[llvm-dev] A libc in LLVM

[Siva Chandra via llvm-dev]

On Mon, Jul 15, 2019 at 11:47 AM Aaron Ballman <aaron at aaronballman.com> wrote:
>
> On Mon, Jul 15, 2019 at 2:43 PM Siva Chandra <sivachandra at google.com> wrote:
> >
> > > On 7/15/19 1:22 PM, Aaron Ballman via llvm-dev wrote:
> > > > On Mon, Jul 15, 2019 at 1:02 PM Siva Chandra <sivachandra at google.com> wrote:
> > > >> On Fri, Jul 12, 2019 at 8:32 AM Aaron Ballman <aaron at aaronballman.com> wrote:
> > > >>>> llvm-libc is an implementation of the C standard library targeting C11
> > > >>>> and above.
> > > >>> Any particular reason for C11 as opposed to C17?
> > > >> Two reasons:
> > > >> 1. The C++17 standard refers to the C11 standard.
> > > > This is somewhat confusing to me. That's a reason to support *at
> > > > least* C11. It doesn't seem like a reason to not support the latest C
> > > > standard.
> >
> > I think there is some misunderstanding here. My first message said
> > llvm-libc will target C11 __and above__. Which is to imply that the
> > lower bound of supported standards is C11.
> >
> >
> > On Mon, Jul 15, 2019 at 11:31 AM Finkel, Hal J. <hfinkel at anl.gov> wrote:
> > > +1. Aiming for C17 seems better than aiming for only C11.
> >
> > I interpreted Aaron Ballman's first question as, "why is the lower
> > bound C11 and not C17?" I answered that by saying C++17 standard still
> > refers to C11 standard, so we need to keep C11 as a lower bound.
> >
> > Unless there is some technicality of the language and/or standards
> > which I am not aware of, I did not intend to convey that we do not
> > intend to support latest C standards.
> >
> > Are you saying that the lower bound of standards llvm-libc should
> > support ought to be C17?
>
> Yes, I'm sorry if I was unclear. I think that there's not much purpose
> to supporting C11 as the lower bound given that C17's standard library
> is C11's standard library, but with bug fixes. There were no new
> features added during C17.

OK, point taken. We might have to say something like this in the
charter, "llvm-libc ... targetting C17 (which essentially C11 + bug
fixes) and above."