vcpkg toolchain file yields error for CMake .NET SDK targets

[gtsc]

Describe the bug I would like to use vcpkg in a CMake project that also includes .NET targets (e.g. relevant when having one project that has both C++, C++/CLI and .NET components, all built with CMake). When providing /path/to/vcpkg/scripts/buildsystems/vcpkg.cmake as CMAKE_TOOLCHAIN_FILE cache variable, I get the following error for every .NET target in the project:

CMake Error in CMakeLists.txt:
  The target "TARGET_NAME" does not currently support add_custom_command as
  the Visual Studio generators have not yet learned how to generate custom
  commands in .Net SDK-style projects.

This is unfortunate, as it prevents me using vcpkg in such project (or forces me to split up the project in some way).

Environment

• OS: Windows
• Compiler: MSVC 17.9 (Visual Studio 2022)

To Reproduce For easy reproduction, do the following:

1. Create a project with an empty vcpkg.json file and an empty Program.cs file at the root directory. In the CMakeLists.txt add the following lines:

cmake_minimum_required(VERSION 3.24)
project(TestProject LANGUAGES CSharp)
set(CMAKE_DOTNET_SDK "Microsoft.NET.Sdk")
set(CMAKE_DOTNET_TARGET_FRAMEWORK "net8.0")
add_executable(HelloWorld "Program.cs")

2. Run the following command: cmake -S /path/to/repo -B /path/to/build/dir -G "Visual Studio 17 2022" -DCMAKE_TOOLCHAIN_FILE="/path/to/vcpkg/scripts/buildsystems/vcpkg.cmake"

This will yield the error message shown above (with "HelloWorld" as TARGET_NAME).

Expected behavior I would expect the inclusion of the vcpkg toolchain file to not influence .NET targets.

Failure logs See attached file for logs obtained by running the CMake command shown above with --trace. cmake-trace.txt

Skimming through the logs makes me assume that /path/to/vcpkg/scripts/buildsystems/vcpkg.cmake(612) might be the problematic add_custom_command call (however, I don't 100% understand what is happening in here). Ideally, we should not do the add_custom_command for .NET targets to resolve this issue.

[Osyotr]

Try setting VCPKG_APPLOCAL_DEPS=OFF. These custom commands are used to automatically copy DLLs to the output folder.