1 files changed, 41 insertions, 0 deletions
diff --git a/test/Sema/warn-cast-align.c b/test/Sema/warn-cast-align.c
new file mode 100644
index 0000000..11e3c41
--- /dev/null
+++ b/test/Sema/warn-cast-align.c
@@ -0,0 +1,41 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fsyntax-only -Wcast-align -verify %s
+
+// Simple casts.
+void test0(char *P) {
+  char *a  = (char*)  P;
+  short *b = (short*) P; // expected-warning {{cast from 'char *' to 'short *' increases required alignment from 1 to 2}}
+  int *c   = (int*)   P; // expected-warning {{cast from 'char *' to 'int *' increases required alignment from 1 to 4}}
+}
+
+// Casts from void* are a special case.
+void test1(void *P) {
+  char *a  = (char*)  P;
+  short *b = (short*) P;
+  int *c   = (int*)   P;
+
+  const volatile void *P2 = P;
+  char *d  = (char*)  P2;
+  short *e = (short*) P2;
+  int *f   = (int*)   P2;
+
+  const char *g  = (const char*)  P2;
+  const short *h = (const short*) P2;
+  const int *i   = (const int*)   P2;
+
+  const volatile char *j  = (const volatile char*)  P2;
+  const volatile short *k = (const volatile short*) P2;
+  const volatile int *l   = (const volatile int*)   P2;
+}
+
+// Aligned struct.
+__attribute__((align(16))) struct A {
+  char buffer[16];
+};
+void test2(char *P) {
+  struct A *a = (struct A*) P; // expected-warning {{cast from 'char *' to 'struct A *' increases required alignment from 1 to 16}}
+}
+
+// Incomplete type.
+void test3(char *P) {
+  struct B *b = (struct B*) P;
+}