[Bug middle-end/66661] incorrect memory access in optimization with flexible array member

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66661

--- Comment #14 from joseph at codesourcery dot com <joseph at codesourcery dot 
com> ---
That wording is long including several examples.  You can see it in 
http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf subclause 
6.7.2.1 (C99 + TC1 + TC2 + TC3).