--- /dev/null
+From e20a5d13935a41a856e8f71c49f2cc9d81b1d92c Mon Sep 17 00:00:00 2001
+From: Changqing Li <changqing.li@windriver.com>
+Date: Fri, 13 Nov 2020 17:07:00 +0800
+Subject: [PATCH] support link against libatomic if no built-in atomic exist
+
+fix error:
+| framework/lib/ppc/libframework.a(device.cpp.o): in function `std::__atomic_base<unsigned long long>::load(std::memory_order) const':
+| /usr/include/c++/10.2.0/bits/atomic_base.h:426: undefined reference to `__atomic_load_8'
+
+Upstream-Status: Submitted [https://github.com/KhronosGroup/Vulkan-Samples/pull/212]
+
+Signed-off-by: Changqing Li <changqing.li@windriver.com>
+---
+ CMakeLists.txt | 1 +
+ bldsys/cmake/check_atomic.cmake | 62 +++++++++++++++++++++++++++++++++
+ framework/CMakeLists.txt | 4 +++
+ 3 files changed, 67 insertions(+)
+ create mode 100644 bldsys/cmake/check_atomic.cmake
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index e72e829..466f51d 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -42,6 +42,7 @@ endmacro(vulkan_samples_pch)
+ include(utils)
+ include(global_options)
+ include(sample_helper)
++include(check_atomic)
+
+ # Add third party libraries
+ add_subdirectory(third_party)
+diff --git a/bldsys/cmake/check_atomic.cmake b/bldsys/cmake/check_atomic.cmake
+new file mode 100644
+index 0000000..6b47a7a
+--- /dev/null
++++ b/bldsys/cmake/check_atomic.cmake
+@@ -0,0 +1,62 @@
++# check weither need to link atomic library explicitly
++INCLUDE(CheckCXXSourceCompiles)
++INCLUDE(CheckLibraryExists)
++
++if(NOT DEFINED VULKAN_COMPILER_IS_GCC_COMPATIBLE)
++ if(CMAKE_COMPILER_IS_GNUCXX)
++ set(VULKAN_COMPILER_IS_GCC_COMPATIBLE ON)
++ elseif( MSVC )
++ set(VULKAN_COMPILER_IS_GCC_COMPATIBLE OFF)
++ elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang" )
++ set(VULKAN_COMPILER_IS_GCC_COMPATIBLE ON)
++ elseif( "${CMAKE_CXX_COMPILER_ID}" MATCHES "Intel" )
++ set(VULKAN_COMPILER_IS_GCC_COMPATIBLE ON)
++ endif()
++endif()
++
++# Sometimes linking against libatomic is required for atomic ops, if
++# the platform doesn't support lock-free atomics.
++
++function(check_working_cxx_atomics varname)
++ set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
++ set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -std=c++11")
++ CHECK_CXX_SOURCE_COMPILES("
++#include <atomic>
++std::atomic<int> x;
++std::atomic<short> y;
++std::atomic<char> z;
++int main() {
++ ++z;
++ ++y;
++ return ++x;
++}
++" ${varname})
++ set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
++endfunction(check_working_cxx_atomics)
++
++function(check_working_cxx_atomics64 varname)
++ set(OLD_CMAKE_REQUIRED_FLAGS ${CMAKE_REQUIRED_FLAGS})
++ set(CMAKE_REQUIRED_FLAGS "-std=c++11 ${CMAKE_REQUIRED_FLAGS}")
++ CHECK_CXX_SOURCE_COMPILES("
++#include <atomic>
++#include <cstdint>
++std::atomic<uint64_t> x (0);
++int main() {
++ uint64_t i = x.load(std::memory_order_relaxed);
++ (void)i;
++ return 0;
++}
++" ${varname})
++ set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQUIRED_FLAGS})
++endfunction(check_working_cxx_atomics64)
++
++set(NEED_LINK_ATOMIC OFF CACHE BOOL "weither need to link against atomic library")
++if(VULKAN_COMPILER_IS_GCC_COMPATIBLE)
++ # check if non-64-bit atomics work without the library.
++ check_working_cxx_atomics(HAVE_CXX_ATOMICS_WITHOUT_LIB)
++ # check 64-bit atomics work without the library.
++ check_working_cxx_atomics64(HAVE_CXX_ATOMICS64_WITHOUT_LIB)
++ if (NOT HAVE_CXX_ATOMICS_WITHOUT_LIB OR NOT HAVE_CXX_ATOMICS64_WITHOUT_LIB)
++ set(NEED_LINK_ATOMIC ON CACHE BOOL "weither need to link to atomic library" FORCE)
++ endif()
++endif()
+diff --git a/framework/CMakeLists.txt b/framework/CMakeLists.txt
+index bf26786..322526e 100644
+--- a/framework/CMakeLists.txt
++++ b/framework/CMakeLists.txt
+@@ -412,6 +412,10 @@ target_link_libraries(${PROJECT_NAME}
+ ctpl
+ docopt)
+
++if(${NEED_LINK_ATOMIC})
++ target_link_libraries(${PROJECT_NAME} atomic)
++endif()
++
+ # Link platform specific libraries
+ if(ANDROID)
+ target_link_libraries(${PROJECT_NAME} log android native_app_glue)
+--
+2.17.1
+
