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/**
 * \file
 * Detect compiler information.
 */

#pragma once

// For _CCCL_IMPLICIT_SYSTEM_HEADER
#include <cuda/__cccl_config>

#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
#  pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
#  pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
#  pragma system_header
#endif // no system header

// enumerate host compilers we know about
#define CUB_HOST_COMPILER_UNKNOWN 0
#define CUB_HOST_COMPILER_MSVC 1
#define CUB_HOST_COMPILER_GCC 2
#define CUB_HOST_COMPILER_CLANG 3

// enumerate device compilers we know about
#define CUB_DEVICE_COMPILER_UNKNOWN 0
#define CUB_DEVICE_COMPILER_MSVC 1
#define CUB_DEVICE_COMPILER_GCC 2
#define CUB_DEVICE_COMPILER_NVCC 3
#define CUB_DEVICE_COMPILER_CLANG 4

// figure out which host compiler we're using
#if defined(_MSC_VER)
#  define CUB_HOST_COMPILER CUB_HOST_COMPILER_MSVC
#  define CUB_MSVC_VERSION _MSC_VER
#  define CUB_MSVC_VERSION_FULL _MSC_FULL_VER
#elif defined(__clang__)
#  define CUB_HOST_COMPILER CUB_HOST_COMPILER_CLANG
#  define CUB_CLANG_VERSION                                                    \
    (__clang_major__ * 10000 + __clang_minor__ * 100 + __clang_patchlevel__)
#elif defined(__GNUC__)
#  define CUB_HOST_COMPILER CUB_HOST_COMPILER_GCC
#  define CUB_GCC_VERSION                                                      \
    (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__)
#else
#  define CUB_HOST_COMPILER CUB_HOST_COMPILER_UNKNOWN
#endif // CUB_HOST_COMPILER

// figure out which device compiler we're using
#if defined(__CUDACC__) || defined(_NVHPC_CUDA)
#  define CUB_DEVICE_COMPILER CUB_DEVICE_COMPILER_NVCC
#elif CUB_HOST_COMPILER == CUB_HOST_COMPILER_MSVC
#  define CUB_DEVICE_COMPILER CUB_DEVICE_COMPILER_MSVC
#elif CUB_HOST_COMPILER == CUB_HOST_COMPILER_GCC
#  define CUB_DEVICE_COMPILER CUB_DEVICE_COMPILER_GCC
#elif CUB_HOST_COMPILER == CUB_HOST_COMPILER_CLANG
// CUDA-capable clang should behave similar to NVCC.
#  if defined(__CUDA__)
#    define CUB_DEVICE_COMPILER CUB_DEVICE_COMPILER_NVCC
#  else
#    define CUB_DEVICE_COMPILER CUB_DEVICE_COMPILER_CLANG
#  endif
#else
#  define CUB_DEVICE_COMPILER CUB_DEVICE_COMPILER_UNKNOWN
#endif
