDLER(LinkProto, "Local host IPC")
 {
+#ifndef NO_LINK
     GetMenuOptionConfig("LinkProto", config::OptionID::kGBALinkProto);
+#endif
 }
 
 EVT_HANDLER(LinkConfigure, "Link options...")

src/wx/wxvbam.cpp

@@ -827,13 +827,13 @@ MainFrame::MainFrame()
       menus_opened(0),
       dialog_opened(0),
       focused(false),
+#ifndef NO_LINK
+      gba_link_observer_(config::OptionID::kGBALinkHost,
+                         std::bind(&MainFrame::EnableNetworkMenu, this)),
+#endif
       keep_on_top_styler_(this),
       status_bar_observer_(config::OptionID::kGenStatusBar,
-                           std::bind(&MainFrame::OnStatusBarChanged,
-                                     this,
-                                     std::placeholders::_1)),
-      gba_link_observer_(config::OptionID::kGBALinkHost,
-                         std::bind(&MainFrame::EnableNetworkMenu, this)) {
+                           std::bind(&MainFrame::OnStatusBarChanged, this, std::placeholders::_1)) {
     jpoll = new JoystickPoller();
     this->Connect(wxID_ANY, wxEVT_SHOW, wxShowEventHandler(JoystickPoller::ShowDialog), jpoll, jpoll);
 }
@@ -1263,6 +1263,8 @@ void MainFrame::StopModal()
         panel->Resume();
 }
 
+#ifndef NO_LINK
+
 LinkMode MainFrame::GetConfiguredLinkMode()
 {
     switch (gopts.gba_link_type) {
@@ -1306,6 +1308,8 @@ LinkMode MainFrame::GetConfiguredLinkMode()
     return LINK_DISCONNECTED;
 }
 
+#endif  // NO_LINK
+
 void MainFrame::IdentifyRom()
 {
     if (!panel->rom_name.empty())

src/wx/wxvbam.h

@@ -246,7 +246,9 @@ public:
 
     // adjust menus based on current cmd_enable
     void enable_menus();
+#ifndef NO_LINK
     void EnableNetworkMenu();
+#endif
 
     // adjust menus based on available save game states
     void update_state_ts(bool force = false);
@@ -268,8 +270,10 @@ public:
         return focused;
     }
 
+#ifndef NO_LINK
     // Returns the link mode to set according to the options
     LinkMode GetConfiguredLinkMode();
+#endif
 
     void IdentifyRom();
 
@@ -352,9 +356,11 @@ private:
     JoystickPoller* jpoll = nullptr;
     // quicker & more accurate than FindFocus() != NULL
     bool focused;
+#ifndef NO_LINK
+    const config::OptionsObserver gba_link_observer_;
+#endif
     const widgets::KeepOnTopStyler keep_on_top_styler_;
     const config::OptionsObserver status_bar_observer_;
-    const config::OptionsObserver gba_link_observer_;
 
     // helper function for adding menu to accel editor
     void add_menu_accels(wxTreeCtrl* tc, wxTreeItemId& parent, wxMenu* menu);