jeroen opened a new issue, #39068:
URL: https://github.com/apache/arrow/issues/39068
### Describe the enhancement requested
When building the R package on MacOS it automatically downloads static
libarrow builds based on the local host arch:
-
https://nightlies.apache.org/arrow/r/libarrow/bin/darwin-arm64-openssl-1.1/
-
https://nightlies.apache.org/arrow/r/libarrow/bin/darwin-x86_64-openssl-1.1/
However the host arch is sometimes different from the target, for example
when we build on an M1 machine targeting intel using `clang -arch x86_64` or
the other way around. Posit even compiles their `darwin-arm64` binaries on
`linux-arm64`.
Furthermore, R might support universal packages soon that get compiled for
both architectures.
It would be safer to merge static libs for arm64 and x86_64 into a single
universal ("fat") static library that the R package can download without any
guessing of the target arch. You can merge static libs easily using lipo, e.g:
```sh
lipo -create libarrow-arm64.a libarrow-x86_64.a -output libarrow-universal.a
```
This way you can publish a universal static libarrow that will work both
when targeting either arm64 or x86_64, or both.
We also do this for the autobrew libs, and it works very well:
https://github.com/autobrew/bundler
### Component(s)
R
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