[danmar]

CI-mingw is failing on master (e.g. https://github.com/cppcheck-opensource/simplecpp/actions/runs/40300479372) for two unrelated reasons:

CLANG64 (clang++): MSYS2 now ships clang 23.1.3, and -Weverything enables new lifetime-safety suggestion warnings (-Wlifetime-safety-intra-tu-suggestions, -Wlifetime-safety-intra-tu-constructor-suggestions, -Wlifetime-safety-cross-tu-constructor-suggestions), which fail the build with CMAKE_COMPILE_WARNING_AS_ERROR. These are disabled via add_compile_options_safe, so older compilers are unaffected. A TODO is left to consider adding [[clang::lifetimebound]] annotations instead.

MINGW32 (g++): mingw-w64-i686-python-pytest is no longer available, and setup-msys2 warns that MINGW32 is deprecated with no replacement. MINGW32 is removed from the matrix. Note: this leaves no 32-bit build in CI.

[dmcppcheck]

AI review

I found no problems in this PR. It only changes CI and CMake.

• CMake: the three -Wno-lifetime-safety-* flags are added through add_compile_options_safe. On a clang that doesn't know them, check_cxx_compiler_flag fails, so the flags are skipped and the build is unaffected. They are also added inside the Clang branch, so the MINGW64 + clang++ job gets them too.
• Workflow: removing MINGW32 also removes its include and exclude entries, and no other part of the workflow still refers to MINGW32 or i686.

The description already says that CI will have no 32-bit build after this. I couldn't check with clang 23 because it isn't in the container.

Testing

• make -j8 testrunner simplecpp CXXOPTS=-Werror in pr/: built with no errors. ./testrunner exit code 0. python3 run-tests.py: 0 failed, 21 skipped. python3 -m pytest integration_test.py: 128 passed. ./selfcheck.sh exit code 0.
• CMake path with an older clang: CXX=clang++ cmake -S . -B build -DCMAKE_COMPILE_WARNING_AS_ERROR=On with clang 18.1.3 and cmake 3.28.3. All three HAS_CXX_FLAG_Wno_lifetime_safety_* checks report Failed, so the flags are not added. The simplecpp and testrunner targets build with warnings-as-errors and testrunner passes.
• Not tested: clang 23, where the flags should be accepted and the warnings turned off, and the MSYS2 workflow itself. Neither is available offline.
• I didn't write preprocessor test inputs because the PR doesn't change any preprocessing code.

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Automated review of 5cc78a0 by Claude. The pull request was built and tested locally.