rustc/debian

Document by Luca Bruno & Sylvestre Ledru

This source package is unfortunately quite tricky and with
several cutting edges, due to the complexity of rust-lang
bootstrapping system and the high rate of language changes
still ongoing.

We try to describe here inner packaging details and the
reasons behind them.


Embedded libraries
==================

This source package embeds several external libraries (foeked and managed
by rust upstream as git submodules).
In early stages, many more libraries were forked/emebedded but we are steadily
progressing in splitting them out.

Here below the remaining ones, with the technical reasons.

 * jemalloc from https://github.com/rust-lang/jemalloc
   -> system-wide one can't be used due to rust using a "je_" prefix.

   This is intentional upstream design and won't change soon, see:
    - https://github.com/rust-lang/rust/pull/18678
    - http://smallcultfollowing.com/babysteps/blog/2014/11/14/allocators-in-rust/

 * compiler-rt from https://github.com/rust-lang/compiler-rt
   -> system-wide compiler-rt fails during linkage

   Bug reported upstream, still to be fixed, see:
    - https://github.com/rust-lang/rust/issues/15054
    - https://github.com/rust-lang/rust/issues/15708

As a summary, we plan to:
 * keep embedding jemalloc (probably forever)
 * work with upstream to fix compiler-rt linkage soon.

 -- Sylvestre Ledru <sylvestre@debian.org>  Fri, 27 Mar 2015 14:27:12 +0100