Wraping calls to find_package

[SylvainCorlay]

Wrapping calls to find_package allows building cppzmq without doing find_package(ZeroMQ) if the libzmq target is already defined.

This occurs when building a project which vendors all of its dependencies with add_subdirectory, resulting in targets being defined and find_package to fail.

Note: I agree that vendoring dependencies in generally bad practice but this is a requirement in our context as we are building a PyPI wheel.

[coveralls]

Pull Request Test Coverage Report for Build 345

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.483%

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Totals
Change from base Build 335:	0.0%
Covered Lines:	691
Relevant Lines:	799

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💛 - Coveralls

[sigiesec]

Looks ok to me. I wonder if there is a generic solution for this in CMake? I guess this may be necessary for any library in such circumstances.

[SylvainCorlay]

I wonder if there is a generic solution for this in CMake?

Not to my knowledge. I have looked and found this pattern in a bunch of places...

[SylvainCorlay]

Hey, is there a plan for a release soon that would include that change? I see that the master branch already indicates 4.7.

[SylvainCorlay]

@sigiesec do you guys have plans for a release including these changes in the near future?

Also, I wanted to say kudos to the whole team working on cppzmq. Clear deprecation warnings, clean cmake... The project has come a long way in the past year.