What is the preferred way to just touch the variable, inside the CMakeLists.txt?

I've got a bunch of similar ExternalProjects that are called in a loop with the same variables. Some of the projects don't need specific variables.

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1 Answer

You could simply disable this warning all-together by passing --no-warn-unused-cli to CMake. See:

Touching the variable is explicitly not wanted according to one of the CMake authors:

Nevertheless, for variables passed by -DFOO=bar -DBAR=3 -DBAZ=true you can add a line

set(ignoreMe "${FOO}${BAZ}${BAR}")

to one of your CMakeLists.txt which should be enough to suppress the warning.

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