Attempt to fix appveyor build

[scribam]

No description provided.

[0-wiz-0]

Thank you for looking at fixing the appveyor build!
The proposed patch is incorrect though. As you can see in https://ci.appveyor.com/project/nih-at/libzip/builds/50232046/job/oq2p1n7arprtib7y zlib, liblzma and zstd are not found by the build. (Which is the whole point of using vcpkg, to provide these dependencies.)

[scribam]

@0-wiz-0 Are you sure this is incorrect?
When I look at the CMake configure step from your link, I can read:

-- Found ZLIB: optimized;C:/projects/libzip/build/vcpkg_installed/x64-windows/lib/zlib.lib;debug;C:/projects/libzip/build/vcpkg_installed/x64-windows/debug/lib/zlibd.lib (found suitable version "1.3.1", minimum required is "1.1.2")
-- Found BZip2: optimized;C:/projects/libzip/build/vcpkg_installed/x64-windows/lib/bz2.lib;debug;C:/projects/libzip/build/vcpkg_installed/x64-windows/debug/lib/bz2d.lib (found version "1.0.8")
[...]
-- Found LibLZMA: optimized;C:/projects/libzip/build/vcpkg_installed/x64-windows/lib/lzma.lib;debug;C:/projects/libzip/build/vcpkg_installed/x64-windows/debug/lib/lzma.lib (found suitable version "5.4.4", minimum required is "5.2")
[...]
-- Found zstd: C:/projects/libzip/build/vcpkg_installed/x64-windows/debug/lib/zstd.lib (Required is at least version "1.3.6")

Also, these files are included in the compilation process:

• zip_algorithm_bzip2.c
• zip_algorithm_xz.c
• zip_algorithm_zstd.c

[0-wiz-0]

Ok, that is weird. Perhaps I misinterpreted something.

However, can you please explain how vcpkg knows to install these three packages after your patch?

[scribam]

With this file https://github.com/nih-at/libzip/blob/main/vcpkg.json

Manifest mode uses declarative JSON files to describe metadata about your project or package. In any case, the name of this file is vcpkg.json.

Manifest mode is engaged by running the vcpkg install command while there's a manifest file (vcpkg.json) in the working directory.

Source: https://learn.microsoft.com/en-us/vcpkg/concepts/manifest-mode

[0-wiz-0]

Thanks!