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# check for gcc/clang atomic builtins like __atomic_add_fetch
if(NOT WIN32)
if(NOT DEFINED VTK_HAVE_ATOMIC_BUILTINS)
message(STATUS "Checking for builtin __atomic_add_fetch")
try_compile(VTK_TEST_ATOMIC_BUILTINS_COMPILED
${CMAKE_CURRENT_BINARY_DIR}/CMakeTmp/Sync
${CMAKE_CURRENT_SOURCE_DIR}/vtkTestSyncBuiltins.cxx
OUTPUT_VARIABLE OUTPUT)
if(VTK_TEST_ATOMIC_BUILTINS_COMPILED)
set(vtk_atomic_add_fetch_detection "success")
set(VTK_HAVE_ATOMIC_BUILTINS 1)
else()
set(vtk_atomic_add_fetch_detection "failed")
set(VTK_HAVE_ATOMIC_BUILTINS 0)
endif()
message(STATUS "Checking for builtin __atomic_add_fetch -- ${vtk_atomic_add_fetch_detection}")
set(VTK_HAVE_ATOMIC_BUILTINS ${VTK_HAVE_ATOMIC_BUILTINS}
CACHE INTERNAL "For __atomic_ builtins.")
file(APPEND "${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log"
"Determining if the C++ compiler supports __atomic_add_fetch builtin "
"completed with the following output:\n"
"${OUTPUT}\n")
endif()
endif()
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