Avoid init class definition for compatibility

[paul-szczepanek-arm]

Summary of changes

Avoid compatibility problems by not initialising the member variable in class definition. As reported here:
#14511

Impact of changes

Migration actions required

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

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[jeromecoutant]

• ARM: no more warning
• IAR: compilation is OK

Thx!

[ciarmcom]

@paul-szczepanek-arm, thank you for your changes.
@ARMmbed/mbed-os-maintainers please review.

[kjbracey]

It's worth noting that these bitfields are a bad idea in terms of code size. I've stripped a lot of similar ones on a customer branch. You're not gaining enough (or anything) in RAM to justify the ROM increase.

By inspection, I don't think this particular case saves RAM at all over just 2 bools.

I'd reserve bitfields for classes where you really do have a significant number of instances of the class, and a significant number of bits.

(And ironically bitfields are the least ROM efficient on the most constrained systems - ARMv6-M and ARMv8-M baseline don't have the specialised bitfield access instructions, so they particularly bloat code on an M0).

[0xc0170]

CI s tarted

[mbed-ci]

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