https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69560
--- Comment #4 from David Merillat <david.merillat at gmail dot com> --- (In reply to Jonathan Wakely from comment #2) > See ADJUST_FIELD_ALIGN at > https://gcc.gnu.org/onlinedocs/gccint/Storage-Layout.html#Storage-Layout > > unsigned long long on x86 is such a type. Thank you for the pointers into GCC internals, of which I was unaware. However, the C++14 specification makes no mention of weaker alignment requirements for structure members that I could find. In fact, the specification for alignof() in C++14 is remarkably similar to that of _Alignof in C11 (I would assume one is derived from the other. _Alignof yields what I believe to be the correct answer in this case: ######################################################## test2.c #include <stdio.h> #include <stdalign.h> #include <stdint.h> int main(void) { printf( "_Alignof(int64_t) = %d\n", _Alignof(int64_t) ); return 0; } ########################################################## gcc -std=C11 test2.c -o test2 -m32 ########################################################## _Alignof(int64_t) = 4 ##########################################################
