Notes for freefem++ - reproducible builds result

Version annotated: 3.47+dfsg1-1
Identified issues:
Identifier: records_build_flags
Description Records $CFLAGS, which vary intentionally due to the «-fdebug-prefix-map=${BUILDPATH}=.»,
«-ffile-prefix-map=${BUILDPATH}=.» or «-fmacro-prefix-map=${BUILDPATH}=.» flags.
.
We have a patch pending to GCC to fix this issue centrally:
.
https://gcc.gnu.org/ml/gcc-patches/2016-11/msg00182.html
.
Though the patch is currently unlikely to be merged. If/when this
is accepted, this issue should be fixed for all packages and you
should not need to fix it specifically in your package.
.
There is also a work-in-progress patch to dpkg that could address this issue:
.
https://bugs.debian.org/985553
.
For more background information see:
.
• https://alioth-lists.debian.net/pipermail/reproducible-builds/Week-of-Mon-20160822/006788.html
• https://alioth-lists.debian.net/pipermail/reproducible-builds/Week-of-Mon-20160905/006984.html
• https://alioth-lists.debian.net/pipermail/reproducible-builds/Week-of-Mon-20160912/007076.html
Comments: Embeds the build path via dirname of $0
https://sources.debian.net/src/freefem%2B%2B/3.47%2Bdfsg1-1/examples%2B%2B-load/ff-pkg-download.in/?hl=44#L27
https://sources.debian.net/src/freefem%2B%2B/3.47%2Bdfsg1-1/examples%2B%2B-load/ff-pkg-download.in/?hl=88
.
Also captures build path in load.link manpage (include flags / debug path)
 

Our notes about issues affecting packages are stored in notes.git and are targeted at packages in Debian in 'unstable/amd64' (unless they say otherwise).