Are you sure that's a bug in the legalistic sense? IIRC, C and C++ don't promise any particular memory layout for structs. On Wed, Jun 2, 2010 at 11:53 AM, David R. Doucette <ddoucette@xxxxxxxxxxxxxxxx> wrote: > We just installed Lucid Lynx a few days ago, and have hit a fatal flaw with > g++ that has forced us to stop the deployment and roll back the systems we > could. > > Structures in Lucid are now mapping differently than in the past, so we can > no longer read our own files! Further, if any files are written by code > produced by the new g++, they are corrupted. > > The problem is that doubles are now being mapped onto a boundary divisible > by 8 rather than a boundary divisible by 4, meaning that offsets change and > structs get bigger. > > I've attached a tar file showing the mapping on Jaunty, Karmic, and Lucid to > show the change. This is a greatly simplified program that shows the > problem, but it's happening in all of our C++ programs. > > HELP! > > System is Ubuntu 10.4 Lucid Lynx 64 bit. > > David Doucette >
