Change build directory

[MGlolenstine]

I'm loving rust-analyzer so far, but there's a problem I'm facing.
I'm compiling for armv7, and whenever I want to build, I have to rebuild the whole package, because cargo check rebuilds all dependencies for x86_64 (I think, because it doesn't have to rebuild everything when the extension is disabled).

Now I'd like to know if there's a way to change the build directory, just so that I could use both programs and not have to wait 5min between deploys.

[bjorn3]

When building for a different target, cargo should use a different build directory. (eg target/<target triple>/debug instead of target/debug)

[lnicola]

Are you setting any rustc or cargo flags using environment variables? That might explain why cargo is rebuilding crates if your editor doesn't inherit the same ones. Does it happen if you build from the Code terminal? We've had another report of this, but I can't really look it up right now.

[lnicola]

#3270

[MGlolenstine]

I'm compiling using cross build --target=armv7-unknown-linux-gnueabihf, and I did try changing the --target-dir, by adding it to RustAnalyzer > Cargo-watch: Arguments in the rust-analyzer settings to another folder inside the project folder, I also tried an absolute path, but neither worked.

[MGlolenstine]

So if I understand correctly from this, there's currently no way to replace the path, that the default Rust analyzer: run uses for the cargo check -p <projectname>? If I run it manually with the --target-dir <abs path to tmp folder> it doesn't interfere at all.

[davemilter]

@bjorn3

When building for a different target, cargo should use a different build directory

There is cargo bug: rust-lang/cargo#7822 and rust-lang/cargo#6375 ,
so cargo check cargo check --target= can influence each other, though artifact go to different directories.

[lnicola]

@MGlolenstine are you still seeing this? If yes, can you please put up a sample project where you see cargo rebuilding too much?

[MGlolenstine]

I haven't worked on that project since the last time we spoke, but I will take a look and report.

[kaimast]

I still see this problem. More details are in rust-lang/cargo#8716.