dnsdist: Enable the new YAML configuration in our packages

[rgacogne]

Short description

This PR switches the compiler from G++ to clang++ to keep building with LTO, which is not possible with g++ now that we link against a Rust-based static library built with LLVM.

Note that it breaks on EL-7 (no python yaml package) and Debian Buster (linking issue related to std::filesystem I haven't investigated yet). We might get away with not supporting DNSdist 2.0+ on these.

Checklist

I have:

• read the CONTRIBUTING.md document
• compiled this code
• tested this code
• included documentation (including possible behaviour changes)
• documented the code
• added or modified regression test(s)
• added or modified unit test(s)

[coveralls]

Pull Request Test Coverage Report for Build 12873140486

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 164 unchanged lines in 13 files lost coverage.
• Overall coverage increased (+0.009%) to 64.688%

---

Files with Coverage Reduction	New Missed Lines	%
pdns/packethandler.cc	1	72.35%
pdns/recursordist/aggressive_nsec.cc	2	66.02%
pdns/sstuff.hh	2	56.83%
pdns/recursordist/test-syncres_cc2.cc	3	88.85%
pdns/stubresolver.cc	3	77.58%
pdns/signingpipe.cc	5	83.91%
pdns/dnsparser.hh	6	78.53%
pdns/dnsdistdist/dnsdist-tcp.cc	8	75.79%
pdns/misc.cc	10	62.49%
pdns/dnsparser.cc	11	85.24%

Totals
Change from base Build 12869957002:	0.009%
Covered Lines:	127787
Relevant Lines:	166434

---

💛 - Coveralls

[Habbie]

Note that it breaks on EL-7 (no python yaml package) and Debian Buster (linking issue related to std::filesystem I haven't investigated yet). We might get away with not supporting DNSdist 2.0+ on these.

#14990 (should finish it soon) will drop both. You definitely can ignore them (although we might want to merge 14990 before merging this)

[rgacogne]

Successful run in https://github.com/rgacogne/pdns/actions/runs/12871028684

[miodvallat]

LGTM. Probably the least horrible way to go.

[romeroalx]

Thanks!

Test building images: https://github.com/romeroalx/pdns/actions/runs/12872083041