Bug#1011479: fstrcmp: reproducible-builds: embedded build paths

[Vagrant Cascadian]

Source: fstrcmp
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 debug symbols:

  https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/diffoscope-results/fstrcmp.html

  ./usr/lib/debug/usr/bin/fstrcmp

  0»      (line_strp)»   (offset:·0x0):·/build/1st/fstrcmp-0.7.D001
  vs.
  0»      (line_strp)»   (offset:·0xf):·/build/2/fstrcmp-0.7.D001/2nd

The attached patch fixes this by setting -ffile-prefix-map in CFLAGS in
debian/rules, which avoids embedding the absolute build path.


Alternately, switching to use a newer debhelper compat level and the dh
build system would likely also fix this, as it includes -ffile-prefix-map
by default.


With this patch applied, fstrcmp should build reproducibly on
tests.reproducible-builds.org!


live well,
  vagrant
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