Building recompiles bootloader every build, resulting in extreme build times

[BigBadE]

Following the docs and making a simple project, a basic OS takes over 2 minutes to compile.

How to replicate:

• Pull BigBadE/RustOS@3bb0491 (simple project, or just follow the tutorial for making one)
• Follow setup and run cargo run once to pull dependencies
• Build again with no changes, and compilation will take 2-4 minutes, always freezing on bootloader

Looking around Cargo issues, it looks like this issue has been reported a few times in the past (rust-lang/cargo#1162, rust-lang/cargo#1714, gimli-rs/cpp_demangle#79), but I didn't find any relevant reported issues. This build time makes running/testing extremely difficult.

[BigBadE]

Adding onto this:

• Cloning bootloader and depending on it locally doesn't have this issue.
• Using latest bootloader and bootloader_api.

[phil-opp]

Thanks for reporting! I pushed a fix to #286, which should solve this. Could you try again with the v0.11.0-beta.4 release?

[BigBadE]

Confirmed fixed in beta.4