[Pkg-rust-maintainers] Bug#881845: Bug#881845: Bug#881845: Bug#881845: Bug#881845: Bug#881845: Bug#881845: Bug#881845: Bug#881845: rustc: FTBFS on mips*: test failures

[Aron Xu]

On Wed, Oct 3, 2018 at 5:54 PM John Paul Adrian Glaubitz
<glaubitz at physik.fu-berlin.de> wrote:
>
> On 10/3/18 10:35 AM, Emilio Pozuelo Monfort wrote:
> >> Can you backport the llvm fix to llvm 7?
> >
> > Actually given 7 is not in testing and rust is not using it atm, what would be
> > good is to have this backported to llvm 6 asap, so that we can (hopefully) get
> > rust bootstrapped in mips*, which is blocking quite some stuff.
>
> Even if you fix this particular bug, you are still running into the unfortunate
> situation on the 32-bit MIPS architectures that there is not enough virtual
> address space per process for Rust to work so you will always end up in
> out-of-memory situations when building rustc natively on 32-bit MIPS.
>
> I have done extensive testing and tried lots of different approaches to
> reduce the memory footprint of the Rust compiler, but so far I have
> never succeeded in building rustc natively on 32-bit MIPS.
>

I haven't tried this yet. Wonders if it's doable to build 32bit rustc
natively without debugging symbols (where Debian builds full debug
symbols which consumes a lot of the address space), if that's doable
we can consider adding something like -gsplit-dwarf to rustc to relax
the situation.

Regards,
Aron