1 files changed, 35 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/gcc.dg/c99-const-expr-14.c b/gcc-4.9/gcc/testsuite/gcc.dg/c99-const-expr-14.c
new file mode 100644
index 000000000..0c4f1b69b
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/gcc.dg/c99-const-expr-14.c
@@ -0,0 +1,35 @@
+/* Test for constant expressions: cases involving VLAs, at file scope.  */
+/* Origin: Joseph Myers <joseph@codesourcery.com> */
+/* { dg-do compile } */
+/* { dg-options "-std=iso9899:1999 -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];
+
+volatile int nv;
+int m;
+int n;
+int f (int, int);
+
+static int (*a2)[] = (int (*)[n])sa;
+static int (*a8)[] = (int (*)[(m=n)])sa; /* { dg-error "constant" } */
+static int (*a9)[] = (int (*)[(m+=n)])sa; /* { dg-error "constant" } */
+static int (*a10)[] = (int (*)[f(m,n)])sa; /* { dg-error "constant" } */
+static int (*a11)[] = (int (*)[(m,n)])sa; /* { dg-error "constant" } */
+static int (*a12)[] = (int (*)[sizeof(int[n])])sa;
+static int (*a13)[] = (int (*)[sizeof(int[m++])])sa; /* { dg-error "constant" } */
+static int (*a15)[] = (int (*)[sizeof(*(int (*)[n])sa)])sa;
+static int (*a16)[] = (int (*)[sizeof(*(int (*)[m++])sa)])sa; /* { dg-error "constant" } */
+static int (*a17)[] = (int (*)[nv])sa;