[Bug libc/16197] CMSG_DATA results in (possibly correct) string aliasing warnings on gcc

["luto at mit dot edu" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16197

--- Comment #2 from Andy Lutomirski <luto at mit dot edu> ---
I suspect that glibc's code is fine, insofar programs using it aren't invoking
undefined behavior.  That being said, I'm not sure I can blame gcc for warning.
 glibc is doing something roughly equivalent to:

struct foo { unsigned char array[10]; };

void func(struct foo *foo)
{
   int x = *(int*)foo->array;
}

There's no actual aliasing violation there (the object is of type int, not
char), but the code sure *looks* like an aliasing violation.

Given that the other variant is already there in bits/socket.h, it seems to me
that glibc should just switch to using it and eliminate the warning.

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