Fix the argument index error of __builtin___memccpy_chk

memccpy_check should have source and dest size at arg 3 and 4
rdar://18431336

llvm-svn: 218367

1 files changed, 9 insertions, 0 deletions

diff --git a/clang/test/Sema/builtin-object-size.c b/clang/test/Sema/builtin-object-size.c
index e4b65608816..b1bda0652c1 100644
--- a/clang/test/Sema/builtin-object-size.c
+++ b/clang/test/Sema/builtin-object-size.c
@@ -43,3 +43,12 @@ void f5(void)
   memcpy((char *)NULL + 0x10000, buf, 0x10);
   memcpy1((char *)NULL + 0x10000, buf, 0x10); // expected-error {{argument should be a value from 0 to 3}}
 }
+
+// rdar://18431336
+void f6(void)
+{
+  char b[5];
+  char buf[10];
+  __builtin___memccpy_chk (buf, b, '\0', sizeof(b), __builtin_object_size (buf, 0));
+  __builtin___memccpy_chk (b, buf, '\0', sizeof(buf), __builtin_object_size (b, 0));  // expected-warning {{'__builtin___memccpy_chk' will always overflow destination buffer}}
+}