http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53016
Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
--- Comment #3 from Richard Earnshaw <rearnsha at gcc dot gnu.org> 2012-04-17
14:37:13 UTC ---
child_t is a struct that requires 32-bit alignment, so the compiler is entitled
to assume that any pointer to an object containing a child_t will be correctly
aligned. The line:
const parent_t* parentptr = (const parent_t*)(data + 1);
violates that assumption, so your code has undefined behaviour. In this case
that turns out to be an alignment fault at run-time.
