https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81333
--- Comment #3 from mikulas at artax dot karlin.mff.cuni.cz --- > Only C11 and above. C99 and C98 does not have any requirements like that :) Accessing any variable with the char pointer is allowed in C89 and newer standards. Threading is not covered at all in C89 and C99. See this quote from C89: A.6.2 Undefined behavior: * An object has its stored value accessed by an lvalue that does not have one of the following types: the declared type of the object, a qualified version of the declared type of the object, the signed or unsigned type corresponding to the declared type of the object, the signed or unsigned type corresponding to a qualified version of the declared type of the object, an aggregate or union type that (recursively) includes one of the aforementioned types among its members, or a character type ($3.3).
