On Mon, Dec 02, 2019 at 01:53:09PM +0100, Jan Hubicka wrote:
> > > It would be great to convert libstdc++ to the new infrastructure so it
> > > becomes LTO safe and gives some real world testing to this
> > > infrastructure. I tried that but found it is bit non-trivial since
> > > currently way we need to attach the attribute to definition itself,
> > > while current .symver output is done in separate C++ files.
What is the reason for this limitation? I think that is pretty severe.
Wouldn't it be enough to accept symver attribute on any declaration, but at
the end verify that declarations that have that attribute have the
definition in the current TU?
I mean, it is fairly common to:
void foo ()
{
...
}
asm (".symver ...");
where the foo definition comes from one source and symver from another one,
which includes the first source.
So, the corresponding new rewrite for that might be:
void foo ()
{
...
}
extern __typeof (foo) foo __attribute__((symver ("bar@@BAZ")));
Jakub
