[zlib] find_package(zlib) cannot locate correctly installed library files about vcpkg

[Neumann-A]

C:/root_v6.26.10/cmake/ROOTConfig.cmake(120):  if(MSVC )
C:/root_v6.26.10/cmake/ROOTConfig.cmake(121):  set(CMAKE_FIND_LIBRARY_PREFIXES lib )
C:/root_v6.26.10/cmake/ROOTConfig.cmake(122):  set(CMAKE_FIND_LIBRARY_SUFFIXES .lib .dll )

[petrmanek]

A quick update: I confirmed that the following variables are configured to empty strings (as they should be on Windows) at the time when find_package(zlib) is called:

• CMAKE_IMPORT_LIBRARY_PREFIX
• CMAKE_SHARED_LIBRARY_PREFIX
• CMAKE_STATIC_LIBRARY_PREFIX

[Neumann-A]

IT IS: find_package(ZLIB REQUIRED)

This seems to me like the 'lib' prefix is incorrectly applied inside vcpkg cmake module for zlib.

give a --trace-expand log if that doesn't fix it

[petrmanek]

IT IS: find_package(ZLIB REQUIRED)

My bad, I typed too fast. Yes, I am aware of that. Just for context: my project does not depend on zlib directly, instead it includes another package (QuaZip) that depends on zlib. I can confirm that QuaZip uses the correct capitalization.

I will provide a --trace-expand log in a moment.

[petrmanek]

@Neumann-A Here you go: 41835.log (11 MB)

[petrmanek]

Lol, you beat me to it by a second!

[petrmanek]

It seems that simply having a dependency on the ROOT framework seems to mess up CMAKE_FIND_LIBRARY_PREFIXES, and zlib is an innocent casualty.

[petrmanek]

Since I am using a little bit outdated version of ROOT (6.26), I will confirm that this behavior is present in the latest version (6.32) as well, and file a bug report upstream if need be. I suppose that this is not a vcpkg problem after all.

Thanks for a quick exchange, I am closing this as resolved.

[Neumann-A]

Feel free to use/update https://github.com/Neumann-A/my-vcpkg-ports/tree/master/root
However debug builds of root are buggy / not working on windows.

[petrmanek]

@Neumann-A Thanks, I will check it out!

In the meantime, I have confirmed that this behavior is indeed present in ROOT 6.32. I will file a bug upstream in a moment.