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This was referenced Oct 13, 2026
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The GCC warning pattern permits an absent
[-W...]suffix, but extraction calls string methods on the missing capture. Store an empty option string for that case and retain existing GCC and Clang option parsing.Fixes #159336.
Validation (Windows debug build): the isolated warning-option regression passed (1 test), including suffix-free GCC output and GCC/Clang option suffixes; the suffix-free case failed before the fix. The isolated patch applies cleanly to the base revision.
Merge coordination: #159339 and #159341 add different regression tests to the same new
test_check_warnings.pymodule. After the first PR merges, the remaining branches need to incorporate the landed tests before merging.