Add support for FetchContent and find_package about vulkan-utility-libraries HOT 2 CLOSED

find_package relies on packages being built/installed by either a language package manager (vcpkg / conan for example) or a system package manager.

Thanks for the insight.

Looking more into that, it appears there is something new in CMake 3.24 that integrates FetchContent with find_package. By adding OVERRIDE_FIND_PACKAGE to my FetchContent call and making the name the same as the package, it all magically works!

Fixed sample:

cmake_minimum_required(VERSION 3.24) # <<< update minimum version
...
FetchContent_Declare(
  vulkan-headers
  GIT_REPOSITORY "https://github.com/KhronosGroup/Vulkan-Headers.git"
  GIT_TAG "2634c96" # latest as of writing
)

FetchContent_Declare(
  VulkanUtilityLibraries # <<< name same as below
  GIT_REPOSITORY "https://github.com/KhronosGroup/Vulkan-Utility-Libraries.git"
  GIT_TAG "87801a6" # latest as of writing
  OVERRIDE_FIND_PACKAGE) # <<< add this

FetchContent_MakeAvailable(vulkan-headers VulkanUtilityLibraries) # <<< update name

# Vulkan SDK uses find_package to look for this library, and this call now succeeds
find_package(VulkanUtilityLibraries REQUIRED) # <<< this name here
...

from vulkan-utility-libraries.

We do support find_package. It's actively used in VulkanProfiles and the ValidationLayers at this very moment. We even have tests for it in this repo.

FetchContent does NOT install packages. FetchContent by default clones a repo and calls add_subdirectory on it. IE making it a part of your project.

find_package relies on packages being built/installed by either a language package manager (vcpkg / conan for example) or a system package manager.

IE your example isn't correct.

include(FetchContent)

FetchContent_Declare(
  vulkan-headers
  GIT_REPOSITORY "https://github.com/KhronosGroup/Vulkan-Headers.git"
  GIT_TAG "2634c96" # latest as of writing
)

FetchContent_Declare(
  vulkan-utility
  GIT_REPOSITORY "https://github.com/KhronosGroup/Vulkan-Utility-Libraries.git"
  GIT_TAG "87801a6" # latest as of writing
)

FetchContent_MakeAvailable(vulkan-headers vulkan-utility)

target_link_libraries(add_subdirectory_example PRIVATE
    Vulkan::LayerSettings
    Vulkan::UtilityHeaders
)

# find_package(VulkanUtilityLibraries REQUIRED) # <<< this call fails because FetchContent doesn't install libraries. You already have the libraries when you called FetchContent_MakeAvailable

from vulkan-utility-libraries.