smyrna: squash -Wunused-parameter warnings for GLUT callbacks

These functions need to conform to a particular type signature.

diff --git a/cmd/smyrna/glutrender.c b/cmd/smyrna/glutrender.c
index 5c758ad0c238d1833840c4ff36c70fb21dba19c7..941f3babccbfd0d264a74a56606efc8ebebe3477 100644 (file)
--- a/cmd/smyrna/glutrender.c
+++ b/cmd/smyrna/glutrender.c
@@ -151,6 +151,9 @@ static void cb_drag(int X, int Y)
 
 static void cb_keyboard(unsigned char key, int x, int y)
 {
+    (void)x;
+    (void)y;
+
     if (key==27)    /*ESC*/
        graphviz_exit(1);
     if(key=='3')
@@ -172,12 +175,17 @@ static void cb_keyboard(unsigned char key, int x, int y)
 static void cb_keyboard_up(unsigned char key, int x, int y)
 {
     (void)key;
+    (void)x;
+    (void)y;
 
     appmouse_key_release(view);
 }
 
 static void cb_special_key(int key, int x, int y)
 {
+    (void)x;
+    (void)y;
+
     if(key==GLUT_KEY_F1)
     {
        printf("Currently help is not available\n");
@@ -188,6 +196,9 @@ static void cb_special_key(int key, int x, int y)
 
 static void cb_special_key_up(int key, int x, int y)
 {
+    (void)x;
+    (void)y;
+
     if(key==GLUT_KEY_F1)
     {
        printf("Currently help is not available\n");