Bug#862113: gcc-6: Generate reproducible output independently of the build path

[Ximin Luo]

Package: gcc-6
Version: 6.3.0-16
Severity: wishlist
Tags: patch upstream
User: reproducible-builds at lists.alioth.debian.org
Usertags: build-path 

Dear Maintainer,

I've been asked to file this bug report so that others working on the
Reproducible Builds project can better track the ongoing issue of
build-path-independent reproducibility in various tools and compilers. I don't
mean to imply to rush this process nor pressure you, this report is only for
informational purposes.

As you know, I've already contacted upstream with a proposed patch:
- https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00513.html

These (backported to GCC-6) may be browsed as git commits here:
- https://anonscm.debian.org/cgit/reproducible/gcc-6.git/log/?h=pu/reproducible_builds

The built packages may be downloaded here:
- https://reproducible.alioth.debian.org/debian/
- https://tests.reproducible-builds.org/debian/index_repositories.html (overview)

The reproducibility status of dependent packages is being tracked on these pages:
- https://tests.reproducible-builds.org/debian/issues/unstable/captures_build_path_issue.html

We're currently waiting to hear back from upstream to see what they think.
However, I don't think the patch is missing any functionality and is unlikely
to negatively affect any other packages.

Ximin

-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable-debug'), (500, 'testing-debug'), (300, 'unstable'), (200, 'experimental'), (1, 'experimental-debug')
Architecture: amd64
 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.9.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages gcc-6 depends on:
ii  binutils      2.28-4
ii  cpp-6         6.3.0-16
ii  gcc-6-base    6.3.0-16
ii  libc6         2.24-10
ii  libcc1-0      6.3.0-16
ii  libgcc-6-dev  6.3.0-16
ii  libgcc1       1:6.3.0-16
ii  libgmp10      2:6.1.2+dfsg-1
ii  libisl15      0.18-1
ii  libmpc3       1.0.3-1+b2
ii  libmpfr4      3.1.5-1
ii  libstdc++6    6.3.0-16
ii  zlib1g        1:1.2.8.dfsg-5

Versions of packages gcc-6 recommends:
ii  libc6-dev  2.24-10

Versions of packages gcc-6 suggests:
ii  gcc-6-doc         6.3.0-1
pn  gcc-6-locales     <none>
ii  gcc-6-multilib    6.3.0-16
pn  libasan3-dbg      <none>
pn  libatomic1-dbg    <none>
pn  libcilkrts5-dbg   <none>
pn  libgcc1-dbg       <none>
pn  libgomp1-dbg      <none>
pn  libitm1-dbg       <none>
pn  liblsan0-dbg      <none>
pn  libmpx2-dbg       <none>
pn  libquadmath0-dbg  <none>
pn  libtsan0-dbg      <none>
pn  libubsan0-dbg     <none>

-- no debconf information