1 files changed, 18 insertions, 0 deletions
diff --git a/test/Sema/warn-sizeof-array-decay.c b/test/Sema/warn-sizeof-array-decay.c
new file mode 100644
index 0000000..cc3ee1d
--- /dev/null
+++ b/test/Sema/warn-sizeof-array-decay.c
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+void f(int x) {
+  char foo[10];
+  int bar[20];
+  char qux[30];
+
+  (void)sizeof(bar + 10); // expected-warning{{sizeof on pointer operation will return size of 'int *' instead of 'int [20]'}}
+  (void)sizeof(foo - 20); // expected-warning{{sizeof on pointer operation will return size of 'char *' instead of 'char [10]'}}
+  (void)sizeof(bar - x); // expected-warning{{sizeof on pointer operation will return size of 'int *' instead of 'int [20]'}}
+  (void)sizeof(foo + x); // expected-warning{{sizeof on pointer operation will return size of 'char *' instead of 'char [10]'}}
+
+  // This is ptrdiff_t.
+  (void)sizeof(foo - qux); // no-warning
+
+  (void)sizeof(foo, x); // no-warning
+  (void)sizeof(x, foo); // expected-warning{{sizeof on pointer operation will return size of 'char *' instead of 'char [10]'}}
+}