1 files changed, 23 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/c99-const-expr-12.c b/gcc/testsuite/gcc.dg/c99-const-expr-12.c
new file mode 100644
index 000000000..396cea51a
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/c99-const-expr-12.c
@@ -0,0 +1,23 @@
+/* Test for constant expressions: VLA size constraints.  */
+/* Origin: Joseph Myers <joseph@codesourcery.com> */
+/* { dg-do compile } */
+/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
+
+void
+f (int m)
+{
+  /* An array size that is a constant expression, not just an integer
+     constant expression, must be checked for being positive, but only
+     an integer constant expression makes it not a VLA (which affects
+     certain compatibility checks, in particular).  */
+  int a1[0]; /* { dg-error "zero" } */
+  int a2[-1]; /* { dg-error "negative" } */
+  int a3[(int)(double)0.0]; /* { dg-error "zero" } */
+  int a4[(int)-1.0]; /* { dg-error "negative" } */
+  int a5[(int)+1.0];
+  int a6[(int)+2.0];
+  void *p = (m ? &a5 : &a6);
+  int a7[(int)1.0];
+  int a8[(int)2.0];
+  void *q = (m ? &a7 : &a8); /* { dg-error "pointer type mismatch in conditional expression" } */
+}