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This generator expression is the inverse of `LINK_ONLY` and only coveys usage requirements for the purposes of compilation. Its intended use is to avoid needing to export targets that do not have link usage requirements (e.g., header-only libraries) when used by another target. It will also be used to represent private usage requirements on exported C++ module-containing targets in the future. Eventually there should be logic to collapse nesting of `$<COMPILE_ONLY>` and `$<LINK_ONLY>` when generating instances of either. A TODO is left in the code for this case. See: #15415