I didn't find any information about alignment requirements for statically allocated objects in GCC and x86-64 manual (or I have missed because the manual is huge). I noted that sometimes variables such as int are not aligned on word boundary in x86 and x86_64 but I have never seen a struct that wouldn't be allocated at address that isn't a multiple or 4/8. I am asking this question because I would like to know whether it's safe to assume that struct will be always assigned at a word boundary and therefore it's possible to correctly calculate a struct size without running a program. This question was first asked here https://sourceware.org/ml/libc-help/2015-08/msg00015.html but I was told to ask it on GCC ml. -- <wempwer@xxxxxxxxx>
