Attempts to test a long long variable using IBM Rational Test RealTime result in an unexpected value in the report.
You test MyVarLong in the following way.
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The test truncated the obtained value to a 32-bits value.
Minimalist GNU for Windows (MinGW) uses the MSVCRT library for the printf format that Test RealTime uses.
Resolving the problem
You need to customize the MinGW Target Deployment Port to use the MSVCRT library.
To do so, use the Target Deployment Port Editor in Parser Settings > Header adaptation for C.