Make sizeof and __alignof work correctly with packed structs.

llvm-svn: 47202

1 files changed, 37 insertions, 0 deletions

diff --git a/clang/test/Sema/struct-packed-align.c b/clang/test/Sema/struct-packed-align.c
new file mode 100644
index 00000000000..23885a54614
--- /dev/null
+++ b/clang/test/Sema/struct-packed-align.c
@@ -0,0 +1,37 @@
+// RUN: clang %s -fsyntax-only -verify
+
+struct s {
+    char a;
+    int b  __attribute__((packed));
+    char c;
+    int d;
+};
+
+struct __attribute__((packed)) packed_s {
+    char a;
+    int b  __attribute__((packed));
+    char c;
+    int d;
+};
+
+struct fas {
+    char a;
+    int b[];
+};
+
+struct __attribute__((packed)) packed_fas {
+    char a;
+    int b[];
+};
+
+extern int a1[sizeof(struct s) == 12 ? 1 : -1];
+extern int a2[__alignof(struct s) == 4 ? 1 : -1];
+
+extern int b1[sizeof(struct packed_s) == 10 ? 1 : -1];
+extern int b2[__alignof(struct packed_s) == 1 ? 1 : -1];
+
+extern int c1[sizeof(struct fas) == 4 ? 1 : -1];
+extern int c2[__alignof(struct fas) == 4 ? 1 : -1];
+
+extern int d1[sizeof(struct packed_fas) == 1 ? 1 : -1];
+extern int d2[__alignof(struct packed_fas) == 1 ? 1 : -1];