Include the build of Proj.4 inside the Cargo build about transit_model HOT 5 CLOSED

Depending on what else you need, Geo has an Ubuntu Docker image available for use with GH actions with the latest libproj installed. The repo is part of Georust…

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This ticket might be outdated since this kind of solution is likely to be merged soon directly into the crate proj-sys on which crate proj depend.
georust/proj-sys#25

Note however that this would probably increase significantly our CI build, unless the system on which we depend (ubuntu-latest for Github Actions) already have a pre-packaged version of Proj in a compatible version.

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Just to clarify: by default, proj-sys (and proj, by extension) will try to use the existing system libproj (using pkg-config if it's present), and only fall back to the bundled source if it can't be found.

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@urschrei Thanks for the precision and yes, that's what I understood. But most CI runners (Github Actions in the case of transit_model) don't have libproj installed by default. And last time we checked, the libproj packaged in debian-like system was too old to correctly work with the crate proj (so using apt install libproj was not an option). The consequence would have been to recompile libproj on each CI build. That said, we might also be able to use some cache system in the CI... 🤔

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I guess this has not really been a problem anymore in the CI (using custom image with a libproj already installed in it), I'm closing this issue.

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