Enabling building of GCC platform as a standalone shared library with no dependencies on e.g. Boost

[avtolstoy]

TODO

1. Add a cmake file (potentially generated in runtime) which can simplify using this in libraries/applications
2. Update CI to generate ready-to-use containers during release with Device OS prebuilt as a shared library

Problem

We want to simplify unit testing of libraries or applications that rely on Device OS APIs.

Solution

Build complete GCC platform for the host machine without any external dependencies on e.g. Boost, so that only stubs are generated, which can be easily mocked e.g. with Hippomocks.

NOTE: this requires GCC >= 6, as we need -fno-plt to enable mocking of symbols coming from shared library.

Steps to Test

See https://github.com/particle-iot-inc/device-os-unit-test-demo

Example App

N/A

References

N/A

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Completeness

• User is totes amazing for contributing!
• Contributor has signed CLA (Info here)
• Problem and Solution clearly stated
• Run unit/integration/application tests on device
• Added documentation
• Added to CHANGELOG.md after merging (add links to docs and issues)

[eberseth]

The "steps to test" repo is not public. Can you provide snippets here?

[avtolstoy]

@eberseth It's in a different org, you should have permissions for it though?

[eberseth]

@avtolstoy Could we merge this for 6.x? There is some future work that would benefit from not having Boost dependencies.

[avtolstoy]

@eberseth This is only useful for unit testing/mocking.

Build complete GCC platform for the host machine without any external dependencies on e.g. Boost, so that only stubs are generated, which can be easily mocked e.g. with Hippomocks.

GCC platform to work does require Boost, this will simply replace proper implementations with empty stubs.