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macros: do not use more type safe CONTAINEROF version if not requested

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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@redhat.com>
Acked-by: Christophe Fergeau <cfergeau@redhat.com>
This commit is contained in:
Frediano Ziglio 2016-03-02 11:25:09 +00:00
parent 4707655962
commit 0721716bb8
1 changed files with 6 additions and 1 deletions
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7
spice/macros.h
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@ -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))); })