[Bug c/109956] GCC reserves 9 bytes for struct s { int a; char b; char t[]; } x = {1, 2, 3};

[muecker at gwdg dot de via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109956

--- Comment #9 from Martin Uecker <muecker at gwdg dot de> ---
Clang as well, but that would be only padding inside the first part without
taking into account extra element in the FAM. 

I am more concert about programmers using the formula sizeof(.) + n * sizeof
for memcpy etc.  (and we have an example in the standard using this formula).
Creating objects smaller than this seems a bit dangerous.