Change CMAKE_BINARY_DIR to CMAKE_CURRENT_BINARY_DIR

[ladislas]

Summary of changes

Following comment #14265 (comment), this PR changes the use of CMAKE_BINARY_DIR to CMAKE_CURRENT_BINARY_DIR.

This will put target specific files (.elf, .map, .bin, .hex, etc.) in their respective target directories, like this:

This change paves the way to "multiple target support" in the near future.

Impact of changes

None

Migration actions required

None

Documentation

None

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[x] No Tests required for this change (E.g docs only update)
[] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

@0xc0170 @hugueskamba @rwalton-arm @Patater @rajkan01

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[ciarmcom]

@ladislas, thank you for your changes.
@rajkan01 @0xc0170 @rwalton-arm @Patater @hugueskamba @ARMmbed/mbed-os-tools @ARMmbed/mbed-os-maintainers please review.

[0xc0170]

I wonder where we would use CMAKE_BINARY_DIR as we always related to the current target.
It looks like the current changes in this pull request should be current binary dir.

[ladislas]

I wonder where we would use CMAKE_BINARY_DIR as we always related to the current target.
It looks like the current changes in this pull request should be current binary dir.

@0xc0170 I'm not sure I understand what you mean :)

[0xc0170]

I might have not clearly stated, just that this change is all good. I am only wondering if the CMAKE_BINARY_DIR has any use for us in Mbed OS (if we ever need to use it). hypothetical question

[0xc0170]

CI started

[mbed-ci]

Jenkins CI Test : ✔️ SUCCESS

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jobs	Status
jenkins-ci/mbed-os-ci_unittests	✔️
jenkins-ci/mbed-os-ci_cmake-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_cmake-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-greentea-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-greentea-ARM	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_cmake-example-test	✔️
jenkins-ci/mbed-os-ci_greentea-test	✔️