dx build recompiles everything every time when using a cargo workspace

[ochrons]

Problem

When having a Dioxus fullstack app as part of cargo workspace, running dx build always recompiles everything. The same doesn't happen with dx serve though.

Steps To Reproduce

Create a new Rust project using cargo workspace.
Add a Dioxus fullstack project as a workspace member.
Run dx build in the fullstack project dir.
Run it again.

Expected behavior

It should not recompile anything, when nothing is changed.

This problem does not happen when having a standalone Dioxus fullstack or desktop app that is not part of a workspace.

Environment:

• Dioxus version: 0.5.1 (CLI version 0.5.4)
• Rust version: 1.76
• OS info: Win11 WSL2 Ubuntu 22.04
• App platform: fullstack

[hampuslidin]

I can reproduce this everytime on a non-workspace project as well:

1. Run dx new.
2. Select Fullstack.
3. Give it any project name.
4. Choose either true or false for using the Dioxus router.
5. Choose Vanilla CSS.
6. Go into the project directory.
7. Run dx build --platform fullstack.
8. Run dx build --platform fullstack again and observe it being recompiled.

dioxus-cli version: 0.5.4

[jkelleyrtp]

This is due to 1) how we handle rustflags for optimizations and 2) where we place out artifacts for parallel builds - this should be mostly fixed when we move to profiles instead of implicit rustargs #2780