vnc: avoid deprecation warnings for SASL on OS X

Apple has deprecated sasl.h functions in OS X 10.11.  Therefore,
all files that use SASL API need to disable -Wdeprecated-declarations.
Remove the only use that is outside vnc-auth-sasl.c and add the
relevant #pragma GCC diagnostic there.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210604120915.286195-1-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

ui/vnc-auth-sasl.c

@@ -28,10 +28,30 @@
 #include "vnc.h"
 #include "trace.h"
 
+/*
+ * Apple has deprecated sasl.h functions in OS X 10.11.  Therefore,
+ * files that use SASL API need to disable -Wdeprecated-declarations.
+ */
+#ifdef CONFIG_DARWIN
+#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
+#endif
+
 /* Max amount of data we send/recv for SASL steps to prevent DOS */
 #define SASL_DATA_MAX_LEN (1024 * 1024)
 
 
+bool vnc_sasl_server_init(Error **errp)
+{
+    int saslErr = sasl_server_init(NULL, "qemu");
+
+    if (saslErr != SASL_OK) {
+        error_setg(errp, "Failed to initialize SASL auth: %s",
+                   sasl_errstring(saslErr, NULL, NULL));
+        return false;
+    }
+    return true;
+}
+
 void vnc_sasl_client_cleanup(VncState *vs)
 {
     if (vs->sasl.conn) {

ui/vnc-auth-sasl.h

@@ -63,6 +63,7 @@ struct VncDisplaySASL {
     char *authzid;
 };
 
+bool vnc_sasl_server_init(Error **errp);
 void vnc_sasl_client_cleanup(VncState *vs);
 
 size_t vnc_client_read_sasl(VncState *vs);

ui/vnc.c

@@ -4154,14 +4154,8 @@ void vnc_display_open(const char *id, Error **errp)
     trace_vnc_auth_init(vd, 1, vd->ws_auth, vd->ws_subauth);
 
 #ifdef CONFIG_VNC_SASL
-    if (sasl) {
-        int saslErr = sasl_server_init(NULL, "qemu");
-
-        if (saslErr != SASL_OK) {
-            error_setg(errp, "Failed to initialize SASL auth: %s",
-                       sasl_errstring(saslErr, NULL, NULL));
-            goto fail;
-        }
+    if (sasl && !vnc_sasl_server_init(errp)) {
+        goto fail;
     }
 #endif
     vd->lock_key_sync = lock_key_sync;