On Thu, Apr 22, 2021 at 08:05:27AM +0000, David Laight wrote: > > (Does anyone - and by anyone I mean any large distro - compile with > > local variables inited by the compiler?) > > There are compilers that initialise locals to zero for 'debug' builds > and leave the 'random' for optimised 'release' builds. > Lets not test what we are releasing! Yeah, that's the worst of all possible worlds. > I also think there is a new option to gcc (or clang?) to initialise > on-stack structures and arrays to ensure garbage isn't passed. > That seems to be a horrid performance hit! > Especially in userspace where large stack allocations are almost free. > > Any auto-initialise ought to be with a semi-random value > (especially not zero) so that it is never right and doesn't > lead to lazy coding. Many compilers did something like this, decades ago -- for debug builds. Segher
