fix some strict aliasing problems related to choosing framebuffer configs (Matthias Hopf)

src/glut/glx/glut_dstr.c

@@ -1530,11 +1530,7 @@ main(int argc, char **argv)
   char *str, buffer[1024];
   int tty = isatty(fileno(stdin));
   int overlay = 0, showconfig = 0;
-#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_fbconfig)
-  GLXFBConfigSGIX fbc;
-#else
   void *fbc;
-#endif
 
 #if !defined(_WIN32)
   dpy = XOpenDisplay(NULL);
@@ -1563,10 +1559,10 @@ main(int argc, char **argv)
       } else {
         if (overlay) {
           vinfo = getVisualInfoFromString(str, &treatAsSingle,
-            requiredOverlayCriteria, numRequiredOverlayCriteria, requiredOverlayCriteriaMask, (void**) &fbc);
+            requiredOverlayCriteria, numRequiredOverlayCriteria, requiredOverlayCriteriaMask, &fbc);
         } else {
           vinfo = getVisualInfoFromString(str, &treatAsSingle,
-            requiredWindowCriteria, numRequiredWindowCriteria, requiredWindowCriteriaMask, (void**) &fbc);
+            requiredWindowCriteria, numRequiredWindowCriteria, requiredWindowCriteriaMask, &fbc);
         }
         if (vinfo) {
           printf("\n");

src/glut/glx/glut_overlay.c

@@ -362,11 +362,7 @@ glutEstablishOverlay(void)
   GLUToverlay *overlay;
   GLUTwindow *window;
   XSetWindowAttributes wa;
-#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_fbconfig)
-  GLXFBConfigSGIX fbc;
-#else
   void *fbc;
-#endif
 
   /* Register a routine to free an overlay with glut_win.c;
      this keeps glut_win.c from pulling in all of
@@ -389,7 +385,7 @@ glutEstablishOverlay(void)
     __glutFatalError("out of memory.");
 
   overlay->vis = determineOverlayVisual(&overlay->treatAsSingle,
-    &overlay->visAlloced, (void **) &fbc);
+    &overlay->visAlloced, &fbc);
   if (!overlay->vis) {
     __glutFatalError("lacks overlay support.");
   }

src/glut/glx/glut_win.c

@@ -30,7 +30,7 @@ GLUTwindow *__glutMenuWindow = NULL;
 
 void (*__glutFreeOverlayFunc) (GLUToverlay *);
 XVisualInfo *(*__glutDetermineVisualFromString) (char *string, Bool * treatAsSingle,
-  Criterion * requiredCriteria, int nRequired, int requiredMask, void** fbc) = NULL;
+  Criterion * requiredCriteria, int nRequired, int requiredMask, void **fbc) = NULL;
 
 static Criterion requiredWindowCriteria[] =
 {
@@ -471,11 +471,7 @@ __glutCreateWindow(GLUTwindow * parent,
   unsigned long attribMask;
   int winnum;
   int i;
-#if defined(GLX_VERSION_1_1) && defined(GLX_SGIX_fbconfig)
-  GLXFBConfigSGIX fbc;
-#else
   void *fbc;
-#endif
 
 #if defined(_WIN32)
   WNDCLASS wc;
@@ -501,7 +497,7 @@ __glutCreateWindow(GLUTwindow * parent,
 
 #if !defined(_WIN32)
   window->vis = __glutDetermineWindowVisual(&window->treatAsSingle,
-    &window->visAlloced, (void**) &fbc);
+    &window->visAlloced, &fbc);
   if (!window->vis) {
     __glutFatalError(
       "visual with necessary capabilities not found.");