Don't fail on const/restrict/static/* inside []

This patch makes tcc ignore them.

Normally (as per the C standard), They should
be only applicable inside parameter arrays
and affect (const/restrict) the pointer the
array gets converted to.

[matz: fix formatting, add volatile handling, add testcase,
add comment about above deficiency]

tccgen.c

@@ -4348,8 +4348,23 @@ static int post_type(CType *type, AttributeDef *ad, int storage, int td)
 	int saved_nocode_wanted = nocode_wanted;
         /* array definition */
         next();
-        if (tok == TOK_RESTRICT1)
-            next();
+	while (1) {
+	    /* XXX The optional type-quals and static should only be accepted
+	       in parameter decls.  The '*' as well, and then even only
+	       in prototypes (not function defs).  */
+	    switch (tok) {
+	    case TOK_RESTRICT1: case TOK_RESTRICT2: case TOK_RESTRICT3:
+	    case TOK_CONST1:
+	    case TOK_VOLATILE1:
+	    case TOK_STATIC:
+	    case '*':
+		next();
+		continue;
+	    default:
+		break;
+	    }
+	    break;
+	}
         n = -1;
         t1 = 0;
         if (tok != ']') {

tests/tests2/100_c99array-decls.c

@@ -0,0 +1,34 @@
+void foo(int [5]);
+void fooc(int x[const 5]);
+void foos(int x[static 5]);
+void foov(int x[volatile 5]);
+void foor(int x[restrict 5]);
+void fooc(int [const 5]);
+void foos(int [static 5]);
+void foov(int [volatile 5]);
+void foor(int [restrict 5]);
+void fooc(int (* const x));
+void foos(int *x);
+void foov(int * volatile x);
+void foor(int * restrict x);
+void fooc(int x[volatile 5])
+{
+  x[3] = 42;
+#ifdef INVALID
+  x = 0;
+#endif
+}
+void foovm(int x[const *]);
+void foovm(int * const x);
+#ifdef INVALID
+void wrongc(int x[3][const 4]);
+void wrongvm(int x[static *]);
+void foovm(int x[const *])
+{
+  x[2] = 1;
+}
+#endif
+int main()
+{
+  return 0;
+}