[opencv4] build failure

[nickanthony-dgl]

Operating system

Windows 10

Compiler

MSVC

Steps to reproduce the behavior

When installing opencv4 without default features (`vcpkg install opencv4[core]`) it will fail during configuration because CMake will try to find flatbuffers. Since flatbuffers is not a dependency of opencv4 when default features are not enabled it will not be found and configuration will fail.

This issue occurs on version 4.8.0, port versions: 16-18. Port version 15 appears to work correctly.

Probably because the "fix-no-flatbuffers" patch was introduced in version 16

Failure logs

This shows the configuration failure when building on the most recent port version (18):
config-x64-win-llvm-release-out (2).log

Additional context

No response

[FrankXie05]

@nickanthony-dgl Thanks for posting this issue, teh default functionality ensures that basic functionality is provided when the library is installed, making it easier for users to start using the library without worrying about missing necessary functionality.
https://github.com/microsoft/vcpkg-docs/blob/main/vcpkg/concepts/default-features.md

[nickanthony-dgl]

So you're telling me it's intentional opencv4 should fail to build without default features?

[dg0yt]

So you're telling me it's intentional opencv4 should fail to build without default features?

It must not fail without default features. category:port-bug The issue is with a library, which is something the port should already support .

[nickanthony-dgl]

Fixed by #38594