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dirk-thomas avatar dirk-thomas commented on August 20, 2024

The first argument of ARGN is taken as signature. In the CMake docs several different signatures are described so this is not a separate argument but just the same as the original CMake function.

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csukuangfj avatar csukuangfj commented on August 20, 2024

@dirk-thomas
Should it be the ARGV instead of ARGN that contains the list of all arguments?

In this situation, ARGN does not contain the named argument signature.

Please refer to the CMake documentation https://cmake.org/cmake/help/v3.0/command/function.html

Additionally ARGV holds the list of all arguments given to the function and ARGN holds the list of arguments past the last expected argument.

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dirk-thomas avatar dirk-thomas commented on August 20, 2024

The CMake documentation says:

Additionally ARGV holds the list of all arguments given to the function and ARGN holds the list of arguments past the last expected argument.

ARGN is intentionally used since the explicitly taken parameter signature is used to dispatch to the desired function or is passed before ARGN in case the original install function is called (see https://github.com/ament/ament_cmake/blob/master/ament_cmake_core/cmake/symlink_install/install.cmake#L24-L40).

I created #144 to document the signature parameter`.

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