Make casts lose top-level qualifiers

TODO: also make them lose lvalue status

tccgen.c

@@ -2517,6 +2517,7 @@ static void gen_cast(CType *type)
                   | (lvalue_type(type->ref->type.t) & VT_LVAL_TYPE);
     }
     vtop->type = *type;
+    vtop->type.t &= ~ ( VT_CONSTANT | VT_VOLATILE | VT_ARRAY );
 }
 
 /* return type size as known at compile time. Put alignment at 'a' */

tests/tests2/94_generic.c

@@ -0,0 +1,81 @@
+#include <stdio.h>
+
+const int a = 0;
+
+struct a {
+	int a;
+};
+
+struct b {
+	int a;
+};
+
+int a_f()
+{
+	return 20;
+}
+
+int b_f()
+{
+	return 10;
+}
+
+typedef int (*fptr)(int);
+int foo(int i)
+{
+  return i;
+}
+
+typedef int int_type1;
+
+#define gen_sw(a) _Generic(a, const char *: 1, default: 8, int: 123);
+
+int main()
+{
+	int i = 0;
+	signed long int l = 2;
+	struct b titi;
+	const int * const ptr;
+	const char *ti;
+	int_type1 i2;
+
+	i = _Generic(a, int: a_f, const int: b_f)();
+	printf("%d\n", i);
+	i = _Generic(a, int: a_f() / 2, const int: b_f() / 2);
+	printf("%d\n", i);
+	i = _Generic(ptr, int *:1, int * const:2, default:20);
+	printf("%d\n", i);
+	i = gen_sw(a);
+	printf("%d\n", i);
+	i = _Generic(titi, struct a:1, struct b:2, default:20);
+	printf("%d\n", i);
+	i = _Generic(i2, char: 1, int : 0);
+	printf("%d\n", i);
+	i = _Generic(a, char:1, int[4]:2, default:5);
+	printf("%d\n", i);
+	i = _Generic(17, int :1, int **:2);
+	printf("%d\n", i);
+	i = _Generic(17L, int :1, long :2, long long : 3);
+	printf("%d\n", i);
+	i = _Generic("17, io", char *: 3, const char *: 1);
+	printf("%d\n", i);
+	i = _Generic(ti, const unsigned char *:1, const char *:4, char *:3,
+		     const signed char *:2);
+	printf("%d\n", i);
+	printf("%s\n", _Generic(i + 2L, long: "long", int: "int",
+				long long: "long long"));
+	i = _Generic(l, long: 1, int: 2);
+	printf("%d\n", i);
+	i = _Generic(foo, fptr: 3, int: 4);
+	printf("%d\n", i);
+
+	(void)_Generic((int(*)[2]){0}, int(*)[2]:0, int(*)[4]:0); //shouldn't match twice
+
+	//should accept ({ }) in the controlling expr of _Generic even in const_wanted contexts
+	struct { _Bool x_0: _Generic(({0;}),default:1); } my_x;
+
+	_Generic((__typeof((float const)((float const){42}))*){0}, float*: 0); //casts lose top-level qualifiers
+	int const x = 42; __typeof((__typeof(x))x) *xp = 0; (void)_Generic(xp, int*: 0); //casts lose top-level qualifiers
+
+	return 0;
+}