[CMake] [CPack] Avoiding packaging (some) dependencies

[Drago Trusk]

Hi everyone,

I have particular problem which I'm unable to solve.

Lets say there are following components:
 - Main: library/executable
 - Ignorable: Main requires it to build, but not for packaging

Main simply defines:
add_dependencies(Main Ignorable)

FindIgnorable.cmake contains something like:
add_custom_target(Ignorable
  COMMAND ... ... && cmake --build --target install .
  # ...
)

Problem is that deb cpack generator picks this from install tree (tar/zip
doesn't contain Ignorable). So deb ends up with:
# ... correct fs hierarchy
/home/saduser/projects/ignorableinstall

I need to avoid dependency used only for building artifacts.

What I found:
- Remove add_dependency
---- Problem: have to build dependencies manually and will break CI and
other people builds
- Disable automatic packaging of everything and specify custom components
to package
---- Problem: Dependency tree which might be bigger and requires to know
too many details. In addition requires for outside  changes so that all
targets have (appropriate)  install conponents.

I tried everything else that is possible. Am i missing something or are
those two only viable options?

Bye,
Drago
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