Hi, I have question regarding the

platform

option when building

pex_binary

as mentioned in the documentation. Does this mean if I build a

.pex

on macos and copy it to a docker whose base image which isn't mac, then I need to also build explicitly

.pex

compatible with the base docker image? https://www.pantsbuild.org/docs/reference-pex_binary#codeplatformscode

Yes, that’s right. So when building on mac, you may need something like

platforms=['linux-x86_64-cp-38-cp38']

on the

pex_binary

target.

How do I ensure this? Do I manually need to build it myself?

There must be built wheels available for all of the foreign platforms, rather than sdists.

I think you need to build those yourself, yes.. from what I’ve overheard 😉

Yikes! This seems like bit of work 😞

indeed, so building the pex itself in a container would solve that problem..

yeah multi-stage build or something. This means I have to copy much more stuff in the beginning

there are plans for supporting “remote” execution in containers.. but that’s way off into 2022…

Yeah, it can be a pain to get prebuilt wheels for the

platform

. Sometimes you get lucky that every single transitive dep already releases wheels for you. Often you have to either somehow prune those deps or more realistically prebuild them

a manual workaround -- i have base docker image where i volume mount the repo and the host docker daemon into it and then run the build from there, this allows me to build from mac