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cmake: Remove VULKAN_HEADERS_INSTALL

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VULKAN_HEADERS_INSTALL was added since it was believed there was
a valid use case for it.

After looking into the use case that provoked this change there is
no reason to keep VULKAN_HEADERS_INSTALL as an option.

Here is the use case we do NOT want to support:
https://github.com/KhronosGroup/Vulkan-Headers/pull/416#issuecomment-1622318949

Fundamentally this problem is caused add_subdirectory/find_package
not being able to work together flawlessly.

Which isn't the responsibility of Vulkan-Headers to fix.

It's the responsibility of projects that consume Vulkan-Headers
to account for either method.

As described by the CMake maintainers:
https://discourse.cmake.org/t/idiomatic-way-to-handle-packages-and-add-subdirectory/8400
This commit is contained in:
Juan Ramos 2023-07-05 15:16:20 -06:00 • committed by Juan Ramos
parent 6f34ca5a37
commit 482af6d865
2 changed files with 4 additions and 12 deletions
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7
CMakeLists.txt
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@ -57,19 +57,14 @@ if (PROJECT_IS_TOP_LEVEL)
if (BUILD_TESTS)
add_subdirectory(tests)
endif()
endif()
option(VULKAN_HEADERS_INSTALL "Install Vulkan Headers" ${PROJECT_IS_TOP_LEVEL})
if (VULKAN_HEADERS_INSTALL)
include(GNUInstallDirs)
include(CMakePackageConfigHelpers)
set(VLK_REGISTRY_DIR "${CMAKE_INSTALL_DATADIR}/vulkan")
install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/include/vk_video" DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/include/vulkan" DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
# Preserve source permissions https://github.com/KhronosGroup/Vulkan-Headers/issues/336
install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/registry" DESTINATION ${VLK_REGISTRY_DIR} USE_SOURCE_PERMISSIONS)
install(DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/registry" DESTINATION "${CMAKE_INSTALL_DATADIR}/vulkan" USE_SOURCE_PERMISSIONS)
set_target_properties(Vulkan-Headers PROPERTIES EXPORT_NAME "Headers")