CMake does not find package in "manifest mode" (but it can in "classical mode")

[hetfmt]

I have installed VCPKG to "C:\Tools\VCPKG" and have defined the following environment variables:

VCPKG_DEFAULT_TRIPLET = x64-windows
VCPKG_FEATURE_FLAGS = versions

Using Visual Studio Community, I would like to use VCPKG in manifest mode together with CMake, and have added a simple "vcpkg.json" to my project directory:

{
  "name": "python-in-cpp-vcpkg",
  "version": "1.0.0",
  "dependencies": [
    "python3"
  ],
  "builtin-baseline": "91dd61bd441a68b4017b61011d0350b2e6aeeccf",  
  "overrides": [
    {
      "name": "python3",
      "version": "3.7.3-3"
    }
  ]
}

I also have a "CMakePresets.json" filer, where I have added:
"CMAKE_TOOLCHAIN_FILE": "$env{VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake"
to the "cacheVariables" section.

In my "CMakeLists.txt" file I have added the following:

find_package (Python3 COMPONENTS Interpreter Development REQUIRED)
if (${Python3_FOUND})
    message ("Found Python3 " ${Python3_VERSION})
else()
    message ("Couldn't find Python3!")
endif()

When CMake generates, it appears to correctly install Python3 version 3.7.3:

1> [CMake] -- Running vcpkg install
1> [CMake] Detecting compiler hash for triplet x64-windows...
1> [CMake] The following packages will be built and installed:
1> [CMake]   * libffi[core]:x64-windows -> 3.4.4 -- C:\Tools\vcpkg\buildtrees\versioning_\versions\libffi\6552925531e923480b50d806c7d4538c1ff15481
1> [CMake]   * openssl[core]:x64-windows -> 3.0.7#2 -- C:\Tools\vcpkg\buildtrees\versioning_\versions\openssl\71beae5ba81d9198d1ca12024325630b6ad81446
1> [CMake]     python3[core]:x64-windows -> 3.7.3-3 -- C:\Tools\vcpkg\buildtrees\versioning_\versions\python3\4146575f2b9fe56a8d8a3045c6840aa65c50cff0
1> [CMake]   * vcpkg-cmake[core]:x64-windows -> 2022-12-22 -- C:\Tools\vcpkg\buildtrees\versioning_\versions\vcpkg-cmake\1913f86defd2140d0a6751be2d51952e4090efa4
1> [CMake]   * vcpkg-cmake-config[core]:x64-windows -> 2022-02-06#1 -- C:\Tools\vcpkg\buildtrees\versioning_\versions\vcpkg-cmake-config\8d54cc4f487d51b655abec5f9c9c3f86ca83311f
1> [CMake]   * vcpkg-cmake-get-vars[core]:x64-windows -> 2022-12-16 -- C:\Tools\vcpkg\buildtrees\versioning_\versions\vcpkg-cmake-get-vars\bad453fe7f58edb2e8d0093692dcaa52347e446c
1> [CMake] Additional packages (*) will be modified to complete this operation.
1> [CMake] A suitable version of 7zip was not found (required v21.7.0) Downloading portable 7zip 21.7.0...
1> [CMake] Downloading 7zip...
1> [CMake] https://www.7-zip.org/a/7z2107-extra.7z->C:\Tools\vcpkg\downloads\7z2107-extra.7z
1> [CMake] Downloading https://www.7-zip.org/a/7z2107-extra.7z
1> [CMake] Extracting 7zip...
1> [CMake] Restored 6 package(s) from C:\Users\het\AppData\Local\vcpkg\archives in 5.633 s. Use --debug to see more details.
1> [CMake] Installing 1/6 vcpkg-cmake:x64-windows...
1> [CMake] Elapsed time to handle vcpkg-cmake:x64-windows: 35.61 ms
1> [CMake] Installing 2/6 vcpkg-cmake-get-vars:x64-windows...
1> [CMake] Elapsed time to handle vcpkg-cmake-get-vars:x64-windows: 26.61 ms
1> [CMake] Installing 3/6 vcpkg-cmake-config:x64-windows...
1> [CMake] Elapsed time to handle vcpkg-cmake-config:x64-windows: 21.7 ms
1> [CMake] Installing 4/6 openssl:x64-windows...
1> [CMake] Elapsed time to handle openssl:x64-windows: 588.5 ms
1> [CMake] Installing 5/6 libffi:x64-windows...
1> [CMake] Elapsed time to handle libffi:x64-windows: 82.87 ms
1> [CMake] Installing 6/6 python3:x64-windows...
1> [CMake] Elapsed time to handle python3:x64-windows: 5.267 s
1> [CMake] Total install time: 11.66 s
1> [CMake] -- Running vcpkg install - done

However, when CMake tries to find Python3, it finds the wrong package:

