[tautschnig]

Tests of the C++ front end depend on the standard library headers cbmc preprocesses with (the host gcc's libstdc++, libc++, or the MSVC STL) and on GNU extensions or the Itanium ABI. regression/cbmc-cpp's CMake and Makefile now exclude, according to the host:

• libcxx (run, as CORE only, in a profile of its own where clang and the libc++ headers are installed), msvc-stl (only with MSVC);
• libstdcxx, libstdcxx12, libstdcxx13, libstdcxx16 (when the host gcc is not GNU gcc, or older than the version), broken-libstdcxx16 (with GCC 16 or later);
• gnu-extensions and itanium-abi with MSVC; gcc-only also when the build compiler is not GNU (in regression/cpp, too). CORE runs in four shards with a per-test timeout of 900 s, and without --validate-goto-model with GCC < 13. regression/README.md documents the tags. No test uses them yet: they are for the C++ tests to follow.

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.02%. Comparing base (826c1c7) to head (7afd09c).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #9407      +/-   ##
===========================================
- Coverage    81.02%   81.02%   -0.01%     
===========================================
  Files         1723     1723              
  Lines       191314   191314              
  Branches        73       73              
===========================================
- Hits        155020   155019       -1     
- Misses       36294    36295       +1     

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