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lcov 2.x, as shipped in the Ubuntu 24.04 CI containers, promotes two conditions the weekly coverage run always hits from warnings to fatal errors: - "mismatched end line": two functions starting on the same source line with different end lines. Every gtest TEST() body trips this, as the macro also defines the fixture constructor and destructor on the TEST() line, so both lcov --capture invocations abort. - "unused": a --remove pattern which matched nothing; ".waf*" never matches, so the pattern-removal step aborts. Pass --ignore-errors for those classes on the affected invocations. lcov 1.x rejects unknown error classes, so the arguments are only emitted when lcov reports version 2 or later.