1> [CMake] -- The C compiler identification is MSVC 19.34.31937.0
1> [CMake] -- The CXX compiler identification is MSVC 19.34.31937.0
1> [CMake] -- Detecting C compiler ABI info
1> [CMake] -- Detecting C compiler ABI info - done
1> [CMake] -- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.34.31933/bin/Hostx64/x64/cl.exe - skipped
1> [CMake] -- Detecting C compile features
1> [CMake] -- Detecting C compile features - done
1> [CMake] -- Detecting CXX compiler ABI info
1> [CMake] -- Detecting CXX compiler ABI info - done
1> [CMake] -- Check for working CXX compiler: C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.34.31933/bin/Hostx64/x64/cl.exe - skipped
1> [CMake] -- Detecting CXX compile features
1> [CMake] -- Detecting CXX compile features - done
1> [CMake] Looking for Python3...
1> [CMake] -- Found Python3: C:/Tools/Python311_64/python.exe (found version "3.11.1") found components: Interpreter Development Development.Module Development.Embed 
1> [CMake] Found Python3 3.11.1
1> [CMake] -- Configuring done
1> [CMake] -- Generating done
1> [CMake] -- Build files have been written to: C:/Users/het/source/python_test/Python_in_CPP_VCPKG_CMake/out/build/x64-debug
1> Extracted CMake variables.
1> Extracted source files and headers.
1> Extracted code model.
1> Extracted toolchain configurations.
1> Extracted includes paths.
1> CMake generation finished.

I have no path-entries referring to the Python 3.11.1 installation, but nevertheless this is what CMake finds instead of the just installed VCPKG Python 3.7.3.

If I choose to remove the "vcpkg.json" file and delete the "out" folder, and hence switch to classic mode, and here install Python3:

.\vcpkg.exe install python3

version 3.10.7 will be installed, and if I now generate CMake this package is found:

1> [CMake] -- The C compiler identification is MSVC 19.34.31937.0
1> [CMake] -- The CXX compiler identification is MSVC 19.34.31937.0
1> [CMake] -- Detecting C compiler ABI info
1> [CMake] -- Detecting C compiler ABI info - done
1> [CMake] -- Check for working C compiler: C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.34.31933/bin/Hostx64/x64/cl.exe - skipped
1> [CMake] -- Detecting C compile features
1> [CMake] -- Detecting C compile features - done
1> [CMake] -- Detecting CXX compiler ABI info
1> [CMake] -- Detecting CXX compiler ABI info - done
1> [CMake] -- Check for working CXX compiler: C:/Program Files/Microsoft Visual Studio/2022/Community/VC/Tools/MSVC/14.34.31933/bin/Hostx64/x64/cl.exe - skipped
1> [CMake] -- Detecting CXX compile features
1> [CMake] -- Detecting CXX compile features - done
1> [CMake] Looking for Python3...
1> [CMake] -- Found Python3: C:/Tools/vcpkg/installed/x64-windows/tools/python3/python.exe (found version "3.10.7") found components: Interpreter Development Development.Module Development.Embed 
1> [CMake] Found Python3 3.10.7
1> [CMake] Python3 include dirs: C:/Tools/vcpkg/installed/x64-windows/include/python3.10
1> [CMake] -- Configuring done
1> [CMake] -- Generating done
1> [CMake] -- Build files have been written to: C:/Users/het/source/python_test/Python_in_CPP_VCPKG_CMake/out/build/x64-debug
1> Extracted CMake variables.
1> Extracted source files and headers.
1> Extracted code model.
1> Extracted toolchain configurations.
1> Extracted includes paths.
1> CMake generation finished.

(NOTE: if "Interpreter" is not included in the "find_package" line, it will NOT correctly find "Developmet")

The question now is: why does it NOT find the package in "manifest mode" when it can find it in "classical mode"? Am I doing something wrong or have forgotten something?
If I create a new "identical" project, where I use the normal MSBuild-system instead of CMake, "manifest mode" works as expected and builds my project with Python3 v. 3.7.3 as instructed.

[JackBoosY]

Is your project configuration x64?

[JackBoosY]

Does python3-config.cmake or Python3Config.cmake exists in VCPKG_ROOT/installed/x64-window/share/python3?

[hetfmt]

No, neither of the two mentioned files exists in the specified folder:

[dg0yt]

python3 doesn't install cmake config, so the files won't exist.

I would suggesting running cmake with --trace-expand or with -DCMAKE_FIND_DEBUG_MODE=1 .

[dg0yt]

Do you run find_package in module mode at all? I miss this part of the error message:

  By not providing "Find....cmake" in CMAKE_MOUDLE_PATH this project has 
  asked CMake to find a package configuration file provided by "...", but
  CMake did not find one.

[hetfmt]

I tried to run in module mode, but that didn't fix the problem.
I will test with the suggested cmake options.
Unfortunately I will be away for the next 10 days, and will not be able to do more work right now.
Thanks.