https://bugs.openldap.org/show_bug.cgi?id=9916
--- Comment #14 from jrt...@jrtc27.com ---
#define mp_lower mp_pb.pb.pb_lower
#define mp_upper mp_pb.pb.pb_upper
#define mp_pages mp_pb.pb_pages
union {
struct {
indx_t pb_lower; /**< lower
bound of free space */
indx_t pb_upper; /**< upper
bound of free space */
} pb;
uint32_t pb_pages; /**< number of overflow pages
*/
} mp_pb;
That alone means the struct must be uint32_t aligned otherwise you have UB. It
is perfectly legal therefore for GCC to optimise the two loads to a single
wider load. In fact, struct MDB_page even has a pointer in it inside mp_p so it
needs to be pointer-aligned, i.e. 64-bit-aligned, to not have UB.
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