[vulkan-headers] 'PFN_VoidFunction': is not a member of 'vk' when using vulkan.cppm

[Blechwolf]

Operating system

Windows

Compiler

MSVC

Steps to reproduce the behavior

- Running vcpkg in manifest mode
- including vulkan-headers version 1.4.304.0
- Build a module out of vulkan.cppm using the following CMakeLists.txt:
find_package(VulkanHeaders CONFIG REQUIRED)
find_package(Vulkan REQUIRED)

add_library(VulkanHppModule)
add_library(Vulkan::cppm ALIAS VulkanHppModule)

set_target_properties(VulkanHppModule
   PROPERTIES
     CXX_STANDARD_REQUIRED ON
     CXX_EXTENSIONS OFF
     CXX_MODULE_STD OFF
)

target_compile_definitions(VulkanHppModule
   PRIVATE
      VULKAN_HPP_NO_SMART_HANDLE
      VULKAN_HPP_NO_CONSTRUCTORS
   PUBLIC
      VULKAN_HPP_DISPATCH_LOADER_DYNAMIC=0
)

target_compile_features(VulkanHppModule
   PUBLIC
     cxx_std_20
)
target_include_directories(VulkanHppModule
   PRIVATE
   "${Vulkan_INCLUDE_DIR}"
)
target_link_libraries(VulkanHppModule
   PRIVATE
      Vulkan::Headers
      Vulkan::Vulkan
)
target_sources(VulkanHppModule
   PUBLIC
      FILE_SET cxx_modules TYPE CXX_MODULES 
      BASE_DIRS
         "${Vulkan_INCLUDE_DIR}"
      FILES
         "${Vulkan_INCLUDE_DIR}/vulkan/vulkan.cppm"
)

Failure logs

[build] <...>\build\VS2022\vcpkg_installed\x64-windows\include\vulkan\vulkan.cppm(2701): error C2039: 'PFN_VoidFunction': is not a member of 'vk'
[build] <...>\build\VS2022\vcpkg_installed\x64-windows\include\vulkan\vulkan.cppm(29): note: see declaration of 'vk'
[build] <...>\build\VS2022\vcpkg_installed\x64-windows\include\vulkan\vulkan.cppm(2701): error C2873: 'PFN_VoidFunction': symbol cannot be used in a using-declaration

Additional context

• Editing vulkan.cppm at line 2701 and commenting the using statement fixes the problem

[MonicaLiu0311]

PS E:\vcpkg> ./vcpkg version
vcpkg package management program version 2025-01-29-a75ad067f470c19f030361064e32a2585392bee2

See LICENSE.txt for license information.

Confirmed, repro locally.