ci: test all c++ versions

[iMichka]

Clarify that we are using clang
Cleanup CI
Add more macos versions

[iMichka]

@johnnynunez I need to check something before merging this. I think the cppstd value has no effect ... I would have expected this PR to fail.

[johnnynunez]

@johnnynunez I need to check something before merging this. I think the cppstd value has no effect ... I would have expected this PR to fail.

I change it in macos-15 and has effect from ++98 to 17. And works in arm

[johnnynunez]

seems that affects

2025-02-18T06:47:22.7836215Z ##[group]Run echo "ccflags=-std=c++20" >> tests/xml_generator.cfg
2025-02-18T06:47:22.7836649Z �[36;1mecho "ccflags=-std=c++20" >> tests/xml_generator.cfg�[0m

[johnnynunez]

@iMichka how is it going?

[iMichka]

Ok I know what is going on:

• I made a cleanup to make clear that the tests are running with clang++ and not gcc
• I added tests for more clang versions (13 up to 16)
• c++20 and c++23 can not be tested: clang 16 does not support c++20 fully, and c++23 is not supported at all. We will have to wait for clang 17

[iMichka]

Clang 15 on macOS is not working: skipping it for the time being, this might need a new castxml version.

[johnnynunez]

Ok I know what is going on:

• I made a cleanup to make clear that the tests are running with clang++ and not gcc
• I added tests for more clang versions (13 up to 16)
• c++20 and c++23 can not be tested: clang 16 does not support c++20 fully, and c++23 is not supported at all. We will have to wait for clang 17

thank you for amazing work and the information! I will rebase that PR

[mahmoudeA]

Gh