[CONFIGURATION] File configuration - cmake build

[marcalff]

Contributes to #2481

This is a partial fix, to implement the CMake build.

Changes

Please provide a brief description of the changes here.

• Implement the CMake build.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.11%. Comparing base (0875ca1) to head (bc2d89d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3655      +/-   ##
==========================================
- Coverage   90.15%   90.11%   -0.04%     
==========================================
  Files         221      221              
  Lines        7135     7135              
==========================================
- Hits         6432     6429       -3     
- Misses        703      706       +3     

see 1 file with indirect coverage changes

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[dbarker]

Thanks for the PR. Excited to get this building :). I left some comments and mainly interested in getting the ryml dependency managed like the others (git tag files to define the version, FetchContent support, and install with the common third party CMake project instead of the bash script). Seems reasonable to follow up with these before the next release if it's too much change in this PR.

[marcalff]

Thanks for the PR. Excited to get this building :). I left some comments and mainly interested in getting the ryml dependency managed like the others (git tag files to define the version, FetchContent support, and install with the common third party CMake project instead of the bash script). Seems reasonable to follow up with these before the next release if it's too much change in this PR.

Thanks for all the comments.

Most fixed, the cmake install tests are deferred to a follow up PR.

I propose to merge this part now, it is self contained and a good size fix already, no need to make it bigger.

[dbarker]

For the follow up PR with install tests we should also change this to

set(RYML_ENABLE_INSTALL ${OPENTELEMETRY_INSTALL} CACHE BOOL "" FORCE)

This should allow the install to complete if ryml is fetched.

[dbarker]

Looks good. Thanks! Noting some potential follow up PRs.

• replace add_definitions with target_compile_definitions in the example and elsewhere
• Update ryml.cmake to install ryml if OPENTELEMETRY_INSTALL is ON
• Test the new yaml example with the install
• Consider breaking up the opentelemetry-cpp::configuration target into opentelemetry-cpp::configuration_common and a opentelemetry-cpp::configuration_ryml target that brings in the third party dependency.