Use gcov version that matches GNU compiler.#866
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If the GNU compiler version doesn't match the gcov version, lcov will report an error. Usually version of gcc and g++ are installed as g++-10, g++-11, etc, and gcov will be installed as gcov-10, gcov-11, etc. This code tries to match that. If it doesn't match, it falls back to the regular gcov.
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If the GNU compiler version doesn't match the gcov version, lcov will report an error. Usually version of gcc and g++ are installed as g++-10, g++-11, etc, and gcov will be installed as gcov-10, gcov-11, etc. This code tries to match that. If it doesn't match, it falls back to the regular gcov.