bug#29522: rustc-1.16.0 broken after jemalloc updated to 5.0.1

[Adam Van Ymeren <adam@vany.ca>]

ludo@gnu.org (Ludovic Courtès) writes:

> Adam Van Ymeren <adam@vany.ca> skribis:
>
>> ludo@gnu.org (Ludovic Courtès) writes:
>>
>>> Hi,
>>>
>>> Jelle Licht <jlicht@fsfe.org> skribis:
>
> [...]
>
>>>> It seems that the bundled copy of jemalloc in the rustc repo is currently
>>>> pinned at 4.5.0 partially
>>>> because of this specific issue as well.
>>>>
>>>> I did find an issue on the rust GH repo [0], and it seems this also affects
>>>> the nix-rust project,
>>>> who seem to have the same errors as our currently failing build [1].
>>>>
>>>> A temporary workaround could be to have a custom version of jemalloc with
>>>> the c++ features disabled
>>>> by building with `--disable-cxx'. Alternatively, we could just make use of
>>>> jemalloc 4.5.0 for rustc only
>>>> until this is all sorted our by upstream.
>>>
>>> Using a --disable-cxx variant of the latest jemalloc sounds preferable
>>> to me over running an old jemalloc.
>>
>> I feel like if rust is pegged at jemalloc 4.5.0 then that's what we
>> should be feeding it.  The changelog suggestst that jemalloc 5 has some
>> pretty significant changes, changing rust to use that theoretically lead
>> to some subtle bugs, I feel like I'd rather wait for upstream to make
>> the upgrade themselves.
>
> Right, that makes sense.
>
> In that case, we should reintroduce jemalloc 4.5 and use that in Rust.

Sounds good, I have a patch that does this and also bumps rust to latest
upstream, but the build is taking forever.  Will post once I've built it
successfully.

>
> Ludo’.