I want to know if the FetchContent and ExternalProject consider the CMAKE_CXX_COMPILER_LAUNCHER=ccache. Thx
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FetchContent brings things directly into the main build, so whatever you set up for the compiler will also apply to the dependencies brought in this way. In other words, CMAKE_CXX_COMPILER_LAUNCHER will also apply to the dependency (unless it has its own logic that overrides it).
ExternalProject sets up a separate child build, and from what I recall, it won’t propagate CMAKE_CXX_COMPILER_LAUNCHER to that sub-build. In general, it isn’t guaranteed to be safe for it to propagate that setting, because the external project could be using an entirely different toolchain, one which might not work with the launcher.
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Thx for reply, it makes sense