Warn for braces around a pointer initializer.

src/cc65/initdata.c

@@ -302,6 +302,13 @@ static unsigned ParsePointerInit (const Type* T)
     /* Optional opening brace */
     unsigned BraceCount = OpeningCurlyBraces (0);
 
+    /* We warn if an initializer for a scalar contains braces, because this is
+    ** quite unusual and often a sign for some problem in the input.
+    */
+    if (BraceCount > 0) {
+        Warning ("Braces around scalar initializer");
+    }
+
     /* Expression */
     ExprDesc ED = NoCodeConstExpr (hie1);
     TypeConversion (&ED, T);

test/ref/bug2134.c

@@ -0,0 +1,2 @@
+int i = { 0 };
+char* p = { 0 };

test/ref/bug2134.cref

@@ -0,0 +1,2 @@
+bug2134.c:1: Warning: Braces around scalar initializer
+bug2134.c:2: Warning: Braces around scalar initializer