1 files changed, 26 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/c99-const-expr-9.c b/gcc/testsuite/gcc.dg/c99-const-expr-9.c
new file mode 100644
index 0000000..48f43ed
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/c99-const-expr-9.c
@@ -0,0 +1,26 @@
+/* Test for constant expressions: __builtin_offsetof allowed in
+   integer constant expressions but not traditional offsetof
+   expansion.  */
+/* Origin: Joseph Myers <joseph@codesourcery.com> */
+/* { dg-do compile } */
+/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
+
+struct s {
+  int a;
+};
+
+struct t {
+  struct s a;
+  int b[2];
+};
+
+#define old_offsetof(TYPE, MEMBER) ((__SIZE_TYPE__) &((TYPE *)0)->MEMBER)
+
+enum e {
+  E1 = old_offsetof (struct s, a), /* { dg-error "constant" } */
+  E2 = old_offsetof (struct t, a.a), /* { dg-error "constant" } */
+  E3 = old_offsetof (struct t, b[1]), /* { dg-error "constant" } */
+  E4 = __builtin_offsetof (struct s, a),
+  E5 = __builtin_offsetof (struct t, a.a),
+  E6 = __builtin_offsetof (struct t, b[1])
+};