Add __packed__ attribute on drop-in structs

[tinc] / src / have.h

diff --git a/src/have.h b/src/have.h
index 36d17b6..1d1bedf 100644 (file)
--- a/src/have.h
+++ b/src/have.h
@@ -45,6 +45,22 @@
 #include <math.h>
 #include <time.h>
 
+#ifdef HAVE_STATIC_ASSERT
+#define STATIC_ASSERT(expr, msg) _Static_assert((expr), msg)
+#else
+#define STATIC_ASSERT(check, msg)
+#endif
+
+#ifdef HAVE_ATTR_PACKED
+#define PACKED(...) __VA_ARGS__ __attribute__((__packed__))
+#else
+#ifdef _MSC_VER
+#define PACKED(...) __pragma(pack(push, 1)) __VA_ARGS__ __pragma(pack(pop))
+#else
+#warning Your compiler does not support __packed__. Use at your own risk.
+#endif
+#endif
+
 #ifdef HAVE_ALLOCA_H
 #include <alloca.h>
 #elif defined(HAVE_NETBSD)