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+/* Test for types of conditional expressions. */
+/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
+/* { dg-do compile } */
+/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
+
+/* Notes:
+
+ (a) The rules are the same in both C standard versions, but C99 also
+ gives us the "restrict" qualifier to play with.
+
+ (b) Within the C standard, the value of a conditional expression can't
+ have qualified type - but nor can this be detected. Because of GCC's
+ extended lvalues, the value may in GCC have qualified type if the
+ arguments do. So don't use the following macro with arguments of
+ qualified type.
+
+*/
+
+/* Assertion that the type of a conditional expression between E1 and E2
+ is T. Checks the expression both ways round. */
+#define ASSERT_COND_TYPE(E1, E2, T) \
+ do { \
+ typedef T type; \
+ typedef type **typepp; \
+ typedef __typeof(0 ? (E1) : (E2)) ctype; \
+ typedef __typeof(0 ? (E2) : (E1)) ctype2; \
+ typedef ctype **ctypepp; \
+ typedef ctype2 **ctype2pp; \
+ typepp x = 0; \
+ ctypepp y = 0; \
+ ctype2pp z = 0; \
+ x = y; \
+ x = z; \
+ } while (0)
+
+void
+foo (void)
+{
+ const void *c_vp;
+ void *vp;
+ const int *c_ip;
+ volatile int *v_ip;
+ int *ip;
+ const char *c_cp;
+ int *restrict *r_ipp;
+ typedef void (*fpt)(void);
+ fpt fp;
+ signed char sc;
+ struct s { int p; } st;
+ union u { int p; } un;
+ /* Arithmetic type. */
+ ASSERT_COND_TYPE (sc, sc, int);
+ /* Structure and union. */
+ ASSERT_COND_TYPE (st, st, struct s);
+ ASSERT_COND_TYPE (un, un, union u);
+ /* Void. */
+ ASSERT_COND_TYPE ((void)0, (void)1, void);
+ /* Pointers: examples from 6.5.15 paragraph 8. */
+ ASSERT_COND_TYPE (c_vp, c_ip, const void *);
+ ASSERT_COND_TYPE (v_ip, 0, volatile int *);
+ ASSERT_COND_TYPE (c_ip, v_ip, const volatile int *);
+ ASSERT_COND_TYPE (vp, c_cp, const void *);
+ ASSERT_COND_TYPE (ip, c_ip, const int *);
+ ASSERT_COND_TYPE (vp, ip, void *);
+ /* Null pointer constants. */
+ ASSERT_COND_TYPE (v_ip, (void *)0, volatile int *);
+ ASSERT_COND_TYPE (r_ipp, (void *)0, int *restrict *);
+ ASSERT_COND_TYPE (fp, 0, fpt);
+ ASSERT_COND_TYPE (fp, (void *)0, fpt);
+}