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| 12:47.26 | abelloni | khem: I know you have somehow been playing with compilers, did you try to get oe to generate a baremetal aarch64 toolchain? |
| 12:47.51 | abelloni | it seems that insane.bbclass has to be patched |
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| 20:12.03 | lamby | Hello. I see on http://www.openembedded.org/wiki/Features that you have reproducible builds. How are you achieving that? |
| 20:14.58 | bluelightning | lamby: they aren't reproducible in the "exact binaries" sense |
| 20:15.39 | fray | reproducible as in using the same input we get the same output within a reasonable way.. date stamps, embedded (build) paths, etc may change.. |
| 20:15.53 | fray | but you can do binary diffs on product executables and they are the same (otherwise) |
| 20:16.00 | bluelightning | but since we are building the cross compiler & toolchain, and a good portion of the native tools, there's less chance of anything external leaking in |
| 20:16.15 | fray | you can compare build logs, etc and show (other then those items) they are the same from one build to the next (with the same config/input) |
| 20:16.17 | bluelightning | (that would change the output in a material way) |
| 20:16.41 | JaMa | lamby: check https://bugzilla.yoctoproject.org/show_bug.cgi?id=5866 |
| 20:17.51 | JaMa | it would be great to fix at least the issues which cause binary size differences |
| 20:18.16 | JaMa | then it will be easier to spot the bigger differences in e.g. files-in-image.txt reports |
| 20:18.24 | lamby | Thanks :) |
| 20:18.36 | lamby | (I work on https://reproducible-builds.org/ in general) |
| 20:19.13 | lamby | (Where we use reproducible in the exact binary sense. Silly terminologyâ¦) |
| 20:26.08 | rburton | lamby: there are efforts to be proper reproducible, and we have magic to strip exact source paths from eg debug info to reduce the delta |
| 20:26.43 | rburton | -fdebug-prefix-map etc |
| 20:27.26 | rburton | in theory OE would be a good way to experiment with reproducible, as we always build our own gcc and forcibly control every compiler flag |
| 20:27.37 | rburton | just need someone with motivation |
| 20:32.18 | lamby | re. -fdebug-prefix-map, have you seen https://gcc.gnu.org/ml/gcc-patches/2016-11/msg00182.html ? |
| 20:33.17 | rburton | curl in being a bit stupid shocker |
| 20:33.41 | lamby | It's nowhere near just curl :) |
| 20:34.19 | rburton | well, we're mainly using it to stop embedding build paths in binaries so blatently |
| 20:34.42 | rburton | if the paths are relative to the target prefix you can relocate them trivially to a local sysroot |
| 20:39.08 | rburton | gotta go, if you want to talk about this more then both me and RP are interested (and in the UK) |
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| 20:45.11 | lamby | :) |
| 20:47.12 | RP | lamby: I'm the RP who just asked about the Yocto Project getting involved in reproducible builds |
| 20:48.21 | RP | lamby: we've been working at this in our own way for a while but happy to work with others. We actually want to go one step further than some of what you want to do as we want the binaries to be identical regardless of the path we build them in for example |
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| 20:58.09 | lamby | RP: hey :) |
| 20:58.31 | lamby | RP: Just to correct you there (:p), we want the binaries to be identical regardless of the path⦠|
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| 21:29.16 | RP | lamby: hmm, that wasn't what I inferred from your website |
| 21:29.44 | RP | lamby: I struggle for time as I juggle many things but I do want to find a way to work together on some of this |
| 21:40.35 | lamby | RP: If so, it's likely out of date. In the Debian Reproducible Builds team we temporarily fixed the build path, but we now don't do that. This could be source of the confusion. |
| 21:40.56 | lamby | If you are interested, please join #debian-reproducible and/or #reproducible-builds on OFTC. |
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