Notes for freefem++ - reproducible builds result

Version annotated: 3.47+dfsg1-1
Identified issues:
Identifier: captures_build_path
Description Captures build path, e.g., /build/1st/foo-42.0 v. /build/foo-42.0/2nd
Currently we vary the build path only when testing packages from unstable
and experimental, for stretch we recommend that rebuilds are done in the
same path as the original build.
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This issue is only for miscellaneous issues which need individual fixes,
please create new issues for specific issues, e.g. gcc_captures_build_path.
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Here follows some general tips for packages using the standard GNU toolchain:
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If using autoconf, make sure you call ./configure via a relative and not absolute path.
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If your issue is related to using the `__FILE__` macro, or the recording of
--debug-prefix-map flags in non-GCC non-debugging output, this is what is
fixed by our patch mentioned above; you should not need to fix it
specifically in your package.
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For more background information see:
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• https://lists.alioth.debian.org/pipermail/reproducible-builds/Week-of-Mon-20160822/006788.html
• https://lists.alioth.debian.org/pipermail/reproducible-builds/Week-of-Mon-20160905/006984.html
• https://lists.alioth.debian.org/pipermail/reproducible-builds/Week-of-Mon-20160912/007076.html
Identifier: records_build_flags
Description Records $CFLAGS, which vary intentionally due to the «-fdebug-prefix-map=${BIKESHED}=.» flag.
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We have a patch pending to GCC to fix this issue centrally:
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https://gcc.gnu.org/ml/gcc-patches/2016-11/msg00182.html
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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.
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For more background information see:
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• https://lists.alioth.debian.org/pipermail/reproducible-builds/Week-of-Mon-20160822/006788.html
• https://lists.alioth.debian.org/pipermail/reproducible-builds/Week-of-Mon-20160905/006984.html
• https://lists.alioth.debian.org/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
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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).