Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 32 insertions, 0 deletions

diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/gnu99-const-expr-3.c b/gcc-4.9/gcc/testsuite/gcc.dg/gnu99-const-expr-3.c
new file mode 100644
index 000000000..aba7da542
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.dg/gnu99-const-expr-3.c
@@ -0,0 +1,32 @@
+/* Test for constant expressions: cases involving VLAs and typeof.  */
+/* Origin: Joseph Myers <joseph@codesourcery.com> */
+/* { dg-do compile } */
+/* { dg-options "-std=gnu99 -pedantic-errors" } */
+
+/* It appears address constants may contain casts to variably modified
+   types.  Whether they should be permitted was discussed in
+   <http://groups.google.com/group/comp.std.c/msg/923eee5ab690fd98>
+   <LV7g2Vy3ARF$Ew9Q@romana.davros.org>; since static pointers to VLAs
+   are definitely permitted within functions and may be initialized
+   and such initialization involves implicit conversion to a variably
+   modified type, allowing explicit casts seems appropriate.  Thus,
+   GCC allows them as long as the "evaluated" size expressions do not
+   contain the various operators not permitted to be evaluated in a
+   constant expression, and as long as the result is genuinely
+   constant (meaning that pointer arithmetic using the size of the VLA
+   is generally not permitted).  */
+
+static int sa[100];
+
+int
+f (int m, int n)
+{
+  static int (*a1)[n] = &sa;
+  static int (*a2)[n] = (__typeof__(int (*)[n]))sa;
+  static int (*a3)[n] = (__typeof__(int (*)[(int){m++}]))sa; /* { dg-error "constant" } */
+  static int (*a4)[n] = (__typeof__((int (*)[n])sa))sa;
+  static int (*a5)[n] = (__typeof__((int (*)[m++])sa))sa; /* { dg-error "constant" } */
+  static int (*a6)[n] = (__typeof__((int (*)[100])(int (*)[m++])sa))sa;
+  static int (*a7)[n] = (__typeof__((int (*)[n])sa + m++))sa; /* { dg-error "constant" } */
+  return n;
+}