VulkanSDK Fetching the library with CMake

I am currently trying to link vulkan to my project in CMake. I want to download the VulkanSDK with CMake without depending anything but CMake.

I tried to use FetchContent but it only downloads the header files of VulkanSDK. I tried to use ExternalProject but somehow it does the same thing as FetchContent.

I dont not even start implementing a script to download dxcompilerd, glslangd, shaderc_combinedd, spirv-cross-cored etc.

Test for ExternalProject

include(FetchContent)
include(ExternalProject)

set(VULKAN_VER_MAJOR 1)
set(VULKAN_VER_MINOR 3)
set(VULKAN_VER_PATCH 275)

set(VULKAN_VERSION ${VULKAN_VER_MAJOR}.${VULKAN_VER_MINOR}.${VULKAN_VER_PATCH})

ExternalProject_Add(
    vulkan
    PREFIX Vulkan
    GIT_REPOSITORY https://github.com/KhronosGroup/Vulkan-Headers.git
    GIT_TAG v${VULKAN_VERSION}
    CONFIGURE_COMMAND ""
    BUILD_COMMAND ""
    INSTALL_COMMAND ""
    LOG_DOWNLOAD ON
)

ExternalProject_Get_Property(vulkan SOURCE_DIR)
include_directories(${SOURCE_DIR}/include)

add_library(Vulkan INTERFACE)
add_dependencies(Vulkan vulkan)

# Add source to this project's executable.
add_executable (VulkanTest "VulkanTest.cpp" "VulkanTest.h")

target_link_libraries(VulkanTest Vulkan)

if (CMAKE_VERSION VERSION_GREATER 3.12)
  set_property(TARGET VulkanTest PROPERTY CXX_STANDARD 20)
endif()

Test for FetchContent

include(FetchContent)

set(VULKAN_VER_MAJOR 1)
set(VULKAN_VER_MINOR 3)
set(VULKAN_VER_PATCH 275)

set(VULKAN_VERSION ${VULKAN_VER_MAJOR}.${VULKAN_VER_MINOR}.${VULKAN_VER_PATCH})

FetchContent_Declare(
    vulkanheaders
    GIT_REPOSITORY https://github.com/KhronosGroup/Vulkan-Headers.git
    GIT_TAG v${VULKAN_VERSION}
    GIT_SHALLOW TRUE
    GIT_PROGRESS TRUE
)

FetchContent_Declare(
    vulkanloader
    GIT_REPOSITORY https://github.com/KhronosGroup/Vulkan-Loader.git
    GIT_TAG v${VULKAN_VERSION}
    GIT_SHALLOW TRUE
    GIT_PROGRESS TRUE
)

FetchContent_Declare(
    vulkanvalidation
    GIT_REPOSITORY https://github.com/KhronosGroup/Vulkan-ValidationLayers.git
    GIT_TAG v${VULKAN_VERSION}
    GIT_SHALLOW TRUE
    GIT_PROGRESS TRUE
)

FetchContent_Declare(
    vulkantools
    GIT_REPOSITORY https://github.com/KhronosGroup/Vulkan-Tools.git
    GIT_TAG v${VULKAN_VERSION}
    GIT_SHALLOW TRUE
    GIT_PROGRESS TRUE
)

set(PROJECT_IS_TOP_LEVEL OFF)
FetchContent_MakeAvailable(vulkanheaders)
FetchContent_MakeAvailable(vulkanloader)
FetchContent_MakeAvailable(vulkanvalidation)
FetchContent_MakeAvailable(vulkantools)

add_library(myvulkan INTERFACE IMPORTED)
target_include_directories(myvulkan INTERFACE ${vulkan_headers_SOURCE_DIR}/include
    ${vulkan_loader_SOURCE_DIR}/loader
    ${vulkan_validation_layers_SOURCE_DIR}/layers
    ${vulkan_tools_SOURCE_DIR}/vulkaninfo)
target_link_libraries(myvulkan INTERFACE Vulkan::Vulkan)
target_link_libraries(myvulkan INTERFACE 
    Vulkan::Loader
    Vulkan::ValidationLayers
)

# Add source to this project's executable.
add_executable (VulkanTest "VulkanTest.cpp" "VulkanTest.h")

target_link_libraries(VulkanTest PRIVATE myvulkan)

if (CMAKE_VERSION VERSION_GREATER 3.12)
  set_property(TARGET VulkanTest PROPERTY CXX_STANDARD 20)
endif()

What should I do to make vulkan sdk ready for my project without depending on manually downloading it?

The Khronos official Vulkan samples repository already builds without requiring you to download the SDK.

It does this by including a bunch of other repositories as Git submodules but you could accomplish the same thing with FetchContent.

However, if you want a more detailed answer you're going to need to be more explicit about what's not working.