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

From: Jelle Licht
Subject: bug#29522: rustc-1.16.0 broken after jemalloc updated to 5.0.1
Date: Mon, 4 Dec 2017 01:01:29 +0100

2017-11-30 23:41 GMT+01:00 Adam Van Ymeren <address@hidden>:
I haven't had time to dig in to this further, but in case anyone wants
to fix rustc-1.16.0, it's broken after the upgrade of jemalloc to 5.0.1.

Reverting commit 475b99fa5cf402430aa93a40e406e854ad2ff6e4 which reverts
jemalloc back to 4.5.0 causes rustc to build successfully again.  It has
been broken for some time.


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.

[0]: https://github.com/rust-lang/rust/issues/43586
[1]: https://gist.github.com/marmistrz/a6e503a5491df80a493030e0a0e702d2

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