[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

[John Paul Adrian Glaubitz]

Hello!

With the attached patch, I can almost fully build rustc 1.29 natively on mips,
but it fails again with an out-of-memory error while generating the Rustbook:

Rustbook (mips-unknown-linux-gnu) - unstable-book
running: "/home/glaubitz/rustc/rustc-1.29.0+dfsg1/build/mips-unknown-linux-gnu/stage0-tools-bin/rustbook" "build"
"/home/glaubitz/rustc/rustc-1.29.0+dfsg1/build/mips-unknown-linux-gnu/md-doc/unstable-book" "-d"
"/home/glaubitz/rustc/rustc-1.29.0+dfsg1/build/mips-unknown-linux-gnu/doc/unstable-book"
memory allocation of 1342177280 bytes failed

command did not execute successfully: "/home/glaubitz/rustc/rustc-1.29.0+dfsg1/build/mips-unknown-linux-gnu/stage0-tools-bin/rustbook" "build"
"/home/glaubitz/rustc/rustc-1.29.0+dfsg1/build/mips-unknown-linux-gnu/md-doc/unstable-book" "-d"
"/home/glaubitz/rustc/rustc-1.29.0+dfsg1/build/mips-unknown-linux-gnu/doc/unstable-book"
expected success, got: signal: 6


Traceback (most recent call last):
  File "./x.py", line 20, in <module>
    bootstrap.main()
  File "/home/glaubitz/rustc/rustc-1.29.0+dfsg1/src/bootstrap/bootstrap.py", line 842, in main
    bootstrap(help_triggered)
  File "/home/glaubitz/rustc/rustc-1.29.0+dfsg1/src/bootstrap/bootstrap.py", line 833, in bootstrap
    run(args, env=env, verbose=build.verbose)
  File "/home/glaubitz/rustc/rustc-1.29.0+dfsg1/src/bootstrap/bootstrap.py", line 149, in run
    raise RuntimeError(err)
RuntimeError: failed to run: /home/glaubitz/rustc/rustc-1.29.0+dfsg1/build/bootstrap/debug/bootstrap install --config debian/config.toml -vv --on-fail env
make[1]: *** [debian/rules:271: override_dh_auto_install] Error 1
make[1]: Leaving directory '/home/glaubitz/rustc/rustc-1.29.0+dfsg1'
make: *** [debian/rules:132: binary-arch] Error 2
dpkg-buildpackage: error: fakeroot debian/rules binary-arch subprocess returned exit status 2

I also disabled the debug symbols for stdlib on mips/mipsel (same as for 32-bit ARM):

        [ $(DEB_BUILD_ARCH) != mips -a \
          $(DEB_BUILD_ARCH) != mipsel ] || sed -i -e '/^debuginfo-only-std = /d' "$@"

So, if we move the generation of the Rustbook into the binary-indep target (which
we should do anyway, shouldn't we), then rustc should build fine on 32-bit MIPS.

Note: We still need this one patch for LLVM backported to fix the atomics issue
      otherwise the testsuite will hang.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz at debian.org
`. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913
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