[ChangeLog][configure] Added a -generate-vcpkg-manifest configure option. This generates a vcpkg.json file in the build directory. To just generate the manifest without configuring Qt, run configure with -generate-vcpkg-manifest -dry-run. [ChangeLog][configure] When configuring with -vcpkg, generate a vcpkg manifest file in the build directory, and set VCPKG_MANIFEST_DIR to the build directory to use that manifest file. You can turn off the manifest generation with -no-generate-vcpkg-manifest. You can turn off setting the manifest directory by passing -- -UVCPKG_MANIFEST_DIR to configure. Configuring with pure CMake won't generate a vcpkg.json. This patch adds a low-level CMake API for creating vcpkg manifests in QtVcpkgManifestHelpers.cmake. The functions qt_find_package and qt_feature gained arguments for creating dependencies in the manifest and add them to features. This adds a package dependency (not guarded by any feature): qt_find_package(WrapSystemFreetype 2.2.0 MODULE ... VCPKG_PORT freetype VCPKG_VERSION 2.3.4 ) This adds a package dependency `freetype` to the feature `freetype`: qt_find_package(WrapSystemFreetype 2.2.0 MODULE ... VCPKG_PORT freetype VCPKG_ADD_TO_FEATURE freetype ) This adds a feature `freetype` with `gui` as its "parent dependency": qt_vcpkg_scope(gui) ... qt_feature("freetype" PUBLIC PRIVATE SECTION "Fonts" LABEL "FreeType" PURPOSE "Supports the FreeType 2 font engine (and its supported font formats)." ) If features are turned on/off via configure arguments, we set the CMake variables VCPKG_MANIFEST_NO_DEFAULT to ON and VCPKG_MANIFEST_FEATURES to the list of corresponding vcpkg features to only install libraries that are needed for the build. For a per-repo build, we create a vcpkg.json with dependencies only for that repository. For a top-level build, we create a vcpkg.json with all dependencies of all repositories, excluding those that have been skipped (with configure's -skip argument). Task-number: QTBUG-73760 Change-Id: I6cc449d712f32d9e564acecaede5a7b31f309a8c Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>