Re: [Minios-devel] libc on Mini-OS

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Wed, Sep 30, 2015 at 09:53:29AM +0100, Ian Campbell wrote:
> On Tue, 2015-09-29 at 22:12 -0400, Carl Patenaude Poulin wrote:
> > Hi all,
> > 
> > We're still on a quest to get Rust programs to compile on Mini-OS.
> > Right now, we need a libc to sandwich between the two. As far as we
> > know, Mini-OS only works well with Newlib and Rust only works well
> > with glibc. There's also the option of musl.
> > 
> > We'd be the happiest if we could make glibc work on Mini-OS, but
> > we've seen points to this being very hard to accomplish. Instead,
> > I've been trying to get a "Hello world!" Newlib/Mini-OS app to
> > compile, based on a tutorial from 2006 on the subject[1].
> > Unfortunately, that resource seems hopelessly antiquated, so I
> > figured I'd ask the experts :)
> > 
> > I have several questions:
> > 1. Have there been any efforts around getting glibc to run on Mini
> > OS? Is there documentation on the subject?
> > 2. Similarly, what's the status of Newlib on Mini-OS? How do you
> > suggest we tackle that?
> > 3. Which libc do you think we should go with?
> 
> My answer to all three of these would be to suggest that you investigate
> rumpkernels (rumpkernels.org) which provides a BSD libc environment (which
> is more POSIX than newlib by far and should therefore be easier to get Rust
> working on). When targeting Xen rumpkernels uses mini-os for the lower
> levels and achieves similar aims in a much more pleasant and accessible
> way.
> 
> Does rust run on native NetBSD? If so then that removes one big hurdle.
> Googling seems to suggest there have been some efforts in this direction
> but I'm not clear if they are "done".
> 
> I would imagine that the rust maintainers would be more accepting of
> patches which make rust usable on NetBSD than they might be of newlib or
> some other even more niche libc, which means rust-on-rumpkernels would have
> less to maintain themselves.
> 

Someone make rust run on rump kernel (rumprun unikernel, to be precise).

Announcement email was sent three days ago.

https://www.freelists.org/post/rumpkernel-users/Rust-on-Rumprun

Some links from the announcement email.

[1] https://github.com/rust-lang/rust/pull/28593
[2] https://github.com/rumpkernel/rumprun-packages/tree/master/rust
[3] 
https://www.freelists.org/post/rumpkernel-users/multibake-improvement-with-symbol-collisions
[4] https://gandro.github.io/2015/09/27/rust-on-rumprun/


Wei.

> (my actual answer to 1a and 1b would be "No" and to 2 would be "moribund")
> 
> > 4. How does the Mini-OS build system create a Xen-appropriate ELF
> > file without the use of a cross-compiler? Most resources I've found
> > recommend the use of a cross-compiler, but nothing of the sort seems
> > to be happening here.
> 
> mini-os uses the native compiler with various options to stop it linking
> against system libraries.
> 
> AIUI Rump-kernels use wrappers which look just like cross compilers
> (although under the hood I think they might do something similar to raw
> mini-os)
> 
> Ian.
> 
> 
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