http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51628
incrediball <peter at axium dot co.nz> changed:
What |Removed |Added
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CC| |peter at axium dot co.nz
--- Comment #15 from incrediball <peter at axium dot co.nz> 2013-04-02 00:58:40
UTC ---
I believe the discussion here is missing the point. Currently (at least with
version 4.5 and ARM, which I am currently using) the situation is that the
compiler generates broken code WITHOUT COMMENT when the address of something
like an integer in a packed structure is assigned to a int* . Since the pointer
type does not provide any information about the actual alignment of the
integer, it is obviously impractical to fix when accessing the integer and we
certainly do not want to have extra code inserted for handling the possibility
that the int may not be aligned correctly. Therefore the compiler MUST see this
as a type conflict and at least warn that the address of the member in a packed
struct is incompatible with the pointer type.
I have several projects which require the use of packed structures and I simply
cannot rule out that that I have not at some point accidentally assigned the
address of a member variable to a pointer. It would therefore be very handy if
the compiler could point this out. -Wcast-align certainly doesn't do this.
