WIP: [libzippp] New port: C++ wrapper for libzip

[PhilLab]

Closes #6600

Please review thoroughly as this was more or less trial-and-error :-D

[PhilLab]

@ctabin are you interested in the vcpkg port? The windows-static port fails and Linux / OSX are still missing

[ctabin]

Hello @PhilLab,

Yes that would be great !
Let me know how I can help.

[PhilLab]

@ctabin: Could help with the static port? I don't quite understand why it fails

[ctabin]

@PhilLab I'll take a look asap 😅

[vicroms]

Hi @PhilLab

Thanks for the enthusiasm in adding new ports!

I made some (pretty invasive) changes to your PR.

I replaced the build system (CMakeLists.txt file), to address some issues (@ctabin can you review whether these changes are wanted, so I might consider submitting a PR to libzippp's repository):

• Respect BUILD_SHARED_LIBS variable.
  • Allows users to select whether to build STATIC or SHARED libraries from the command line, or in vcpkg by using an appropriate triplet.
  • Removes -shared and -static suffixes from produced binaries. A static build produces lib/libzippp.lib, and a shared build produces bin/libzippp.dll, bin/libzippp.pdb and lib/libzippp.lib.
  • NOTE: This change can break downstream consumers that rely on the old names, possibly alleviated by the next change.
• Support CMake integration using find_package(libzippp::libzippp)
  • Have CMake generate libzipppConfig.cmake and libzipppTargets*.cmake.
• Use a FindLIBZIP.cmake module to search for libzip.
  • Removes reliance on hard-coded paths.**
• Allow CMake on MacOS and Linux.
• Add option BUILD_TESTS to enable skipping building of tests
  • BUILD_TESTS is ON by default.

[PhilLab]

@vicroms: Thank you for extending the PR. As my current Cmake knowledge is limited to "making stuff work somehow" it is good to see a clearer approach 😄

[ctabin]

Hello @vicroms,

Thanks for investigating and solving the static builds ! 😃 Your changes looks good to me and it would be awesome if you could submit a PR, so I would to a new release of libzippp with the latest changes.

[vicroms]

Thanks @PhilLab and @ctabin for this PR!
The port is now clean of extra CMake files and works with the upstream CMakeLists.txt!

[PhilLab]

@vicroms The port files now do not copy the pdb files anymore, is this intended?

[PhilLab]

@vicroms Additionally as I noticed now, the dependent libzip module does not come with cmake support.

TARGET_LINK_LIBRARIES(myTarget LIBZIPPP::LIBZIPPP)

fails because Libzip could not be found:

Could not find a package configuration file provided by "LIBZIP" with any
of the following names:

LIBZIPConfig.cmake
libzip-config.cmake

[Flamefire]

@PhilLab Unfortunately LibZip does not provide CMake support for the installed targets. I'm working on ctabin/libzippp#52 to install the FindLIBZIP.cmake (which fixes that) together with some other changes. You might want to watch that PR and update the vcpkg once merged