Search for Vulkan_Layer_VALIDATION on iOS if not defined or found by FindVulkan.cmake

Author: SRSaunders

app/CMakeLists.txt

@@ -137,12 +137,12 @@ if(IOS)
     endif ()
     # Vulkan cache variables already defined by main project CMakeLists and updated on Apple platforms by global_options.cmake
     if(Vulkan_LIBRARY AND ${Vulkan_VERSION} VERSION_GREATER_EQUAL 1.3.278)
-        get_filename_component(Vulkan_Target_SDK "$ENV{VULKAN_SDK}" REALPATH)
+        get_filename_component(Vulkan_Target_SDK "$ENV{VULKAN_SDK}/.." REALPATH)
         target_sources(${PROJECT_NAME} PRIVATE
-                ${Vulkan_Target_SDK}/share/vulkan
+                ${Vulkan_Target_SDK}/iOS/share/vulkan
         )
         set_source_files_properties(
-                ${Vulkan_Target_SDK}/share/vulkan
+                ${Vulkan_Target_SDK}/iOS/share/vulkan
                 PROPERTIES
                 MACOSX_PACKAGE_LOCATION Resources
         )

bldsys/cmake/global_options.cmake

@@ -1,5 +1,5 @@
 #[[
- Copyright (c) 2019-2025, Arm Limited and Contributors
+ Copyright (c) 2019-2026, Arm Limited and Contributors
 
  SPDX-License-Identifier: Apache-2.0
 
@@ -78,10 +78,10 @@ if(APPLE)
 		else()
 			message(FATAL_ERROR "Can't find MoltenVK library. Please install the Vulkan SDK or MoltenVK project and set VULKAN_SDK.")
 		endif()
-	#elseif(OTHER_VULKAN_DRIVER)
-		# handle any special processing here for other Vulkan driver (e.g. KosmicKrisp) for standalone usage on macOS or deployment to iOS
-		# would likely require extensions to CMake find_package() OPTIONAL_COMPONENTS and library variables to identify & use other driver
-	#else()
+	elseif(IOS AND NOT Vulkan_Layer_VALIDATION)
+		# if building for iOS devices (not iOS Simulator as above) and Vulkan_Layer_VALIDATION is not defined or found, search in the Vulkan SDK
+		find_library(Vulkan_Layer_VALIDATION NAMES VkLayer_khronos_validation HINTS "$ENV{VULKAN_SDK}/lib")
+	else()
 		# if not using standalone driver, retain find_package() results for Vulkan driver, Vulkan loader, and Validation Layer library variables
 		# no need to override with _HPP_VULKAN_LIBRARY in this case since Vulkan DynamicLoader will find/load Vulkan library on macOS & iOS
 	endif()