Adding option to explicitly specify build directory

[lukgni]

Description

mbed-tools configure stores target specifc configuration (.mbedbuild/) in a project dir - this can't be overridden with different path. It is a little bit inconvenient, especially in situation when we want to use single project directory to work with multiple HW targets (or with tests on multiple HW in CI/CD).

Maybe we could add a new option to mbed-tool configure | mbed-tool compile commands, which would explicitly specify build directory where .mbedbuild will be created (something similar to -B flag from cmake >3.19)

For example:

mbed-tools configure -B <build_directory> ...
cmake  -B <build_directory> ...
cmake --build <build_directory>

or

mbed-tools compile -B <build_directory> ...

[ladislas]

It's something I need as well.

@Patater @rwalton-arm unless you guys are already working on that, I'm willing to make a PR.

let me know. :)

[Patater]

@ladislas We aren't working on this currently, but would appreciate a PR for it. Thanks!

[boraozgen]

Any updates on this?