Added compile time detection of the XKB X11 extension.

CMakeLists.txt

@@ -74,6 +74,10 @@ if (UNIX AND NOT APPLE AND NOT CYGWIN)
         list(APPEND GLFW_LIBRARIES ${X11_XF86VIDMODE_LIBRARIES})
     endif(X11_XF86VIDMODE_FOUND) 
 
+    # Check for Xkb (X keyboard extension)
+    CHECK_FUNCTION_EXISTS(XkbQueryExtension _GLFW_HAS_XKB)
+
+    # Check for glXGetProcAddress
     CHECK_FUNCTION_EXISTS(glXGetProcAddress _GLFW_HAS_GLXGETPROCADDRESS)
 
     if (NOT _GLFW_HAS_GLXGETPROCADDRESS)

src/config.h.in

@@ -40,6 +40,9 @@
 // Define this to 1 if Xf86VidMode is available
 #cmakedefine _GLFW_HAS_XF86VIDMODE 1
 
+// Define this to 1 if Xkb is available
+#cmakedefine _GLFW_HAS_XKB         1
+
 // Define this to 1 if glXGetProcAddress is available
 #cmakedefine _GLFW_HAS_GLXGETPROCADDRESS    1
 // Define this to 1 if glXGetProcAddressARB is available

src/x11/platform.h

@@ -67,8 +67,9 @@
 #endif
 
 // The Xkb extension provides improved keyboard support
+#if defined(_GLFW_HAS_XKB)
  #include <X11/XKBlib.h>
-
+#endif
 
 #ifndef GL_VERSION_3_0
 
@@ -183,9 +184,11 @@ typedef struct _GLFWlibraryX11
         int         errorBase;
         int         majorVersion;
         int         minorVersion;
-        int         keyCodeLUT[256];
     } Xkb;
 
+    // Key code LUT (mapping X11 key codes to GLFW key codes)
+    int         keyCodeLUT[256];
+
     // Screensaver data
     struct {
         GLboolean   changed;

src/x11/x11_init.c

@@ -68,16 +68,20 @@ static void initLibraries(void)
 
 static void updateKeyCodeLUT(void)
 {
-    int i, keyCode, keyCodeGLFW;
+#if defined(_GLFW_HAS_XKB)
+    int keyCode, keyCodeGLFW;
     char name[XkbKeyNameLength+1];
     XkbDescPtr descr;
+#endif
+    int i;
 
     // Clear the LUT
     for (i = 0; i < 256; ++i)
     {
-        _glfwLibrary.X11.Xkb.keyCodeLUT[i] = -1;
+        _glfwLibrary.X11.keyCodeLUT[i] = -1;
     }
 
+#if defined(_GLFW_HAS_XKB)
     // This functionality requires the Xkb extension
     if (!_glfwLibrary.X11.Xkb.available)
     {
@@ -154,12 +158,13 @@ static void updateKeyCodeLUT(void)
         // Update the key code LUT
         if ((keyCode >= 0) && (keyCode < 256))
         {
-            _glfwLibrary.X11.Xkb.keyCodeLUT[keyCode] = keyCodeGLFW;
+            _glfwLibrary.X11.keyCodeLUT[keyCode] = keyCodeGLFW;
         }
     }
 
     // Free the keyboard description
     XkbFreeKeyboard(descr, 0, True);
+#endif /* _GLFW_HAS_XKB */
 }
 
 
@@ -228,6 +233,7 @@ static GLboolean initDisplay(void)
     }
 
     // Check if Xkb is supported on this display
+#if defined(_GLFW_HAS_XKB)
     _glfwLibrary.X11.Xkb.majorVersion = 1;
     _glfwLibrary.X11.Xkb.minorVersion = 0;
     _glfwLibrary.X11.Xkb.available =
@@ -237,6 +243,9 @@ static GLboolean initDisplay(void)
                           &_glfwLibrary.X11.Xkb.errorBase,
                           &_glfwLibrary.X11.Xkb.majorVersion,
                           &_glfwLibrary.X11.Xkb.minorVersion);
+#else
+    _glfwLibrary.X11.Xkb.available = GL_FALSE;
+#endif /* _GLFW_HAS_XKB */
 
     // Update the key code LUT
     // FIXME: We should listen to XkbMapNotify events to track changes to

src/x11/x11_window.c

@@ -335,7 +335,7 @@ static int translateKey(int keycode)
     // a positive result if we have the Xkb extension.
     if ((keycode >= 0) && (keycode < 256))
     {
-        int result = _glfwLibrary.X11.Xkb.keyCodeLUT[keycode];
+        int result = _glfwLibrary.X11.keyCodeLUT[keycode];
         if (result >= 0)
         {
             return result;