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

From: Adam Van Ymeren
Subject: bug#29522: rustc-1.16.0 broken after jemalloc updated to 5.0.1
Date: Mon, 04 Dec 2017 14:35:07 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux)

address@hidden (Ludovic Courtès) writes:

> Adam Van Ymeren <address@hidden> skribis:
>> address@hidden (Ludovic Courtès) writes:
>>> Hi,
>>> Jelle Licht <address@hidden> 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

> Ludo’.

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