Exclude interrupt vector table from host build (e.g. in a build script)

[summivox]

Background

I was trying to use imxrt-hal in the build script of my firmware crate. This creates a difficulty: I am using the "rt" feature in the firmware crate. When I include imxrt-hal in the build deps, because features are additive, the build script is also linked with the vector table, which now complains about the lack of IRQ handlers.

Solution

I need a way to exclude the vector table from being linked into the build script.
Was going to try target_arch = "arm" and realized that it's possible for the host arch to be "arm" too.

Since the firmware is built with target_os = "none" and the build script is built on a non-bare-metal system, I went with this as the extra filter. It seems to be working.

[mciantyre]

Looks good. I don't see this hurting anyone, so I plan to release in the 0.5 series.

Did you have any luck using feature resolver version 2 to work around this issue? From my understanding, the resolver handles the case when build dependencies and normal dependencies need different builds and features enabled. The dependency / feature declarations might look like this.

[dependencies]
imxrt-ral = { version = "0.5", features = ["${MY_CHIP}"] }

[target.'cfg(all(target_os = "none", target_arch = "arm"))'.dependencies]
imxrt-ral = { version = "0.5", features = ["rt"] }

[build-dependencies]
imxrt-ral = "0.5"

[summivox]

I tried resolver v2; unfortunately it did not work. It's strange because I just read the cargo book section from your link, and according to my impression your setup should work, but nope. Maybe it currently only stops build deps features from added to normal deps, but normal deps features regardless of condition are still added to build deps? /shrug

[mciantyre]

Sorry, I'm not sure either, but thanks for giving it a try and following up.

I released this commit in imxrt-ral 0.5.3.