Just showing the error output:

/data/ultifi/up-cpp/test/coverage/datamodel/UuidBuilderTest.cpp:73:12: error: implicit conversion changes signedness: 'long' to 'unsigned long' [clang-diagnostic-sign-conversion]
/data/ultifi/up-cpp/test/coverage/datamodel/UuidBuilderTest.cpp:75:12: error: implicit conversion changes signedness: 'long' to 'unsigned long' [clang-diagnostic-sign-conversion]