feat: allow calling offsetof() in compile-time expression

1 files changed, 23 insertions, 0 deletions

diff --git a/tests/stddef.c b/tests/stddef.c
new file mode 100644
index 0000000..f63e57c
--- /dev/null
+++ b/tests/stddef.c
@@ -0,0 +1,23 @@
+#include <helpers.h>
+#include <stddef.h>
+
+struct S {
+    int x;
+    int y;
+};
+struct T {
+    char a;
+    int b;
+    char c;
+};
+
+int main() {
+    ASSERT_EQ(0, offsetof(struct S, x));
+    ASSERT_EQ(4, offsetof(struct S, y));
+    ASSERT_EQ(0, offsetof(struct T, a));
+    ASSERT_EQ(4, offsetof(struct T, b));
+    ASSERT_EQ(8, offsetof(struct T, c));
+
+    char buf[offsetof(struct T, b)];
+    ASSERT_EQ(4, sizeof(buf));
+}