Andrew Haley wrote:
Yang Zhang wrote:
Ian Lance Taylor wrote:
Yang Zhang <yanghatespam@xxxxxxxxx> writes:
I expected a cast-align warning or something.
If you use -Wcast-align you should get a warning for targets where the
cast increases the required alignment.
Sorry for being unclear. I was trying to say that I had specified
-Wcast-align but got no such warning. Any hints?
`-Wcast-align'
Warn whenever a pointer is cast such that the required alignment
of the target is increased. For example, warn if a `char *' is
cast to an `int *' on machines where integers can only be accessed
at two- or four-byte boundaries.
but on x86 there is no such restriction.
Andrew.
So __alignof__/alignment_of<> have nothing to do with the required
alignment of the type, but have instead to do with the gcc-determined
"default alignment" of the type?
Is there something analogous to __alignof__ that can tell me the
required alignment? (E.g., if I'm serializing data and trying to pack
together everything without padding...)
--
Yang Zhang
http://www.mit.edu/~y_z/
