This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug c/59852] Support sparse-style __attribute__((bitwise)) (type attribute)
- From: "tromey at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 21 Jan 2014 02:34:47 +0000
- Subject: [Bug c/59852] Support sparse-style __attribute__((bitwise)) (type attribute)
- Auto-submitted: auto-generated
- References: <bug-59852-4 at http dot gcc dot gnu dot org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59852
--- Comment #5 from Tom Tromey <tromey at gcc dot gnu.org> ---
(In reply to Josh Triplett from comment #4)
> Also note that arithmetic operations between a bitwise and a known-zero
> value do not warn.
I'm curious about this too.
If it means that the warnings should be deferred until after
optimization, then it seems like maybe a difficult problem.
On the other extreme, if this just refers to constant expressions,
making this a purely front-end feature, then it seems more tractable.