• Stephen Kelly's avatar
    CLI: Suppress the unused warning if the key value pair is cached. · 273ecab9
    Stephen Kelly authored
    It is common to specify a CMAKE_TOOLCHAIN_FILE and get a warning
    for using it despite it not being used.
    
    The WarnUnusedCliUnused test relies on the warning being emitted
    each time cmake is run on an existing build. That behavior is changed
    by this patch to warn only on the first invokation of CMake, and not
    on subsequent invokations (because the variable is in the cache with
    the same value). For that test, a clean target is added which clears
    the cache and cause the warning to be emitted each time.
    
    As the Ninja generator does not support the feature needed to test
    this, it is not tested with that generator.
    273ecab9
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