Use bzip2 pure rust mode?

[NobodyXu]

trifectatechfoundation/bzip2-rs#40 (comment)

bzip2 has added a new feature, to opt in to use libbz2-rs-sys, a pure-rust implementation created by calling c2rust on the original C codebase.

This results in a pure-rust implementation that is:

• easier to cross compile
• No external c compiler needs to be installed
• No build-script or build-script dependencies
• pure rust implementation of bzip2 can be LTO against rust code, without having to configure the system to use the same clang version to compile

To use it, we need to disable default features to avoid pulling in bzip2-sys and then enable the new feature

[NobodyXu]

Alternatively, bzip2 can be updated to disable bzip2-sys vendor building whenever the rust backend is enabled.

I will try submit a patch and see if they are willing to take it.

[NobodyXu]

Opened trifectatechfoundation/bzip2-rs#125