Fix clang compilation in CI

[sdebionne]

Description

Two CI jobs are currently failing. Investigate if they can be fixed or if they are deprecated and can be removed.

References

posix (clang, clang++-5.0, 14,1z, ubuntu-latest, ubuntu:18.04, clang-5.0)

posix (clang, 14,17, macos-13)

Tasklist

• Ensure all CI builds pass
• Review and approve

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.99%. Comparing base (06c421a) to head (82fb089).
⚠️ Report is 25 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #778      +/-   ##
===========================================
- Coverage    82.34%   81.99%   -0.35%     
===========================================
  Files          117      117              
  Lines         5726     5354     -372     
===========================================
- Hits          4715     4390     -325     
+ Misses        1011      964      -47     

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[sdebionne]

On (clang, 14,17, macos-13)

The build fails with cxxstd=17:

dyld[33139]: Symbol not found: __ZNSt3__13pmr20get_default_resourceEv
  Referenced from: <426B1D7D-5F1D-3549-BDD0-112914243EED> /Users/runner/work/gil/boost-root/bin.v2/libs/gil/test/core/image/image.test/clang-darwin-15/debug/x86_64/cxxstd-17-iso/threading-multi/visibility-hidden/image
  Expected in:     <8CAC377D-FCC3-34DD-8FA6-C76EBB4D68C9> /usr/lib/libc++.1.dylib

On (clang, clang++-5.0, 14,1z, ubuntu-latest, ubuntu:18.04, clang-5.0)

The build is completely broken with cxxstd=1z

[sdebionne]

The first issue is a well know issue of the libc++ that ships with macos 13 and can eventually be fixed with a polyfill like https://github.com/acts-project/vecmem/pull/105/files

As for the second issue, I am in favor of dropping this variant.

[mloskot]

I also think dropping that variant sounds sensible.

[sdebionne]

Regarding macos 13, I have just got this

This is a scheduled macos-13 brownout. The macOS-13 based runner images are being deprecated. For more details, see actions/runner-images#13046.

So the effort to fix it is not worth it.

[mloskot]

Awesome, thank you!