Allow to compress binaries with UPX

[mondeja]

Add upx option to compress binaries with UPX on Windows and Linux (see https://upx.github.io).
Contributes to #6

[taiki-e]

Thanks for the PR! Could you add a test for this option?

[mondeja]

Added to CI in c7c5a13

[taiki-e]

• Is the reason it doesn't work with aarch64 and windows-gnu because UPX doesn't support cross-compilation?
  (It seems that aarch64 is supported? https://github.com/upx/upx/blob/d00ba4b4656837c08841bd8f9599fda87bb7c7d2/src/p_lx_elf.h#L533)
• Is it intentional that this is only tested in linux? Have there been any problems when tested otherwise?

[mondeja]

See https://github.com/taiki-e/upload-rust-binary-action/actions/runs/12377523218/

Is the reason it doesn't work with aarch64 and windows-gnu because UPX doesn't support cross-compilation?

See https://github.com/taiki-e/upload-rust-binary-action/actions/runs/12377523218/job/34547228299?pr=90#step:6:296

Is it intentional that this is only tested in linux? Have there been any problems when tested otherwise?

• win64/arm64 is not yet supported
• macOS is not supported

[taiki-e]

Is the reason it doesn't work with aarch64 and windows-gnu because UPX doesn't support cross-compilation?

See https://github.com/taiki-e/upload-rust-binary-action/actions/runs/12377523218/job/34547228299?pr=90#step:6:296

It seems to work with aarch64 linux-gnu + build-tool=cargo.
https://github.com/taiki-e/upload-rust-binary-action/actions/runs/12377523218/job/34547228655?pr=90

Is it intentional that this is only tested in linux? Have there been any problems when tested otherwise?

• win64/arm64 is not yet supported
• macOS is not supported

This doesn't seem to describe why x86_64 windows is skipped.
https://github.com/taiki-e/upload-rust-binary-action/actions/runs/12377523218/job/34547233333?pr=90

[mondeja]

It seems to work with aarch64 linux-gnu + build-tool=cargo.

Added.

This doesn't seem to describe why x86_64 windows is skipped.

The output of the file command is the same when the exe is compressed with UPX or not:

./test-crate/target/release/test-crate.exe: PE32+ executable (console) x86-64 (stripped to external PDB), for MS Windows

See this run (compressing) and this run (not compressing). I don't know how to test it.

[taiki-e]

cc @damooo (who requested UPX support in #54)

[ahaoboy]

UPX appears to greatly reduce the program size. I'm really looking forward to using it!

[ahaoboy]

Hi @taiki-e
I'd really appreciate it if this PR could be moved forward and merged. I'm currently working on some Rust programs that run on OpenWRT, where storage space is extremely limited—typically around 30MB of available space. UPX has been tested and can reduce binary sizes by 30% to 60%, which is a huge improvement in such constrained environments. If there's any issue with this PR or if you need help addressing them, I'm happy to assist!