16/01/2020 19:49, Neil Horman: > On Thu, Jan 16, 2020 at 03:20:48PM +0100, Thomas Monjalon wrote: > > 16/01/2020 12:52, Neil Horman: > > > On Wed, Jan 15, 2020 at 01:38:17PM +0100, Thomas Monjalon wrote: > > > > 15/01/2020 12:33, Neil Horman: > > > > > On Wed, Jan 15, 2020 at 12:19:30AM +0100, Thomas Monjalon wrote: > > > > > > 20/12/2019 17:20, Kinsella, Ray: > > > > > > > From: Richardson, Bruce <bruce.richard...@intel.com> > > > > > > > > From: David Marchand <david.march...@redhat.com> > > > > > > > > > +Checking ABI compatibility > > > > > > > > > +-------------------------- > > > > > > > > > + > > > > > > > > > +The first thing is to build reference binaries for the latest > > > > > > > > release > > > > > > > > > +your patches are built on top of. > > > > > > > > > + > > > > > > > > > +Either you are in a git tree and an easy way to identify > > > > > > > > > this is to > > > > > > > > run:: > > > > > > > > > + > > > > > > > > > + git checkout $(git describe --abbrev=0) > > > > > > > > > + > > > > > > > > > +Or you use a tarball and you extract the sources in a > > > > > > > > > director of > > > > > > > > > +your > > > > > > > > > choice. > > > > > > > > > + > > > > > > > > > +Next is building those sources, refer to the previous > > > > > > > > > paragraph. > > > > > > > > > +You can set ``DPDK_BUILD_TEST_DIR=reference``, so that the > > > > > > > > > builds > > > > > > > > > +occur in this directory. > > > > > > > > > + > > > > > > > > > +Finally, the ABI dump files are generated with the > > > > > > > > > +``devtools/gen-abi-reference.sh`` script. This script will > > > > > > > > > look for > > > > > > > > > +builds in the current sub directory ``reference``. But you > > > > > > > > > can set > > > > > > > > > +the environment variable ``DPDK_ABI_REF_BUILD_DIR`` to a > > > > > > > > > different > > > > > > > > location. > > > > > > > > > + > > > > > > > > > +Once done, you can check your current binaries ABI with this > > > > > > > > > +reference with the ``devtools/check-abi-reference.sh`` > > > > > > > > > script. > > > > > > > > > > > > > > > > > > > > > > > > > I still very much dislike forcing the user to generate his own > > > > > > > > reference version to compare the ABI against. These should be > > > > > > > > archived > > > > > > > > and the user should just be able to pull them down via git or > > > > > > > > http or > > > > > > > > otherwise. Two reasons for this: > > > > > > > > > > > > > > > > 1. Less error prone, since there is no chance of the user > > > > > > > > having an > > > > > > > > incorrect build for whatever reason. > > > > > > > > > > > > > > > > 2. Less effort for the user than asking them to do extra > > > > > > > > builds. The > > > > > > > > more steps the user has to follow, the less likely they are to > > > > > > > > attempt > > > > > > > > the process. > > > > > > > > > > > > > > +1 ... 100% agree with this. > > > > > > > > > > > > > > Many people won't know or understand what the reference is, > > > > > > > or why they to generate it. > > > > > > > > > > > > I don't want to generate and save the reference in git for each > > > > > > arch. > > > > > > > > > > > Can I ask what your reluctance is? Is it related to not wanting to > > > > > have to save > > > > > all this information that is otherwise not used for building purposes? > > > > > > > > Yes I prefer keeping only the sources in the repository. > > > > And these dumps are big. > > > > And last but not the least, there is no ready-to-use environment to > > > > build > > > > and dump all libs for all archs. > > > > > > > > > If so I might suggest saving the dumps in a separate git tree and > > > > > pulling them > > > > > in as a git submodule when the check is performed > > > > > > > > > > I really like the idea of caching the results so everyone is working > > > > > from a > > > > > known ABI baseline. > > > > > > > > You don't trust the result of the build made from tagged sources? > > > > > > > I trust the result from the tools, sure, its trusting that people will > > > take the > > > extra time to build a version from a prior tag that I'm less sure of. > > > Consistent use in my mind is predicated on ease and timeliness of use. > > > > > > I get not wanting to store large dumps in the source tree, but storage is > > > cheap, > > > and I don't see the issue with storing the xml dump in a separate git > > > tree to be > > > referenced through a git submodule that gets pulled in when the check is > > > run. > > > > Yes this is an option. > > My fear is that this reference database will not be complete > > if we don't build it for all libraries/drivers on all archs, > > managing setups and dependencies. > > > I can understand that, but I would have assumed that we would have done all > config build for all supported arches as part of the CI for a release, from > which we could archive the results. Is that not the case?
No, we don't have a fully complete setup covering all dependencies and archs.
