File xxhash.diff of Package vulkan-validationlayers

From: Jan Engelhardt <jengelh@inai.de>
Date: 2020-08-29 10:10:12.022296526 +0200

Avoid the installation of a custom xxhash.h header. Since vk_*.h header files
still include xxhash.h (and now would source the system xxhash instead of the
bundled one), it makes sense to build ValidationLayers itself with the system
xxhash as well, so that the ABI matches.

---
 layers/CMakeLists.txt      |    2 +-
 layers/utils/hash_util.cpp |    5 +----
 2 files changed, 2 insertions(+), 5 deletions(-)

Index: Vulkan-ValidationLayers-vulkan-sdk-1.3.296.0/layers/CMakeLists.txt
===================================================================
--- Vulkan-ValidationLayers-vulkan-sdk-1.3.296.0.orig/layers/CMakeLists.txt
+++ Vulkan-ValidationLayers-vulkan-sdk-1.3.296.0/layers/CMakeLists.txt
@@ -30,7 +30,6 @@ target_sources(VkLayer_utils PRIVATE
     error_message/error_strings.h
     error_message/record_object.h
     error_message/log_message_type.h
-    external/xxhash.h
     external/inplace_function.h
     ${API_TYPE}/generated/error_location_helper.cpp
     ${API_TYPE}/generated/error_location_helper.h
@@ -75,6 +74,7 @@ target_link_libraries(VkLayer_utils PUBL
     Vulkan::SafeStruct
     Vulkan::UtilityHeaders
     ${CMAKE_DL_LIBS}
+    -lxxhash
 )
 target_include_directories(VkLayer_utils SYSTEM PRIVATE external)
 target_include_directories(VkLayer_utils PUBLIC . ${API_TYPE})
Index: Vulkan-ValidationLayers-vulkan-sdk-1.3.296.0/layers/utils/hash_util.cpp
===================================================================
--- Vulkan-ValidationLayers-vulkan-sdk-1.3.296.0.orig/layers/utils/hash_util.cpp
+++ Vulkan-ValidationLayers-vulkan-sdk-1.3.296.0/layers/utils/hash_util.cpp
@@ -23,12 +23,9 @@
 #define XXH_IMPLEMENTATION
 
 // Only include xxhash.h once!
-#include "external/xxhash.h"
+#include <xxhash.h>
 
 // Currently using version v0.8.2 of xxhash
-static_assert(XXH_VERSION_MAJOR == 0);
-static_assert(XXH_VERSION_MINOR == 8);
-static_assert(XXH_VERSION_RELEASE == 2);
 
 namespace hash_util {