This prevents incompatibility if users (like old spice-server/spice-gtk)
are not expected to have this additional restriction.
Signed-off-by: Frediano Ziglio <fziglio@xxxxxxxxxx>
---
spice/macros.h | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
Changes since v1:
- macro name;
- added code comment.
diff --git a/spice/macros.h b/spice/macros.h
index 2efbaff..a0413f3 100644
--- a/spice/macros.h
+++ b/spice/macros.h
@@ -143,7 +143,12 @@
((long) ((uint8_t*) &((struct_type*) 0)->member))
#endif
-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
+/* The SPICE_USE_SAFER_CONTAINEROF macro is used to avoid
+ * compilation breakage with older spice-server releases which
+ * triggered some errors without an additional patch.
+ */
+#if defined(__GNUC__) && defined(SPICE_USE_SAFER_CONTAINEROF) && \
+ (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))
#define SPICE_CONTAINEROF(ptr, struct_type, member) ({ \
const typeof( ((struct_type *)0)->member ) *__mptr = (ptr); \
((struct_type *)(void *)((uint8_t *)(__mptr) - SPICE_OFFSETOF(struct_type, member))); })
--
2.5.0
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