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)