Bug#1033959: binutils: reproducible builds: build paths embedded in debug symbols

[Vagrant Cascadian]

Source: binutils
Severity: normal
Tags: patch
User: reproducible-builds at lists.alioth.debian.org
Usertags: buildpath
X-Debbugs-Cc: reproducible-bugs at lists.alioth.debian.org

The build path is embedded in debugging symbols:

  https://tests.reproducible-builds.org/debian/rb-pkg/unstable/armhf/diffoscope-results/binutils.html

  /usr/lib/debug/.dwz/arm-linux-gnueabihf/binutils-arm-linux-gnueabihf.debug

  /build/1st/binutils-2.40/builddir-single/binutils
  vs.
  /build/2/binutils-2.40/2nd/builddir-single/binutils

The attached patch to debian/rules fixes this by passing the
-ffile-prefix-map in CFLAGS and CXXFLAGS, which strips the build path
from occurences of __FILE__ and in debug symbols.

Unfortunately, this patch alone does not solve all reproducibility
issues, but applying this patch should significantly reduce the
differences, making it easier to debug remaining issues.


Thanks for maintaining binutils!


live well,
  vagrant
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