On Tue, Aug 18, 2015 at 5:50 PM, Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> wrote: > On Tue, Aug 18, 2015 at 05:04:28PM +0200, john smith wrote: >> In gcc manual it says: >> >> "Note that the alignment of any given struct or union type is required >> by the ISO C standard to be at least a perfect multiple of the lowest >> common multiple of the alignments of all of the members of the struct >> or union in question." >> >> Where exactly is this requirement mentioned in C standard? I was >> looking for it in both C99 and C11 drafts and couldn't find it. > > C99 6.7.2.1/12 ? It just says that "Each non-bit-field member of a structure or union object is aligned in an implementation-defined manner appropriate to its type.". It doesn't require an overall alignment of the structure to be "at least a perfect multiple of the lowest common multiple of the alignments of all of the members of the struct". -- <wempwer@xxxxxxxxx>
