CMake: Rename TEST_TARGET to APP_TARGET in greentea test CMakeLists.txt file

[rajkan01]

Summary of changes

• mbed_generate_options_for_linker is now always tied up with APP_TARGET CMake variable so renamed TEST_TARGET to APP_TARGET in all greentea test CMakeLists.txt

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

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

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Reviewers

@0xc0170 @hugueskamba

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[ciarmcom]

@rajkan01, thank you for your changes.
@hugueskamba @0xc0170 @ARMmbed/mbed-os-security @ARMmbed/mbed-os-connectivity @ARMmbed/mbed-os-core @ARMmbed/mbed-os-hal @ARMmbed/mbed-os-maintainers please review.

[0xc0170]

@rwalton-arm I've noticed this as well as I was testing older example from a user. APP_TARGET is required for an app to define now as we removed the function call to get app name for linker scripts. Is this intended behavior?

We got mbed_configure_app_target that app is calling, either we remove that one and just use APP_TARGET. Or leave there this app target, and get the name of app target we can attach to. Or any other suggestions, this is the TODO:

# TODO: Remove this and find a more idiomatic way of passing compile definitions to CPP without
# using global properties.
mbed_generate_options_for_linker(${APP_TARGET} LINKER_PREPROCESS_DEFINITIONS)
set_property(GLOBAL PROPERTY COMPILE_DEFS_RESPONSE_FILE ${LINKER_PREPROCESS_DEFINITIONS})

@rajkan01 This needs to be addressed, there is inconsistency in our CMake now.

[0xc0170]

Hold on, let's review why is this required and if it possible to fix. This is related to our story with object libraries.

As this broke the test, we need to fix as soon as possible. The object libs will take much longer to get the changes in.

I'll look at addressing this issue now and continue with object libraries the next sprint.

[0xc0170]

This should address the issue and this pull request should not be needed - please test #14265

[rajkan01]

This should address the issue and this pull request should not be needed - please test #14265
@0xc0170 With PR #14265 changes (removing dependency with APP_TARGET CMake variable) solves the issue of renaming TEST_TARET to APP_TARGET but failed to create map file for GCC_ARM toolchain with DISCO_L475VG_IOT01A