Fix wxGLCanvas compilation with wxUSE_PALETTE==0.

This fixes compilation problems with the minimal build of wxGTK and will make
removing palette support in the future simpler.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@66088 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/glcanvas.h

@@ -113,7 +113,9 @@ public:
     // check if the given attributes are supported without creating a canvas
     static bool IsDisplaySupported(const int *attribList);
 
+#if wxUSE_PALETTE
     const wxPalette *GetPalette() const { return &m_palette; }
+#endif // wxUSE_PALETTE
 
     // miscellaneous helper functions
     // ------------------------------
@@ -149,16 +151,18 @@ protected:
     // (currently only implemented in wxX11 and wxMotif ports)
     virtual int GetColourIndex(const wxColour& WXUNUSED(col)) { return -1; }
 
-    // create default palette if we're not using RGBA mode
-    // (not supported in most ports)
-    virtual wxPalette CreateDefaultPalette() { return wxNullPalette; }
-
     // check if the given extension name is present in the space-separated list
     // of extensions supported by the current implementation such as returned
     // by glXQueryExtensionsString() or glGetString(GL_EXTENSIONS)
     static bool IsExtensionInList(const char *list, const char *extension);
 
+#if wxUSE_PALETTE
+    // create default palette if we're not using RGBA mode
+    // (not supported in most ports)
+    virtual wxPalette CreateDefaultPalette() { return wxNullPalette; }
+
     wxPalette m_palette;
+#endif // wxUSE_PALETTE
 
 #if WXWIN_COMPATIBILITY_2_8
     wxGLContext *m_glContext;

src/gtk/glcanvas.cpp

@@ -203,9 +203,12 @@ bool wxGLCanvas::Create(wxWindow *parent,
                         long style,
                         const wxString& name,
                         const int *attribList,
-                        const wxPalette& WXUNUSED_UNLESS_DEBUG(palette))
+                        const wxPalette& palette)
 {
+#if wxUSE_PALETTE
     wxASSERT_MSG( !palette.IsOk(), wxT("palettes not supported") );
+#endif // wxUSE_PALETTE
+    wxUnusedVar(palette); // Unused when wxDEBUG_LEVEL==0
 
     m_exposed = false;
     m_noExpose = true;