On Monday, 3 June 2013 at 23:47:33 UTC, Jonathan M Davis wrote:
1. That'll only affect Windows unless we change the linking
model on *nix
systems.
It is evolving on the C/C++ side, so I see no point in being more
conservative than theses.
2. That'll only affect stuff that isn't exported from a shared
library. There
are plenty of cases where a class is exported from a shared
library, and it
has lots of functions on it which are supposed to be
non-virtual.
Calling into/from a shared lib is doomed to be a performance hit
as the called code is opaque to the compiler anyway. Which mean
assuming the worse on the caller side and disabling most
optimizations.
3. Doesn't doing this require that the _linker_ optimize out
the virtuality of
the functions for you? If that's the case, it won't work any
time soon (if
ever), because we use the C linker, not our own.
I'm not sure what it imply for GCC, but this is actually not hard
to implement in LLVM.
