Add new macro QEMU_PACKED for packed C structures

A packed struct needs different gcc attributes for compilations
with MinGW compilers because glib-2.0 adds compiler flag
-mms-bitfields which modifies the packing algorithm.

Attribute gcc_struct reverses the negative effects of -mms-bitfields.
QEMU_PACKED sets this attribute and must be used for any packed
struct which is affected by -mms-bitfields.

Signed-off-by: Stefan Weil <[email protected]>
Signed-off-by: Blue Swirl <[email protected]>

diff --git a/compiler.h b/compiler.h
index 9af5dc6c91dc7315559449589d3209488c07e2f5..a2d5959e4b86e539313b37e82c7bb8d75b6dc00e 100644 (file)
--- a/compiler.h
+++ b/compiler.h
@@ -12,6 +12,12 @@
 #define QEMU_WARN_UNUSED_RESULT
 #endif
 
+#if defined(_WIN32)
+# define QEMU_PACKED __attribute__((gcc_struct, packed))
+#else
+# define QEMU_PACKED __attribute__((packed))
+#endif
+
 #define QEMU_BUILD_BUG_ON(x) \
     typedef char qemu_build_bug_on__##__LINE__[(x)?-1:1];