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Sebastian Holtermann authored
In the WarnUnusedCliUnused test, the whole CMakeCache.txt was removed in the clean stage to trigger the same CMake warning in re-builds. This technique worked only in the Makefile generators and the test was limited to these. Now only the variable of interest is removed from the cache by using a `unset(UNUSED_CLI_VARIABLE CACHE)` statement in the CMakeLists.txt file. This makes the WarnUnusedCliUnused test run on all generators
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